2014 Jeep Wrangler JK Factory Service Manual 08 - Electrical

INDICATORS, Instrument Cluster

DESCRIPTION



NOTE:

The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain other components may also reference ESP, ESC or use the traction control ISO symbol.



The instrument cluster assembly has provisions for up to 25 International Control and Display Symbol icon indicators and 4 analog gauges, (Refer to 08 - Electrical/8J - Instrument Cluster/GAUGE PACK, Instrument Cluster - Description) that are all controlled by the Cab Compartment Node (CCN) and standard on all models. Some of the indicators are automatically configured when the CCN is connected to the vehicle's electrical system for compatibility with certain optional equipment or equipment required for regulatory purposes in certain markets. While each instrument cluster may have provisions for indicators to support every available option, the configurable indicators will not function in vehicles that do not have the equipment that an indicator supports.

The instrument cluster includes provisions for the following indicators:

The instrument cluster also includes the following Vacuum Florescent Display (VFD) units:

For more information on the International Control and Display Symbol icons (Refer to 00 - Vehicle Data/Vehicle Information/International Vehicle Control and Display Symbols - Description) .

Each indicator in the instrument cluster, except those located within a VFD unit, is illuminated by a dedicated Light Emitting Diode (LED) that is soldered onto the CCN electronic circuit board. Cluster illumination is accomplished by several dimmable LED units, which illuminate each of the gauge dial faces for visibility when the exterior lighting is turned ON. These LED units as well as the CCN module are serviced only as a complete unit with the instrument cluster and, if damaged or ineffective, the entire instrument cluster assembly must be replaced. The cluster lens and the cluster hood and mask unit are the only components of the instrument cluster assembly that can be serviced separately.

OPERATION

The hard-wired indicator inputs may be diagnosed using conventional diagnostic tools and procedures. However, the CCN circuitry and electronic CAN or LIN data bus message controlled indicators are diagnosed using the self-diagnostic CCN Self test. (Refer to 08 - Electrical/8J - Instrument Cluster - Diagnosis and Testing) . For proper testing of the CAN or LIN data bus and the electronic data bus message inputs to the CCN that control each indicator requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.


INDICATORS

Indicators are located in various positions within the instrument cluster and are all connected to the Cab Compartment Node (CCN) electronic circuit board. All the indicators are completely controlled by the CCN microprocessor. The various indicators are controlled by different strategies; some receive fused ignition switch output from the CCN circuitry and have a switched ground, while others are grounded through the CCN circuitry and have a switched battery feed. However, most are controlled by Controller Area Network (CAN) or Local Interface Network (LIN) data bus messages from other electronic modules in the vehicle but some are controlled by a combination of hard-wired inputs, electronic messaging and CCN programming. If the CCN loses CAN data bus communication, the CCN circuitry will automatically turn ON the Malfunction Indicator Lamp (MIL) until CAN data bus communication is restored.

The blue/green indicators located within the Vacuum Florescent Display (VFD) unit will dim accordingly with the instrument panel dimming. The red indicators within the VFD are at a fixed intensity. The cruise and 4WD indicators located within the odometer VFD unit are dimmable. All other indicators are illuminated at a fixed intensity, which is not affected by the selected illumination intensity of the instrument cluster general illumination Light Emitting Diode (LED) units. The illumination intensity of the dimmable indicators is synchronized with that of the general illumination lighting.

In addition, certain indicators in this instrument cluster are automatically or self-configured. This feature allows the configurable indicators to be enabled by the CCN circuitry for compatibility with certain optional equipment. These indicators are enabled or disabled by an electronic configuration message sent to the CCN by the Totally Integrated Power Module (TIPM). The TIPM defaults for the Anti-lock Brake System (ABS), and the airbag indicator's are enabled, and these configuration settings must be programmatically disabled in the TIPM using a diagnostic scan tool for vehicles that do not have this equipment. The automatically or self-configured indicators remain latent in each CCN at all times and will be active only when the CCN receives the appropriate CAN or LIN bus message inputs for that optional system or equipment.

Below are brief explanations of the indicators available on this vehicle. More detailed information may be available elsewhere in this manual under the module or system sections that control or influence the illumination of an indicator located within the instrument cluster or the VFD display's. For information on diagnosis and testing of the indicators (Refer to 08 - Electrical/8J - Instrument Cluster - Diagnosis and Testing) . The indicators, VFD displays as well as the gauges are only serviceable with the instrument cluster as an assembly. The cluster lens and hood and mask assembly are the only components serviceable separate of the instrument cluster.


