Final Drive Control Module (Fdcm) - Electrical Diagnostics: Other RAM Cab & Chassis 3500 HD

WHEN MONITORED

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

SET CONDITION

The FDCM detects the Front Locker Source circuit is shorted low.

POSSIBLE CAUSES

Scheme 427

Scheme 428

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
2. FRONT 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 Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the Front Locker harness connector. With the scan tool, actuate the Front Locker Solenoid. Does the test light illuminate and flash on and off? Yes Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T520) FRONT LOCKER SOURCE CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T520) Front Locker Source circuit at the FDCM harness connector to ground. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T520) Front Locker Source circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T520) CHECK FRONT LOCKER SOURCE CIRCUIT FOR A SHORT TO (T524) FRONT LOCKER RETURN CIRCUIT Measure the resistance between the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short between (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 5 .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

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

The FDCM detects the Front Locker Source circuit is shorted high.

Scheme 429

Scheme 430

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
2. FRONT 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 Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the Front Locker harness connector. With a scan tool, actuate the Front Locker Solenoid. Does the test light flash on and off? Yes Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T520) FRONT LOCKER SOURCE CIRCUIT FOR A SHORT TO BATTERY VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T520) Front Locker Source circuit at the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T520) Front Locker Source circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T524) CHECK FRONT LOCKER RETURN CIRCUIT FOR AN OPEN Measure the resistance of the (T524) Front Locker Return circuit from the Front Locker Solenoid harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 5 . No Repair the open in the (T524) Front Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

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

The FDCM detects the Front Locker Source circuit is open.

Scheme 431

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. FRONT 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 Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the Front Locker harness connector. With a scan tool, actuate the Front Locker Solenoid. Does the test light flash on and off? Yes Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T520) CHECK FRONT LOCKER SOURCE CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the resistance of the (T520) Front Locker Source circuit from the FDCM harness connector and the Front Locker Solenoid harness connector. Is the resistances below 5.0 ohms? Yes Go To 4 . No Repair the open in the (T520) Front Locker Source circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C141D-REAR DIFFERENTIAL CONTROL CIRCUIT LOW

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

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

The FDCM detects the Rear Locker Source circuit is shorted low.

Scheme 432

Scheme 433

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T526) REAR LOCKER SOURCE CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T526) Rear Locker Source circuit at the FDCM harness connector to ground. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T526) Rear Locker Source circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T526) REAR LOCKER SOURCE CIRCUIT FOR A SHORT TO (T528) REAR LOCKER RETURN CIRCUIT Measure the resistance between the (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit in the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short between (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 5 .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C141E-REAR DIFFERENTIAL CONTROL CIRCUIT HIGH

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

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

The FDCM detects the Rear Locker Source circuit is shorted high.

Scheme 434

Scheme 435

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T526) REAR LOCKER SOURCE CIRCUIT FOR A SHORT TO BATTERY VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T526) Rear Locker Source circuit at the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T526) Rear Locker Source circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T528) REAR LOCKER RETURN CIRCUIT FOR AN OPEN Measure the resistance of the (T528) Rear Locker Return circuit from the Rear Locker Solenoid harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 5 . No Repair the open in the (T528) Rear Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C141F-REAR DIFFERENTIAL CONTROL CIRCUIT FOR AN OPEN

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

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

The FDCM detects the Rear Locker Source circuit is open.

Scheme 436

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T526) REAR LOCKER SOURCE CIRCUIT FOR AN 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C143A - DIFFERENTIAL/LOCKER SELECT SWITCH PERFORMANCE

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article

Ignition on.

During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch resistance is out of specification.

