B1600-12-LEFT SOLAR SENSOR - CIRCUIT SHORT TO BATTERY
B1600-12-LEFT SOLAR SENSOR - CIRCUIT SHORT TO BATTERY
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For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The HVAC A/C heater control uses a variety of sensors to adjust HVAC operation to obtain optimal performance. These sensors are continuously monitored by the A/C heater control to assure that they are in range. An active Diagnostic trouble Code (DTC) indicates that a sensor is out of range. A stored DTC indicates that the sensor was out of range but is currently within range.
A sun sensor is not a thermistor type sensor but is more accurately a photo diode. For this reason the sun sensor responds to sun light intensity rather than temperature. The sun sensor converts sunlight intensity to an electrical voltage which provides data to the A/C heater control to help determine proper mode and blend door positions and blower motor speeds. The sun sensor assembly is also used to sense day and night conditions for automatic headlight control if equipped.
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When Monitored:
With the ignition on.
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Set Condition:
If the A/C Heater Control detects on the Sun Sensor 1 Signal circuit input voltage is greater than 4.8 volts for the period of two seconds or more. This DTC has a de-maturing time of 20 ms. If the DTCs status changes from active to stored, the DTC will stay in memory for 100 ignition cycles.
Possible Causes |
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| (G39) SUN SENSOR 1 SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (G39) SUN SENSOR 1 SIGNAL CIRCUIT OPEN |
| (C121) SENSOR GROUND CIRCUIT OPEN |
| SUN SENSOR |
| A/C HEATER CONTROL |
Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, read HVAC DTCs. |
Is this DTC active?
Yes
- Go To 2
No
- Go To 6
2. CHECK THE (G39) SUN SENSOR 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
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| 1. | Turn the ignition off to the lock position. |
| 2. | Disconnect the Sun Sensor harness connector. |
| 3. | Disconnect the A/C Heater Control harness connector. |
| NOTE: | Check connectors - Clean/repair as necessary. |
| 4. | Ignition on, engine not running. |
| 5. | Check the voltage of the (G39) Sun Sensor 1 Signal circuit. |
Is there any voltage present?
Yes
- Repair the (G39) Sun Sensor 1 Signal circuit for an short to voltage.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
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Go To 3
3. CHECK THE (G39) SUN SENSOR 1 SIGNAL CIRCUIT FOR AN OPEN
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| 1. | Turn the ignition off to the lock position. |
| 2. | Measure the resistance of the (G39) Sun Sensor 1 Signal circuit between the A/C Heater Control harness connector and the Sun Sensor harness connector. |
Is the resistance above 5.0 Ohms?
Yes
- Repair the (G39) Sun Sensor 1 Signal circuit for an open.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
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Go To 4
4. CHECK THE (C121) SENSOR GROUND CIRCUIT FOR AN OPEN
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| 1. | Measure the resistance of the (C121) Sensor Ground circuit between the A/C Heater Control C1 harness connector and the Sun Sensor harness connector. |
Is the resistance above 5.0 Ohms?
Yes
- Repair the (C121) Sensor Ground circuit for an open.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
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Go To 5
5. CHECK THE SUN SENSOR AND A/C HEATER CONTROL
| 1. | Turn the ignition off to the lock position. |
| 2. | Replace the Sun Sensor in accordance with the Service Information. (Refer to 24 - Heating and Air Conditioning/Controls/SENSOR, Sun - Removal) . |
| 3. | Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) . |
Did the DTC reset during or after the HVAC Verification Test?
Yes
- Replace and program the A/C Heater Control in accordance with the Service Information. (Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal) .
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
6. CHECK THE WIRING AND CONNECTORS
| 1. | The conditions necessary to set the DTC are not present at this time. |
| 2. | Using the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. |
| 3. | Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. |
| 4. | Wiggle the wiring and connectors while checking for shorted and open circuits. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No