B1600-12

B1600-12-LEFT SOLAR SENSOR - CIRCUIT SHORT TO BATTERY





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. If those sensors fall out of predetermined ranges a Diagnostic Trouble Code (DTC) will set. For further information Sun Sensor - Operation

- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater Control detects a short to voltage on Sun Sensor Signal 1 circuit.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. HVAC Pre-Diagnostic Troubleshooting Procedure.

1. CHECK IF DTC IS ACTIVE
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 SIGNAL 1 CIRCUIT FOR A SHORT TO VOLTAGE




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 Signal 1 circuit.

Is there any voltage present?

Yes

- Repair the (G39) Sun Sensor Signal 1 circuit for an short to voltage.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 3

3. CHECK THE (G39) SUN SENSOR SIGNAL 1 CIRCUIT FOR AN OPEN




1. Turn the ignition off to the lock position.
2. Measure the resistance of the (G39) Sun Sensor Signal 1 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 Signal 1 circuit for an open.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 4

4. CHECK THE (C939) SUN SENSOR RETURN CIRCUIT FOR AN OPEN




1. Measure the resistance of the (C121) Sun Sensor Return 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 (C939) Sun Sensor Return circuit for an open.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- 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. Sun Sensor - Removal.
3. Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

Did the DTC reset during or after the HVAC Verification Test?

Yes

- Replace and program the A/C Heater Control. A/C And Heater Control - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.

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. HVAC Verification Test.

No

- Test complete.