Scheme 437

Scheme 438

1. DTC ACTIVE 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. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. DISCONNECTING STABILIZER BAR SWITCH 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 Disconnecting Stabilizer Bar Switch harness connector. Remove the Disconnecting Stabilizer Bar Switch. Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Locker Switch Supply terminal and the Locker Switch Sense terminal. The resistance must read as follows for each position of the switch. UNLOCK: 5454 ohms +/- 5% RR: 1940 ohms +/- 5% FR/RR: 1075 ohms +/- 5% Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch Yes Go To 3 . No Replace the Disconnecting Stabilizer Bar Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. (T535) LOCKER SWITCH SENSE CIRCUIT FOR AN OPEN Disconnect the FDCM harness connector. Measure the resistance of the (T535) Locker Switch Sense circuit between the Disconnecting Stabilizer Bar Switch and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 4 . No Repair the open or high resistance in the (T535) Locker Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
4. (T537) LOCKER SWITCH SUPPLY CIRCUIT FOR AN OPEN Measure the resistance of the (T537) Locker Switch Supply circuit between the Disconnecting Stabilizer Bar Switch and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Replace the FDCM in accordance with the Service Information Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the open or high resistance in the (T537) Locker Switch Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. While monitoring the TRAC State on the scan tool, move the switch to each position. The scan tool display must match the position on the actual switch. Were there any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C143B-DIFFERENTIAL/LOCKER SELECT SWITCH CIRCUIT LOW

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

Ignition on.

During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch sense is below 0.25 volt.

Scheme 439

Scheme 440

1. DTC ACTIVE 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. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. DISCONNECTING STABILIZER BAR SWITCH 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 Disconnecting Stabilizer Bar Switch harness connector. Remove the Disconnecting Stabilizer Bar Switch. Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Locker Switch Supply terminal and the Locker Switch Sense terminal. The resistance must read as follows for each position of the switch. UNLOCK: 5454 ohms +/- 5% RR: 1940 ohms +/- 5% FR/RR: 1075 ohms +/- 5% Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch Yes Go To 3 . No Replace the Disconnecting Stabilizer Bar Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. (T535) LOCKER SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND Disconnect the FDCM harness connector. Measure the resistance of the (T535) Locker Switch Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector to ground. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T535) Locker Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T537) LOCKER SWITCH SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance of the (T537) Locker Switch Supply circuit in the Disconnecting Stabilizer Bar Switch harness connector to ground. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T537) Locker Switch Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace the FDCM in accordance with the Service Information Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. While monitoring the TRAC State on the scan tool, move the switch to each position. The scan tool display must match the position on the actual switch. Were there any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C143C-DIFFERENTIAL/LOCKER SELECT SWITCH CIRCUIT HIGH

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

Ignition on.

During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch Sense circuit is above 4.5 volts.

Scheme 441

Scheme 442

1. DTC ACTIVE 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. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
2. DISCONNECTING STABILIZER SWITCH 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 Disconnecting Stabilizer Bar Switch harness connector. Remove the Disconnecting Stabilizer Bar Switch. Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Locker Switch Supply terminal and the Locker Switch Sense terminal. The resistance must read as follows for each position of the switch. UNLOCK: 5454 ohms +/- 5% RR: 1940 ohms +/- 5% FR/RR: 1075 ohms +/- 5% Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch Yes Go To 3 . No Replace the Disconnecting Stabilizer Bar Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. (T535) LOCKER SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T535) Locker Switch Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T535) Locker Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T537) LOCKER SWITCH SUPPLY CIRCUIT FOR A SHORT TO (T535) LOCKER SWITCH SENSE CIRCUIT Measure the resistance between (T537) Locker Switch Supply circuit and the (T535) Locker Switch Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between (T537) Locker Switch Supply circuit and the (T535) Locker Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 5 .
5. (T535) LOCKER SWITCH SENSE CIRCUIT FOR AN OPEN Measure the resistance of the (T535) Locker Switch Sense circuit between the Disconnecting Stabilizer Bar Switch and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the open in the (T535) Locker Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. While monitoring the TRAC State on the scan tool, move the switch to each position. The scan tool display must match the position on the actual switch. Were there any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Scheme 443

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

Ignition on.

During switch operation, the FDCM senses the Disconnecting Stabilizer Switch resistance is out of specification.

