2007 Commander XK Factory Service Manual 8 - ELECTRICAL

DIAGNOSIS AND TESTING

B1841-SUNROOF OPEN SWITCH INPUT CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The Sunroof Motor/Module supplies a 12 volt supply circuit to the sunroof switch. When the switch is closed to any of the 3 sense circuits (open, close or vent), it sends that command back to the module.


  • When Monitored:

    Whenever the Sunroof module is awake.

  • Set Condition:

    Whenever the module has determined that the open switch has been applied for over 15 seconds or there is a short to voltage on the Sunroof Open Switch Sense circuit, this code will set.


Possible Causes
  
(Q3) SUNROOF OPEN SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
  
(Q3) SUNROOF OPEN SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT
  
SUNROOF SWITCH SHORTED
  
SUNROOF MOTOR/MODULE
  



Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.
With the scan tool, record and erase DTC's
Press and release the Sunroof Switch in all positions several times.
Wait 30 seconds.
With the scan tool, read DTC's.

Does the scan tool display B1841–SUNROOF OPEN SWITCH INPUT CIRCUIT HIGH?

Yes


No

2. SUNROOF SWITCH SHORTED



With the scan tool, erase DTC's.
Turn the ignition off.
Disconnect the Sunroof Switch connector.
Turn the ignition on and wait 30 seconds.
With the scan tool, read DTC's.

Does the scan tool display B1841–SUNROOF OPEN SWITCH INPUT CIRCUIT HIGH?

Yes


No

3. (Q3) SUNROOF OPEN SWITCH SENSE CIRCUIT SHORT TO VOLTAGE


NOTE: To further diagnose the sunroof, it is necessary to lower or remove the headliner.


Turn the ignition off.
Lower the headliner to gain access to the Sunroof Motor/Module connector.
Disconnect the Sunroof Motor/Module connector.

NOTE: Ensure the A-Pillar connector is connected before proceeding.


Turn the ignition on.
Measure the voltage between the (Q3) Sunroof Open Switch Sense circuit and Ground.

Is the voltage above 0.4 volts?

Yes


No

4. (Q3) SUNROOF OPEN SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT



Turn the ignition off.
Disconnect the A-Pillar connector.
Measure the resistance between the (Q3) Sunroof Open Switch Sense circuit and the (Q6) Sunroof Switch Supply circuit in the Sunroof Motor/Module connector.

Is the resistance below 1000.0 ohms?

Yes


No

B1844-SUNROOF CLOSE SWITCH INPUT CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The Sunroof Motor/Module supplies a 12 volt supply circuit to the sunroof switch. When the switch is closed to any of the 3 sense circuits (open, close or vent), it sends that command back to the module.


  • When Monitored:

    Whenever the Sunroof module is awake.

  • Set Condition:

    Whenever the module has determined that the close switch has been applied for over 15 seconds or there is a short to voltage on the Sunroof Close Switch Sense circuit, this code will set.


Possible Causes
  
(Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
  
(Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT
  
SUNROOF SWITCH SHORTED
  
SUNROOF MOTOR/MODULE
  



Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.
With the scan tool, record and erase DTC's
Press and release the Sunroof Switch in all positions several times.
Wait 30 seconds.
With the scan tool, read DTC's.

Does the scan tool display B1844–SUNROOF CLOSE SWITCH INPUT CIRCUIT HIGH?

Yes


No

2. SUNROOF SWITCH SHORTED



With the scan tool, erase DTC's.
Turn the ignition off.
Disconnect the Sunroof Switch connector.
Turn the ignition on and wait 30 seconds.
With the scan tool, read DTC's.

Does the scan tool display B1844–SUNROOF CLOSE SWITCH INPUT CIRCUIT HIGH?

Yes


No

3. (Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE


NOTE: To further diagnose the sunroof, it is necessary to lower or remove the headliner.


Turn the ignition off.
Lower the headliner to gain access to the Sunroof Motor/Module connector.
Disconnect the Sunroof Motor/Module connector.

NOTE: Ensure the A-Pillar connector is connected before proceeding.


Turn the ignition on.
Measure the voltage between the (Q5) Sunroof Close Switch Sense circuit and Ground.

Is the voltage above 0.4 volts?

Yes


No

4. (Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT



Turn the ignition off.
Disconnect the A-Pillar connector.
Measure the resistance between the (Q5) Sunroof Close Switch Sense circuit and the (Q6) Sunroof Switch Supply circuit in the Sunroof Motor/Module connector.

Is the resistance below 1000.0 ohms?

Yes


No

B1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The Sunroof Motor/Module supplies a 12 volt supply circuit to the sunroof switch. When the switch is closed to any of the 3 sense circuits (open, close or vent), it sends that command back to the module.


  • When Monitored:

    Whenever the Sunroof module is awake.

  • Set Condition:

    Whenever the module has determined that the vent switch has been applied for over 15 seconds or there is a short to voltage on the Sunroof Vent Switch Sense circuit, this code will set.


Possible Causes
  
(Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
  
(Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT
  
SUNROOF SWITCH SHORTED
  
SUNROOF MOTOR/MODULE
  



Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.
With the scan tool, record and erase DTC's
Press and release the Sunroof Switch in all positions several times.
Wait 30 seconds.
With the scan tool, read DTC's.

Does the scan tool display B1847–SUNROOF VENT SWITCH INPUT CIRCUIT HIGH?