ABS INDICATOR

The ABS indicator gives an indication to the vehicle operator when the ABS system is faulty or inoperative. This indicator is controlled by a low side driver on the CCN circuit board based upon programming and electronic messages received by the CCN from the Controller Antilock Brake (CAB) over the Controller Area Network (CAN) data bus. The CCN will illuminate the ABS indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The ABS indicator Light Emitting Diode (LED) is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also illuminate the ABS indicator for the following reasons:

The CAB continually monitors the ABS circuits and sensors to decide whether the system is in good operating condition. The CAB then sends the proper lamp-on or lamp-off messages to the CCN. If the CAB sends a lamp-on message after the bulb test, it indicates that the CAB has detected a system malfunction and/or that the ABS system has become inoperative. The CAB will store a Diagnostic Trouble Code (DTC) for any malfunction it detects. Each time the ABS indicator fails to light due to an open or short in the cluster ABS indicator circuit, the cluster sends a message notifying the CAB of the condition, then the instrument cluster and the CAB will each store a DTC.


AIRBAG INDICATOR

The airbag indicator gives an indication to the vehicle operator when the airbag system is faulty or inoperative. The airbag indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the Occupant Restraint Controller (ORC) over the CAN data bus. Based on messages received from the ORC, the CCN will illuminate the airbag indicator for about six seconds each time the ignition is turned to the ON position, during the bulb test.

The airbag indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also illuminate the airbag indicator for the following reasons:

The ORC continually monitors the airbag system circuits and sensors to decide whether the system is in good operating condition. The ORC then sends the proper lamp-on or lamp-off messages to the CCN. If the ORC sends a lamp-on message after the bulb test, it indicates that the ORC has detected a system malfunction and/or that the airbags and seat belt tensioners may not deploy when required, or may deploy when not required. The ORC will store a DTC for any malfunction it detects. Each time the airbag indicator fails to illuminate due to an open or short in the CCN airbag indicator circuit, the CCN sends a message notifying the ORC of the condition, the CCN and the ORC will each store a DTC, and the seat belt indicator will flash on and off as a backup to notify the vehicle operator.


AXLE LOCK INDICATORS

The axle lock indicators gives an indication to the vehicle operator when the locking mechanism in the front or rear axles, if equipped with the optional off-road package are engaged. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the Totally Integrated Power Module (TIPM) over the CAN data bus

The front axle lock indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The CCN will illuminate either the front axle or rear lock indicators for the following reasons:

The TIPM continually monitors an input from the front axle lock solenoid to determine the status of the front axle lock mechanism. The TIPM then sends the proper lamp-ON or lamp-OFF message to the CCN.


BRAKE/PARK BRAKE INDICATOR

The brake indicator gives an indication to the vehicle operator when the parking brake is applied, when there are certain brake hydraulic system malfunctions as indicated by a low brake hydraulic fluid level condition, or when the brake fluid level switch is disconnected. The brake indicator can also give an indication when certain faults are detected in the ABS. This indicator is controlled by a transistor on the CCN circuit board based upon programming, electronic messages received from the CAB over the CAN data bus, and a hard-wired input from the park brake switch. The CCN will illuminate the brake indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The brake indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also illuminate the brake indicator for the following reasons:

The park brake switch on the park brake pedal mechanism provides a hard-wired ground input to the CCN circuitry through the park brake switch sense circuit whenever the park brake is applied or not fully released. The CAB continually monitors the ABS system circuits and sensors, including the brake fluid level switch on the brake master cylinder reservoir, to decide whether the system is in good operating condition. The CAB then sends the proper lamp-on or lamp-off messages to the CCN. If the CAB sends a lamp-on message after the bulb test, it indicates that the CAB has detected a brake hydraulic system malfunction and/or that the ABS system has become inoperative. The CAB will store a DTC for any malfunction it detects.


CHANGE OIL INDICATOR

The change oil indicator gives an indication to the vehicle operator when a duty-cycle algorithm contained within the software of the Powertrain Control Module (PCM) determines that a recommended oil change interval has been attained. This indicator is controlled by the CCN logic circuit based upon programming and electronic messages received from the PCM over the CAN data bus.