Scheme 444

Scheme 445

1. DTC ACTIVE 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. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. DISCONNECTING STABILIZER SWITCH 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 Disconnecting Stabilizer Switch harness connector. Remove the Disconnecting Stabilizer Switch. Measure the resistance on the Disconnecting Stabilizer Switch between the Switch Supply terminal and the Stabilizer Bar Switch Sense terminal. The resistance must read as follows for each position of the switch. Off Road: 33 ohms +/- 5% On Road: 510 ohms +/- 5% Switch Not Applied: 2.2k ohms +/- 5% Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Switch ? Yes Go To 3 . No Replace the Disconnecting Stabilizer Switch in accordance with service information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. (T531) STABILIZER BAR SWITCH SENSE CIRCUIT FOR AN OPEN Disconnect the FDCM harness connector. Measure the resistance of the (T531) Stabilizer Bar Switch Sense circuit between the Disconnecting Stabilizer Switch and the FDCM harness connectors. Is the resistance below 5.0 ohms? Yes Go To 4 . No Repair the open or high resistance in the (T531) Stabilizer Bar Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
4. (T536) SWITCH SUPPLY CIRCUIT FOR AN OPEN Measure the resistance of the (T536) Switch Supply circuit between the Disconnecting Stabilizer Switch and the FDCM harness connectors. Is the resistance below 5.0 ohms? Yes Replace the FDCM in accordance with the Service Information Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the open or high resistance in the (T536) Switch Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. While monitoring the Stabilizer Bar State on the scan tool, move the switch to each position. The scan tool display must match the position on the actual switch. Were there any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C143E-STABILIZER BAR SWITCH CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Ignition on.

During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch sense is below 0.25 volt.

Scheme 446

Scheme 447

1. DTC ACTIVE 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. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. DISCONNECTING STABILIZER BAR SWITCH OPERATION Turn the ignition off. Disconnect the Disconnecting Stabilizer Switch harness connector. Remove the Disconnecting Stabilizer Switch. Measure the resistance on the Disconnecting Stabilizer Switch between the Switch Supply terminal and the Stabilizer Switch Sense terminal. The resistance must read as follows for each position of the switch. Off Road: 33 Ohms +/- 5% On Road: 510 Ohms +/- 5% Switch Not Applied: 2.2k Ohms +/- 5% Does the Ohmmeter read correctly for each position of the Stabilizer Bar Switch Yes Go To 3 . No Replace the Disconnecting Stabilizer Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. (T531) STABILIZER BAR SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND Disconnect the FDCM harness connector. Measure the resistance of the (T531) Stabilizer Bar Switch Sense circuit in the Disconnecting Stabilizer Switch harness connector to ground. Is the resistance below 5.0 Ohms? Yes Repair the short to ground in the (T531) Disconnecting Stabilizer Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T536) SWITCH SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance of the (T536) Switch Supply circuit in the Disconnecting Stabilizer Switch harness connector to ground. Is the resistance below 5.0 Ohms? Yes Repair the short to ground in the (T536) Switch Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace the FDCM in accordance with the Service Information Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. While monitoring the Stabilizer Bar State on the scan tool, move the switch to each position. The scan tool display must match the position on the actual switch. Were there any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C143F-STABILIZER SELECT SWITCH CIRCUIT HIGH

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

Ignition on.

During switch operation, the FDCM senses the Stabilizer Bar Switch Sense circuit is above 4.0 volts.

Scheme 448

Scheme 449

1. DTC ACTIVE 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. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
2. DISCONNECTING STABILIZER BAR SWITCH OPERATION Turn the ignition off. Disconnect the Disconnecting Stabilizer Bar Switch harness connector. Remove the Disconnecting Stabilizer Bar Switch. Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Switch Supply terminal and the Stabilizer Bar Switch Sense terminal. The resistance must read as follows for each position of the switch. Off Road: 33 ohms +/- 5% On Road: 510 ohms +/- 5% Switch Not Applied: 2.2k ohms +/- 5% Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch Yes Go To 5 . No Replace the Disconnecting Stabilizer Bar Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. (T531) STABILIZER BAR SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T531) Stabilizer Bar Switch Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T531) Stabilizer Bar Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T536) SWITCH SUPPLY CIRCUIT FOR A SHORT TO (T531) STABILIZER BAR SWITCH SENSE CIRCUIT Measure the resistance between (T536) Switch Supply circuit and the (T531) Stabilizer Bar Switch Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between (T536) Switch Supply circuit and the (T531) Stabilizer Bar Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 5 .
5. (T531) STABILIZER BAR SWITCH SENSE CIRCUIT FOR AN OPEN Measure the resistance of the (T531) Stabilizer Bar Switch Sense circuit between the Disconnecting Stabilizer Bar Switch and the FDCM harness connectors. Is the resistance below 5.0 ohms? Yes Replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the open in the (T531) Stabilizer Bar Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. While monitoring the Stabilizer Bar State on the scan tool, move the switch to each position. The scan tool display must match the position on the actual switch. Were there any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

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

The FDCM detects the Front Locker Source circuit is shorted low.

