B1668

B1668-REVERSE LAMP CONTROL CIRCUIT HIGH







- When Monitored:
With the ignition on.

- Set Condition:
The Front Control Module (FCM) detects a short to voltage condition.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all FCM DTCs.
3. Shift the transmission into reverse.
4. With the scan tool, read DTCs.

Does the scan tool display: B1668-REVERSE LAMP CONTROL CIRCUIT HIGH?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (L1) BACK-UP LAMP FEED CIRCUIT SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the IPM C2 harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (L1) Back-up Lamp Feed circuit.

Is the voltage greater than 10.0 volts?

Yes

- Repair the short to voltage in the (L1) Back-up Lamp Feed circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK (L1) BACK-UP LAMP FEED CIRCUIT IN IPM FOR A SHORT TO BATTERY VOLTAGE




1. Turn the ignition off.
2. Disconnect the Front Control Module (FCM) from the IPM 49-way connector.
3. Reconnect the IPM C2 harness connector.
4. Measure the voltage between ground and the (L1) Back-up Lamp circuit.

Is there any voltage present?

Yes

- Replace the Integrated Power Module (IPM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Front Control Module (FCM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.