The change oil indicator function of the VFD is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the VFD change oil indication will always be OFF when the ignition switch is in any position except ON or START. The CCN will illuminate the change oil indicator for the following reasons:

The PCM continually monitors numerous sensor inputs to determine the duty-cycles to which the engine is being subjected. A pre-programmed algorithm within the PCM then determines when to send the proper lamp-ON or lamp-OFF message to the CCN.


CHARGING INDICATOR

The charging indicator gives an indication to the vehicle operator when the electrical system voltage is too low or too high. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received Powertrain Control Module (PCM) over the CAN data bus. The CCN will illuminate the charge indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The charging indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also turn on the charging indicator for the following reasons:

The PCM continually monitors the electrical system voltage to control the generator output. The PCM then sends the proper system voltage messages to the CCN. If the charging indicator is turned on due to a charge fail or voltage high condition, it may indicate that the charging system requires service.


CRUISE INDICATOR

The cruise indicator gives an indication to the vehicle operator when the speed control system is ON, regardless of whether the speed control is engaged. This indicator is controlled by the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus.

The cruise indicator is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the indicator will always be OFF when the ignition switch is in any position except ON or START. The indicator only illuminates when it is energized by the instrument cluster logic circuit. The instrument cluster will illuminate the cruise indicator for the following reasons:

The PCM continually monitors the speed control switches to determine the appropriate outputs to control the vehicle speed. The PCM then sends the proper lamp-ON or lamp-OFF message to the CCN.


DOOR AJAR INDICATOR

The ajar indicators give an indication to the vehicle operator that one or more of the passenger compartment doors or the swing gate may be open or not completely latched. These indicators are controlled by the CCN logic circuit based upon programming and electronic ajar switch status messages from the TIPM over the CAN data bus.

The ajar indicator function of the odometer VFD unit is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the VFD ajar indications can occur regardless of the ignition switch position. The CCN will turn On the ajar indicator for the following reasons:

The TIPM continually monitors the door and swing gate ajar switches to determine the status of the doors and swing gate. The TIPM then sends the proper ajar switch status messages to the CCN. The door and swing gate ajar switches and their circuits may be diagnosed using conventional diagnostic tools and methods. Refer to the appropriate wiring information.


ELECTRONIC THROTTLE CONTROL INDICATOR

The Electronic Throttle Control (ETC) indicator gives an indication to the vehicle operator when the ETC system is faulty or inoperative. The ETC indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus. The CCN will illuminate the ETC indicator for about fifteen seconds each time the ignition is turned to the ON position, during the bulb test.

The ETC indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also turn on the ETC indicator for the following reasons:

The PCM continually monitors the ETC system circuits and sensors to decide whether the system is in good operating condition. The PCM then sends the proper lamp-on or lamp-off messages to the CCN. If the PCM sends a lamp-on message after the bulb test, it indicates that the PCM has detected an ETC system malfunction and/or that the ETC system is inoperative. The PCM will store a DTC for any malfunction it detects. Each time the ETC indicator fails to illuminate due to an open or short in the CCN ETC indicator circuit, the CCN sends a message notifying the PCM of the condition and the CCN and the PCM will each store a DTC.


ENGINE TEMPERATURE INDICATOR

The engine temperature indicator gives an indication to the vehicle operator when the engine temperature gauge reading reflects a condition requiring immediate attention. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus. The CCN will illuminate the engine temperature indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The engine temperature indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The engine temperature indicator will also be turned on for the following reasons:

The PCM continually monitors the engine coolant temperature sensor to determine the engine operating temperature. The PCM then sends the proper engine coolant temperature messages to the CCN. If the CCN turns on the engine temperature indicator due to a high engine temperature gauge reading, it may indicate that the engine or the engine cooling system requires service.


ESP/BAS INDICATOR

The ESP/BAS indicator gives an indication to the vehicle operator when the Electronic Stability Program (ESP)/Brake Assist System (BAS) has been activated. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the Controller Antilock Brake (CAB) and the All-Wheel Drive Control Module (AWDCM) over the CAN data bus. The CCN will illuminate the ESP/BAS indicator for about tfour seconds each time the ignition is turned to the ON position, during the bulb test.

The ESP/BAS indicator LED is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The CCN will illuminate the ESP/BAS indicator for the following reasons:

The CAB continually monitors the ESP/BAS circuits and sensors to decide whether the system is in good operating condition and the proper outputs to the components of the system. The CAB then sends the proper lamp-ON or lamp-OFF message to the CCN.