Scheme 450

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. FRONT 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 Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the Front Locker harness connector. With a scan tool, actuate the Front Locker Solenoid. Does the test light flash on and off? Yes Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T524) FRONT LOCKER RETURN CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T524) Front Locker Return circuit in the FDCM harness connector to ground. Is the resistance below 100 ohms? Yes Repair the short to ground in (T524) Front Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

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

The FDCM detects the Front Locker Source circuit is shorted low.

Scheme 451

Scheme 452

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
2. FRONT 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 Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the Front Locker harness connector. With a scan tool, actuate the Front Locker Solenoid. Does the test light flash on and off? Yes Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T524) FRONT LOCKER RETURN CIRCUIT FOR A SHORT TO BATTERY VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T524) Front Locker Return circuit at the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T524) Front Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T524) FRONT LOCKER RETURN CIRCUIT FOR A SHORT TO (T520) FRONT LOCKER SOURCE CIRCUIT Turn the ignition off. Measure the resistance between the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short between (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 5 .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C144A-REAR DIFFERENTIAL RETURN CIRCUIT LOW

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

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

The FDCM detects the Rear Locker Source circuit is shorted low.

Scheme 453

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T528) REAR LOCKER RETURN CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T528) Rear Locker Return circuit in the FDCM harness connector to ground. Is the resistance below 100 ohms? Yes Repair the short to ground in (T528) Rear Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C144B-REAR DIFFERENTIAL RETURN CIRCUIT HIGH

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

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

The FDCM detects the Rear Locker Source circuit is shorted low.

Scheme 454

Scheme 455

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T528) REAR LOCKER RETURN CIRCUIT FOR A SHORT TO BATTERY VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T528) Rear Locker Return circuit at the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T528) Rear Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T528) REAR LOCKER RETURN CIRCUIT FOR A SHORT TO (T526) REAR LOCKER SOURCE CIRCUIT Turn the ignition off. Measure the resistance between the (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit in the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short between (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 5 .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C144E-FRONT DIFFERENTIAL POSITION SENSOR PERFORMANCE

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

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

The FDCM detects that the Front Differential Position Sensor is in an unexpected state.

Scheme 456

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
2. FRONT DIFFERENTIAL POSITION SENSOR WIRING 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. Using the scan tool, actuate the Front Locker Solenoid. Monitor the Front Differential Position Sensor State. Wiggle the related wiring harness from the FDCM to the Front Locker Solenoid connector at the axle. With a scan tool, actuate the Front Locker Solenoid. Does the state on the scan tool change while wiggling the wiring harness? Yes Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Check the Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. FRONT DIFFERENTIAL POSITION SENSOR OPERATION Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sensor Supply circuit in the Front Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T522) Front Locker Sensor Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds. Does the state change on the scan tool while tapping the terminal? Yes Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T522) FRONT LOCKER SENSOR SENSE CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T522) Front Locker Sensor Sense circuit between the Front Locker Solenoid harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 5 . No Repair the open in the (T522) Front Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

C144F-FRONT DIFFERENTIAL POSITION SENSOR LOW

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

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

The FDCM detects that the Front Differential Position Sensor is short low.

Scheme 457

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. FRONT DIFFERENTIAL POSITION SENSOR 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. Using the scan tool, ignition on, monitor the Front Locker Sensor state. Disconnect the Front Locker Solenoid harness connector. Does the state change on the scan tool from Locked to Unlocked? Yes Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T522) FRONT LOCKER SENSOR SENSE CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T522) Front Locker Sensor Sense circuit in the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Repair the short to ground in the (T522) Front Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .

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

The FDCM detects that the Front Differential Position Sensor is shorted to voltage.

