90A4

90A4-AMBIENT TEMPERATURE SENSOR CIRCUIT HIGH





For a complete wiring diagram Refer to the Wiring Information Electrical Diagrams.






1. CHECK FOR ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 2

No

- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.

2. AMBIENT TEMPERATURE SENSOR
1. Turn the ignition off.
2. Disconnect the Ambient Temperature Sensor harness connector.
3. Connect a jumper wire between the Ambient Temperature Sensor Signal and Return circuits in the Ambient Temperature Sensor harness connector.
4. Turn the ignition on.
5. With the scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 3

No

- Replace the Ambient Temperature Sensor.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

3. AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the BCM C9 harness connector.
3. Measure the resistance of the Ambient Temperature Sensor Signal circuit.

Is the resistance above 10K ohms?

Yes

- Repair the Ambient Temperature Sensor Signal circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Go To 4

4. AMBIENT TEMPERATURE SENSOR RETURN CIRCUIT OPEN
1. Measure the resistance of the Ambient Temperature Sensor Return circuit.

Is the resistance above 10K ohms?

Yes

- Repair the Ambient Temperature Sensor Return circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Replace the BCM.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.