For proper diagnosis of the ESP/BAS system, the CAB, the AWDCM, the CCN the CAN data bus or the electronic communication related to the ESP/BAS indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.


FOG LAMP INDICATOR

The fog lamp indicator gives an indication to the vehicle operator whenever the optional fog lamps are illuminated. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages from the Total Integrated Power Module (TIPM) over the CAN data bus.

The fog lamp indicator LED is completely controlled by the CCN logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn on the fog lamp indicator for the following reasons:

The CCN continually monitors a hard-wired input from the headlamp switch to determine the selected fog lamp switch status. The CCN then sends the proper fog lamp-on and lamp-off messages to the TIPM over the CAN data bus. The TIPM activates the fog lamp relay then sends the proper fog lamp indicator lamp-on and lamp-off messages to the CCN.


FUEL SAVER INDICATOR - ECONOMIZER (ECO / ECO-ON)

The ECO / ECO-on message will display in the odometer display. The message will appear whenever the vehicle is driven in a fuel efficient manner, if the feature is turned ON by pressing the odometer push-button and toggling through the menu.

This feature allows the vehicle operator to monitor when they are driving in a fuel efficient manner, and it can be used to modify driving habits in order to increase fuel economy.


4WD INDICATOR

The four-wheel drive indicator gives an indication to the vehicle operator when a four-wheel drive (4WD) mode of the transfer case is selected. This indicator is controlled either by the CCN circuit board (domestic market vehicles) or by a transistor on the circuit board (export market vehicles) based upon programming and electronic messages received from the TIPM over the CAN data bus.

The four-wheel drive indicator is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the indicator will always be OFF when the ignition switch is in any position except ON or START. The indicator only illuminates when it is energized by the CCN logic circuit. The CCN will illuminate the four-wheel drive indicator for the following reasons:

The TIPM continually monitors inputs from the four-wheel drive switch to determine the status of the transfer case. The TIPM then sends the proper lamp-ON or lamp-OFF message to the CCN.


GAS CAP INDICATOR

The gas cap indicator gives an indication to the vehicle operator when there is a gross leak detected in the on-board fuel vapor recovery system. This indicator is controlled by the CCN logic circuit based upon programming and electronic messages received from the PCM over the CAN data bus.

The gas cap indicator function of the odometer VFD unit is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the odometer VFD gas cap indication will always be OFF when the ignition switch is in any position except ON or START. The CCN will illuminate the gas cap indicator for the following reasons:

The PCM continually monitors the on board vapor recovery system to determine whether there are air leaks in the system. The PCM then sends the proper lamp-ON or lamp-OFF message to the CCN. If the CCN illuminates the gas cap indicator due to a monitored gross leak in the vapor recovery system, it may indicate that the gas cap has been removed or is improperly installed.


HIGH BEAM INDICATOR

The high beam indicator gives an indication to the vehicle operator whenever the headlamp high beams are illuminated. The TIPM sends a data Bus message for high beam indicator illumination, in turn the CCN takes this data Bus message directive to turn on the indicator.

The high beam indicator LED is completely controlled by the CCN logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn on the high beam indicator for the following reasons:

The CCN continually monitors the headlamp switch and the multi-function switch to determine the proper headlamp low beam and high beam control. The CCN then sends the proper low beam and high beam lamp-on and lamp-off messages to the TIPM over the CAN data bus and turns the high beam indicator on or off accordingly.


LOW FUEL INDICATOR

The low fuel indicator gives an indication to the vehicle operator when the level of fuel in the fuel tank becomes low. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic fuel level messages received from the TIPM over the CAN data bus. The CCN will illuminate the low fuel indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test

The low fuel indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will illuminate the low fuel indicator for the following reasons:

The TIPM continually monitors the fuel tank sending unit to determine the level of fuel in the fuel tank. The TIPM then sends the proper electronic fuel level message to the CCN and other electronic modules in the vehicle over the CAN data bus. The TIPM will store a Diagnostic Trouble Code (DTC) for any fault detected in the fuel level sense circuit.


LOW OIL PRESSURE INDICATOR

The low oil pressure indicator gives an indication to the vehicle operator when the engine oil pressure reading reflects a condition requiring immediate attention. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus.