Scheme 458

Scheme 459

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 7 .
2. (T522) FRONT LOCKER SENSOR SENSE SHORTED TO BATTERY VOLTAGE 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 Front Locker Solenoid harness connector. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T522) Front Locker Sensor Sense circuit in the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T522) Front Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. FRONT DIFFERENTIAL POSITION SENSOR OPERATION Turn the ignition off. Connect the FDCM harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sensor Supply circuit in the Front Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T522) Front Locker Sensor Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds. Does the state change on the scan tool while tapping the terminal? Yes Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T522) FRONT LOCKER SENSOR SENSE CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T522) Front Locker Sensor Sense circuit between the Front Locker Solenoid harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 5 . No Repair the open in the (T522) Front Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. (T522) FRONT LOCKER SENSOR SENSE CIRCUIT FOR A SHORT TO (T521) LOCKER SENSOR 1 SUPPLY Measure the resistance between the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sensor 1 Supply circuit in the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sensor 1 Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 6 .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
7. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

The ignition on. Disconnecting Stabilizer Bar Switch in the RR or FR/RR position.

The FDCM detects that the Rear Differential Position Sensor is in an unexpected state.

Scheme 460

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 6 .
2. REAR DIFFERENTIAL POSITION SENSOR WIRING 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. Using the scan tool, actuate the Rear Locker Solenoid. Monitor the Rear Differential Position Sensor State. Wiggle the related wiring harness from the FDCM to the Rear Locker Solenoid connector at the axle. With a scan tool, actuate the Rear Locker Solenoid. Does the state on the scan tool change while wiggling the wiring harness? Yes Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Check the Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. REAR DIFFERENTIAL POSITION SENSOR OPERATION Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T527) Rear Locker Sensor Sense circuit and the (T521) Locker Sensor Supply circuit in the Rear Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T527) Rear Locker Sensor Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds. Does the state change on the scan tool while tapping the terminal? Yes Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T527) REAR LOCKER SENSOR SENSE CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T527) Rear Locker Sensor Sense circuit between the Rear Locker Solenoid harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 5 . No Repair the open in the (T527) Rear Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

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

The FDCM detects that the Rear Differential Position Sensor is short low.

Scheme 461

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. REAR DIFFERENTIAL POSITION SENSOR 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. Using the scan tool, ignition on, monitor the Rear Locker Sensor state. Disconnect the Rear Locker Solenoid harness connector. Does the state change on the scan tool from Locked to Unlocked? Yes Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T527) REAR LOCKER SENSOR SENSE CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T527) Rear Locker Sensor Sense circuit in the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Repair the short to ground in the (T527) Rear Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

The ignition on. Disconnecting Stabilizer Bar Switch in the RR or FR/RR position.

The FDCM detects that the Rear Differential Position Sensor is shorted to voltage.

Scheme 462

Scheme 463

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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 7 .
2. (T527) REAR LOCKER SENSOR SENSE CIRCUIT SHORTED TO BATTERY VOLTAGE 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. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T527) Rear Locker Sensor Sense circuit in the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T527) Rear Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. REAR DIFFERENTIAL POSITION SENSOR OPERATION Turn the ignition off. Connect the FDCM harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T527) Rear Locker Sensor Sense circuit and the (T521) Locker Sensor Supply circuit in the Rear Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T527) Rear Locker Sensor Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds. Does the state change on the scan tool while tapping the terminal? Yes Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T527) REAR LOCKER SENSOR SENSE CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T527) Rear Locker Sensor Sense circuit between the Rear Locker Solenoid harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 5 . No Repair the open in the (T527) Rear Locker Sensor Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. (T527) REAR LOCKER SENSOR SENSE CIRCUIT FOR A SHORT TO (T523) LOCKER SENSOR 2 SUPPLY Measure the resistance between the (T527) Rear Locker Sensor Sense circuit and the (T523) Locker Sensor 2 Supply circuit in the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between the (T527) Rear Locker Sensor Sense circuit and the (T523) Locker Sensor 2 Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 6 .
6. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
7. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Continuously.

The Final Drive Control Module detects that system voltage is below 9.0 volts for 60 seconds.

Scheme 464

1. CHARGING SYSTEM DTC's PRESENT Ignition on, engine not running. With the scan tool, read DTC's. Are there any Charging System or related voltage DTC's present? Yes Perform the appropriate Charging System DTC diagnostic procedures before continuing with this test. Refer to «CHARGING SYSTEM - DIAGNOSIS AND TESTING»(ref-476520-S37397232942012060400000) . No Go To 2 .
2. DTC IS ACTIVE With the scan tool, read DTC's. Is the status Active for this DTC? Yes Go To 3 . No Go To 5 .
3. (A34) FUSED B+ CIRCUIT FOR AN OPEN OR HIGH RESISTANCE Turn the ignition off. Disconnect the FDCM harness connector. Ignition on, engine not running. With a 12-volt test light connected to ground, check the (A34) Fused B+ circuit in the FDCM harness connector. NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Go To 4 . No Repair the (A34) Fused B+ circuit for an open circuit or high resistance. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
4. FINAL DRIVE CONTROL MODULE (FDCM) View repair. Repair Replace the Final Drive Control Module (FDCM) in accordance with the service information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Were any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test complete.

