B1029-13

B1029-13-AMBIENT TEMPERATURE SENSOR - CIRCUIT OPEN

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the Body Control Module not in sleep mode.

Battery voltage greater than 10.4 volts.

- Set Condition:
The Body Control Module (BCM) detects the Ambient Air Temperature Sensor input voltage is outside the normal range.





1. VERIFY THE DTC IS ACTIVE

NOTE: Diagnose and repair any system voltage DTCs before continuing with this test.

1. Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

2. With the scan tool, read DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. 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.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE AMBIENT AIR TEMPERATURE SENSOR

NOTE: The Ambient Air Temperature (AAT) sensor is integral to the Passenger Outside Rearview Mirror.

1. Turn the ignition off.
2. Disconnect the Passenger Outside Rearview Mirror harness connector.
3. Connect a jumper wire between the (G31) AAT Sensor Signal circuit and the (G931) Sensor Return in the Passenger Outside Rearview Mirror harness connector.
4. Turn the ignition on.
5. With the scan tool, read the DTCs.

Does the scan tool display DTC: B1029-11-AMBIENT TEMPERATURE SENSOR - CIRCUIT SHORT TO GROUND?

Yes

- Verify there is good pin to terminal contact in the Passenger Outside Rearview Mirror and BCM harness connectors. Replace the Passenger Outside Rearview Mirror if no problems were found with the connectors. Outside Rearview Mirror - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK THE (G31) AAT SENSOR SIGNAL CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the BCM C1 harness connector.
3. Measure the resistance of the (G31) AAT Sensor Signal circuit between the Passenger Outside Rearview Mirror harness connector and the BCM C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair the open in the (G31) AAT Sensor Signal circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (G931) SENSOR RETURN CIRCUIT FOR AN OPEN
1. Measure the resistance of the (G931) Sensor Return circuit between the Passenger Outside Rearview Mirror harness connector and the BCM C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 5

No

- Repair the open in the (G931) Sensor Return circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. BODY CONTROL MODULE (BCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Passenger Outside Rearview Mirror and the BCM.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Verify that there is good pin to terminal contact in the Passenger Outside Rearview Mirror and BCM connectors.
5. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
6. Look for the data to change or for the DTC to reset during the wiggle test.
7. Perform any Technical Service Bulletins (TSB)s that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the BCM. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.