Yes


No

2. SUNROOF SWITCH SHORTED



With the scan tool, erase DTC's.
Turn the ignition off.
Disconnect the Sunroof Switch connector.
Turn the ignition on and wait 30 seconds.
With the scan tool, read DTC's.

Does the scan tool display B1847–SUNROOF VENT SWITCH INPUT CIRCUIT HIGH?

Yes


No

3. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO VOLTAGE


NOTE: To further diagnose the sunroof, it is necessary to lower or remove the headliner.


Turn the ignition off.
Lower the headliner to gain access to the Sunroof Motor/Module connector.
Disconnect the Sunroof Motor/Module connector.

NOTE: Ensure the A-Pillar connector is connected before proceeding.


Turn the ignition on.
Measure the voltage between the (Q4) Sunroof Vent Switch Sense circuit and Ground.

Is the voltage above 0.4 volts?

Yes


No

4. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT



Turn the ignition off.
Disconnect the A-Pillar connector.
Measure the resistance between the (Q4) Sunroof Vent Switch Sense circuit and the (Q6) Sunroof Switch Supply circuit in the Sunroof Motor/Module connector.

Is the resistance below 1000.0 ohms?

Yes


No

B2227-SUNROOF ECU INTERNAL

For a complete wiring diagram Refer to Section 8W.



Possible Causes
  
SUNROOF MOTOR/MODULE
  



Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.
With the scan tool, record and erase DTC's
Operate the Sunroof Switch in all positions several times.
Wait 30 seconds.
With the scan tool, read DTC's.

Does the scan tool display B2227–SUNROOF ECU INTERNAL?

Yes


No

U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE

For a complete wiring diagram Refer to Section 8W.


(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic test procedure.

U0155-LOST COMMUNICATION WITH CLUSTER/CCN

For a complete wiring diagram Refer to Section 8W.


(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic test procedure.

U0019-CAN B BUS





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    Continuously

  • Set Condition:

    Whenever the CAN B Bus (+) or CAN B Bus (-) circuit is open, shorted to voltage or shorted to ground.


Possible Causes
  
CAN B BUS DTC's IN FRONT CONTROL MODULE
  
(D55) CAN B BUS (+) CIRCUIT OPEN
  
(D54) CAN B BUS (-) CIRCUIT OPEN
  
SUNROOF MOTOR/MODULE
  



Diagnostic Test

1. CHECK FOR ACTIVE DTCS

With the scan tool, read the active DTC's.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
Turn the ignition off and wait 30 seconds.
Turn the ignition on.
With the scan tool, read the active DTC's.

Does the scan tool display this DTC as active?

Yes


No

2. CHECK FRONT CONTROL MODULE DTC's

With the scan tool, read Front Control Module active DTC's

Does the scan tool display any CAN B BUS DTC's – ACTIVE?

Yes


No

3. (D55) CAN B BUS (+) CIRCUIT OPEN



Turn the ignition off.
Disconnect the negative battery cable.
Disconnect the Sunroof Motor/Module connector.
Disconnect the Front Control Module C1 connector.
Measure the resistance of the (D55) CAN B Bus (+) circuit between the Front Control Module C1 connector and the Sunroof Motor/Module connector.

Is the resistance below 2.0 ohms?

Yes


No

4. (D54) CAN B BUS (–) CIRCUIT OPEN



Measure the resistance of the (D54) CAN B Bus (–) circuit between the Front Control Module C1 connector and the Sunroof Motor/Module connector.

Is the resistance below 2.0 ohms?

Yes


No

B210D-BATTERY VOLTAGE LOW - SUNROOF

For a complete wiring diagram Refer to Section 8W.



POSSIBLE CAUSES
  
LOW VOLTAGE ENGINE DTC
  
(A932) FUSED B(+) CIRCUIT RESISTED
  
SUNROOF MOTOR/MODULE
  



Diagnostic Test

1. CHECK ENGINE DTC's

NOTE: Ensure the battery is fully charged before proceeding.


With the scan tool, read ENGINE DTC's

Are there any ENGINE BATTERY OR CHARGING SYSTEM DTC's present?

No


Yes

2. TEST FOR INTERMITTENT CONDITION

With the scan tool, record and erase DTC's
Start the engine and run for 2 minutes.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTC's.

Does the scan tool display BATTERY VOLTAGE LOW in the Sunroof module only?

Yes


No

3. (A932) FUSED B(+) CIRCUIT RESISTED



Turn the ignition off.
Lower the headliner and disconnect the Sunroof Motor/Module connector.
Test for a resisted (A932) Fused B(+) circuit by connecting a 12-volt test light between the (A932) Fused B(+) circuit and the (Z914) Ground circuit in the Sunroof Motor/Module connector. The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes


No

B210E-BATTERY VOLTAGE HIGH

For a complete wiring diagram Refer to Section 8W.



POSSIBLE CAUSES
  
HIGH VOLTAGE ENGINE DTC
  
SUNROOF MOTOR/ MODULE
  



Diagnostic Test

1. CHECK ENGINE DTC's

With the scan tool, read ENGINE DTC's

Are there any ENGINE DTC's present?

No


Yes

2. TEST FOR INTERMITTENT CONDITION

With the scan tool, record and erase DTC's
Start the engine and run for two minutes.
Cycle the ignition from on to off three times.
Turn the ignition on.
With the scan tool, read DTC's.

Does the scan tool display BATTERY VOLTAGE HIGH in this module only?

Yes


No