Continuously.

The Final Drive Control Module (FDCM) detects that system voltage is above 16.0 volts for 10 seconds with engine RPM greater than 350.

Scheme 465

1. CHARGING SYSTEM DTC's PRESENT Ignition on, engine not running. With the scan tool, read DTC's. Are there any Charging System or related voltage DTC's present? Yes Perform the appropriate Charging System DTC diagnostic procedures before continuing with this test. Refer to «CHARGING SYSTEM - DIAGNOSIS AND TESTING»(ref-476520-S37397232942012060400000) . No Go To 2 .
2. DTC IS ACTIVE With the scan tool, read DTC's. Is the status Active for this DTC? Yes Go To 3 . No Go To 5 .
3. FINAL DRIVE CONTROL MODULE (FDCM) GROUND CIRCUITS OPEN OR HIGH RESISTANCE Turn the ignition off. Disconnect the FDCM harness connector. Ignition on, engine not running. With a 12-volt test light connected to B+, check the (Z935) Ground circuits in the FDCM harness connector. NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly for each of the Ground circuits? Yes Go To 4 . No Repair the (Z935) Ground circuit(s) for an open circuit or high resistance. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
4. FINAL DRIVE CONTROL MODULE (FDCM) View the repair. Repair Replace the Final Drive Control Module (FDCM) in accordance with the service information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Were any problems found? Yes Repair as necessary. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test complete.

Ignition on.

The FDCM recognizes the Locker Sensor Supply circuit voltage is too low.

Scheme 466

Scheme 467

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 a scan tool, read DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. FRONT DIFFERENTIAL POSITION SENSOR 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 Front Locker Solenoid harness connector. Turn the ignition on. Measure the voltage of the (T521) Locker Sensor 1 Supply circuit in the Front Locker Solenoid harness connector. Is the voltage between 4.5 and 5.0 volts? Yes Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T521) LOCKER SENSOR SUPPLY 1 CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T521) Locker Sensor 1 Supply circuit at the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T521) Locker Sensor 1 Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Ignition on.

The FDCM recognizes the Locker Sensor Supply circuit voltage is too high.

Scheme 468

1. ACTIVE DTC 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. Ignition on, engine not running. With a scan tool, read DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. FRONT DIFFERENTIAL POSITION SENSOR 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. Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Turn the ignition on. Measure the voltage of the (T521) Locker Sensor 1 Supply circuit in the Front Locker Solenoid harness connector. Is the voltage above 4.5 volts? Yes Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T521) LOCKER SENSOR 1 SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T521) Locker Sensor 1 Supply circuit at the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T521) Locker Sensor 1 Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Ignition on.

The FDCM has detected a short to voltage, ground or an open in the Stabilizer Bar Disengage or Engage Illumination Sense circuits.