The low oil pressure indicator LED is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn on the low oil pressure indicator for the following reasons:

The PCM continually monitors the engine oil pressure sensor to determine the engine oil pressure. The PCM then sends the proper engine oil pressure messages to the CCN.


LOW TIRE PRESSURE INDICATOR

The Tire Pressure Monitor (TPM) indicator gives an indication to the vehicle operator of the status of the TPM system. The TPM indicator is controlled by the CCN circuit board based upon programming and electronic messages received from the Wireless Control Module (WCM) over the CAN data bus. The CCN will illuminate the TPM indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test

The TPM indicator is completely controlled by the CCN's instrument cluster logic circuit, that logic only allow's this indicator to operate when the CCN receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the indicator will always be OFF when the ignition switch is in any position except ON or START. The indicator only illuminates when it is energized by the instrument cluster logic circuit. The CCN will illuminate the TPM indicator for the following reasons:


MALFUNCTION INDICATOR LAMP

The Malfunction Indicator Lamp (MIL) gives an indication to the vehicle operator when the PCM has recorded a DTC for an ON-Board Diagnostics II (OBDII) emissions-related circuit or component malfunction. The MIL is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus. The CCN will illuminate the MIL indicator for about fifteen seconds each time the ignition is turned to the ON position, during the bulb test.

The MIL LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also turn on the MIL for the following reasons:

The PCM continually monitors the fuel and emissions system circuits and sensors to decide whether the system is in good operating condition. The PCM then sends the proper lamp-on or lamp-off messages to the CCN. If the CCN turns on the MIL after the bulb test, it may indicate that a malfunction has occurred and that the fuel and emissions systems may require service.


OVERDRIVE OFF INDICATOR

The overdrive off indicator gives an indication to the vehicle operator when the electronically controlled overdrive feature of the automatic transmission has been disabled. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus.

The overdrive off indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will illuminate the overdrive off indicator for the following reasons:

The PCM continually monitors the overdrive switch to determine the proper outputs to the automatic transmission. The PCM then sends the proper lamp-ON or lamp-OFF message to the CCN.


REAR FOG LAMP INDICATOR

The rear fog lamp indicator gives an indication to the vehicle operator whenever the rear fog lamps are illuminated. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the TIPM over the CAN data bus.

The rear fog lamp indicator LED is completely controlled by the CCN logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn ON the rear fog lamp indicator for the following reasons:

The TIPM continually monitors electronic exterior lighting request messages from the CCN to determine the appropriate outputs to the rear fog lamps. The TIPM activates or deactivates the rear fog lamps then sends the proper lamp-ON or lamp-OFF message back to the CCN.


SEAT BELT INDICATOR

The seat belt indicator gives an indication to the vehicle operator of the status of the driver side front seat belt. This indicator is controlled by a transistor on the CCN circuit board based upon cluster programming and a hard-wired input from the seat belt switch in the driver side front seat belt retractor through the seat belt indicator driver circuit.

The seat belt indicator also includes a programmable enhanced seat belt reminder or “beltminder” feature that is enabled when the vehicle is shipped from the factory. This beltminder feature can be disabled and enabled by the customer using a specific programming event sequence, or by the dealer using a diagnostic scan tool.

The seat belt indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn on the seat belt indicator for the following reasons:

The seat belt switch is connected in series between ground and the seat belt indicator driver input to the instrument cluster. The seat belt switch input to the instrument cluster circuitry may be diagnosed using conventional diagnostic tools and methods. Refer to the appropriate wiring information.


SECURITY INDICATOR

The security indicator gives an indication to the vehicle operator when the Vehicle Theft Security System (VTSS) is arming or is armed. ON models equipped with the Sentry Key Immobilizer System (SKIS), the security indicator also gives an indication to the vehicle operator of the status of the SKIS. This indicator is controlled by a transistor on the CCN circuit board based upon programming, hard-wired inputs to the CCN from the various security system components, electronic messages received from the WIN over the CAN data bus. The CCN will illuminate the security indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The security indicator LED is completely controlled by the CCN logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also turn on the security indicator for the following reasons:

The CCN circuitry controls the security indicator whenever the ignition switch is in the OFF position and the VTSS is arming, armed, or alarming. Whenever the ignition switch is in the ON or START positions, the WIN performs a self-test to decide whether the SKIS is in good operating condition and whether a valid key is present in the ignition lock cylinder. The WIN then sends the proper lamp-on or lamp-off messages to the CCN. If the instrument cluster flashes the security indicator upon ignition ON, or turns on the security indicator solid after the bulb test, it indicates that a SKIS malfunction has occurred or that the SKIS is inoperative.


