C141F

C141F-REAR DIFFERENTIAL CONTROL CIRCUIT OPEN





For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


- When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

- Set Condition:

The FDCM detects the Rear Locker Source circuit is open.






Diagnostic Test


1. ACTIVE DTC

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running.

With the scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Go To5



2. REAR LOCKER SOLENOID OPERATION

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off.

Disconnect the Rear Locker Solenoid harness connector.

Ignition on, engine not running.

Using a 12-volt test light, jump across from the (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit in the Rear Locker harness connector.

With a scan tool, actuate the Rear Locker Solenoid.

Does the test light flash on and off?

Yes

- Inspect the Rear Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Rear Locker Solenoid.
- Perform FDCM VERIFICATION TEST. Verification Tests

No

- Go To 3



3. (T526) REAR LOCKER SOURCE CIRCUIT OPEN





Turn the ignition off.

Disconnect the FDCM harness connector.

Turn the ignition on.

Measure the resistance of the (T526) Rear Locker Source circuit from the FDCM harness connector and the Rear Locker Solenoid harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 4

No

- Repair the open in the (T526) Rear Locker Source circuit.
- Perform FDCM VERIFICATION TEST. Verification Tests



4. FDCM


NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform FDCM VERIFICATION TEST. Verification Tests

No

- Replace and program the Final Drive Control Module.
- Perform FDCM VERIFICATION TEST. Verification Tests



5. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle test the wiring harness and connectors while checking for shorted and open circuits.

Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

Were there any problems found?

Yes

- Repair as necessary.
- Perform FDCM VERIFICATION TEST. Verification Tests

No

- Test Complete.