SWAY BAR DISCONNECT INDICATOR

The front sway bar disconnect indicator gives an indication to the vehicle operator when the locking mechanism of the front sway bar of vehicles equipped with the optional off-road package is disengaged. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the TIPM over the CAN data bus

The front sway bar disconnect indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the instrument cluster transistor. The CCN will illuminate the front sway bar disconnect indicator for the following reasons:

The TIPM continually monitors an input from the front sway bar disconnect solenoid to determine the status of the front sway bar disconnect mechanism. The TIPM then sends the proper lamp-ON or lamp-OFF message to the CCN.


TRACTION CONTROL INDICATOR

The traction control indicator gives an indication to the vehicle operator when the electronic Traction Control System (TCS) has been activated. This indicator is controlled by the CCN circuit board based upon programming and electronic messages received from the CAB over the CAN data bus. The CCN will illuminate the traction control indicator for about four seconds each time the ignition is turned to the ON position, during the bulb test.

The traction control indicator is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the indicator will always be off when the ignition switch is in any position except ON or START. The indicator only illuminates when it is switched to ground by the instrument cluster circuitry. The instrument cluster will turn on the traction control indicator for the following reasons:

The CAB continually monitors the traction control switch to determine the proper outputs to the components of the ABS. The CAB then sends the proper traction control lamp-on and lamp-OFF messages to the CCN.


TRANSMISSION RANGE INDICATOR

The electronic gear selector indicator gives an indication to the vehicle operator of the transmission gear that has been selected with the automatic transmission gear selector lever. This indicator is controlled by the instrument cluster circuit board based upon cluster programming and electronic messages received from the Powertrain Control Module (PCM) over the Controller Area Network (CAN) data bus.

The gear selector indicator information is displayed by the odometer Vacuum Fluorescent Display (VFD) unit soldered onto the instrument cluster electronic circuit board, and the VFD will not display the gear selector indicator information after the ignition switch is turned to the OFF position. Each time the cluster is disconnected from battery current for more than about five minutes, it must configure itself for the automatic transmission type that is in the vehicle once it is reconnected to battery current. The instrument cluster circuitry operates the gear selector indicator to provide the following features:

The PCM continually monitors a hard-wired multiplex input from the Transmission Range Sensor (TRS), then sends the proper message to the CCN.


TURN SIGNAL INDICATORS

The turn signal indicators give an indication to the vehicle operator that the turn signal (left or right indicator flashing) or hazard warning (both left and right indicators flashing) have been selected and are operating. These indicators are controlled by transistors on the CCN electronic circuit board based upon the cluster programming, a hard-wired multiplex input received by the cluster from the turn signal and hazard warning switch circuitry of the multi-function switch on the turn/hazard switch mux circuit, and electronic messages received from the TIPM over the CAN data bus.

Each turn signal indicator LED is completely controlled by the CCN logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, each LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn on the turn signal indicators for the following reasons:

The CCN continually monitors the multi-function switch and electronic messages from the TIPM to determine the proper turn signal and hazard warning system control.


WAIT-TO-START INDICATOR

The wait-to-start indicator gives an indication to the vehicle operator when the diesel engine is too cool for efficient and reliable engine starting, and the engine glow plugs are energized in their pre-heat operating mode. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus.

The wait-to-start indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will illuminate the wait-to-start indicator for the following reasons:

The PCM continually monitors the glow plug control circuits to determine when they are energized in their pre-heat operating mode. The PCM then sends the proper lamp-ON or lamp-OFF message to the CCN.


WATER IN FUEL INDICATOR

The water-in-fuel indicator gives an indication to the vehicle operator when there is excessive water detected in the diesel fuel. This indicator is controlled by the CCN based upon programming and electronic messages received from the PCM over the CAN data bus.

The water-in-fuel indicator LED is completely controlled by the cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will illuminate the water-in-fuel indicator for the following reasons:

The PCM continually monitors the water-in-fuel sensor to determine whether there is excessive water in the diesel fuel system. The PCM then sends the proper electronic water-in-fuel message to the CCN.