Scheme 469

Scheme 470

Scheme 471

Scheme 472

Scheme 473

Scheme 474

Scheme 475

Scheme 476

1. DTC ACTIVE 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. NOTE: If set along with this DTC, diagnostic any Locker/Differential Indicator Control Circuit DTC(s) first before continuing. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 11 .
2. (T530) STABILIZER BAR DISENGAGE ILLUMINATION SENSE 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 Disconnecting Stabilizer Bar Switch harness connector. Using a 12-volt test light connected to battery voltage, probe the (T530) Stabilizer Bar Disengage Illumination Sense circuit. Turn the ignition on. With the scan tool, actuate the Stabilizer Bar Disengage Illumination Sense circuit. Does the test light illuminate and flash on and off? Yes Go to 3 . No Go To 4 .
3. (T529) STABILIZER BAR ENGAGE ILLUMINATION SENSE OPERATION Probe the Stabilizer Bar Disengage Illumination Sense circuit with the test light. With the scan tool, actuate the (T529) Stabilizer Bar Engage Illumination Sense circuit. Does the test light illuminate and flash on and off? Yes Replace the Disconnecting Stabilizer Bar Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go to 7 .
4. (T530) STABILIZER BAR DISENGAGE ILLUMINATION SENSE CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T530) Stabilizer Bar Disengage Illumination Sense circuit in the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T530) Stabilizer Bar Disengage Illumination Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 5 .
5. (T530) STABILIZER BAR DISENGAGE ILLUMINATION SENSE CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Measure the resistance of the (T530) Stabilizer Bar Disengage Illumination Sense circuit between ground and the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T530) Stabilizer Bar Disengage Illumination Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 6 .
6. (T530) STABILIZER BAR DISENGAGE ILLUMINATION SENSE CIRCUIT FOR AN OPEN Measure the resistance of the (T530) Stabilizer Bar Disengage Illumination Sense circuit between the Disconnecting Stabilizer Bar Switch harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 10 . No Repair the open in the (T530) Stabilizer Bar Disengage Illumination Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
7. (T529) STABILIZER BAR ENGAGE ILLUMINATION SENSE CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T529) Stabilizer Bar Engage Illumination Sense circuit in the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T529) Stabilizer Bar Engage Illumination Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 8 .
8. (T529) STABILIZER BAR ENGAGE ILLUMINATION SENSE CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Measure the resistance of the (T529) Stabilizer Bar Engage Illumination Sense circuit between ground and the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T529) Stabilizer Bar Engage Illumination Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 9 .
9. (T529) STABILIZER BAR ENGAGE ILLUMINATION SENSE CIRCUIT FOR AN OPEN Measure the resistance of the (T529) Stabilizer Bar Engage Illumination Sense circuit between the Disconnecting Stabilizer Bar Switch harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Go To 10 . No Repair the open in the (T529) Stabilizer Bar Engage Illumination Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
10. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
11. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Ignition on.

The FDCM recognizes the Locker Sensor Supply circuit voltage is too low.

Scheme 477

Scheme 478

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 a scan tool, read DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. REAR DIFFERENTIAL POSITION SENSOR With the voltmeter still connected to the (T523) Locker Sensor Supply 2 Circuit in the Front Locker Solenoid harness connector. While monitoring the voltmeter, disconnect the Rear Locker Solenoid harness connector. Is the voltage between 4.5 and 5.0 volts? Yes Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T523) LOCKER SENSOR SUPPLY 2 CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T523) Locker Sensor Supply 2 Circuit at the FDCM harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (T523) Locker Sensor Supply 2 Circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Ignition on.

The FDCM recognizes the Locker Sensor Supply circuit voltage is too high.

Scheme 479

1. ACTIVE DTC 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. Ignition on, engine not running. With a scan tool, read DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. REAR DIFFERENTIAL POSITION SENSOR With the voltmeter still connected to the (T523) Locker Sensor Supply 2 circuit in the Front Locker Solenoid harness connector. While monitoring the voltmeter, disconnect the Rear Locker Solenoid harness connector. Is the voltage above 4.5 volts? Yes Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 3 .
3. (T523) LOCKER SENSOR SUPPLY 2 CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T523) Locker Sensor Supply 2 circuit at the FDCM harness connector. Does the voltmeter indicate voltage present? Yes Repair the short to voltage in the (T523) Locker Sensor Supply 2 circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

With the ignition on.

The Final Drive Control Module (FDCM) has detected a failure internal to the controller.

Ignition on.

The FDCM sense an incorrect voltage on the Switch Supply circuit other than 12 volts.

Scheme 480

Scheme 481

Scheme 482

1. DTC ACTIVE 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. Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. DISCONNECTING STABILIZER SWITCH 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. NOTE: If set along with this DTC, diagnose any Stabilizer Select Switch DTC(s) first before continuing. Turn the ignition off. Disconnect the Disconnecting Stabilizer Switch harness connector. Turn the ignition on. Measure the voltage on the (T536) Switch Supply circuit in the Disconnecting Stabilizer Switch harness connector. Is the voltage 12 volts? Yes Go To 3 . No Check the (T536) Switch Supply circuit for an open or short to ground condition. If OK, replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. DISCONNECTING STABILIZER SWITCH Using a test light connected to battery voltage, probe the (T532) Locker Open Illumination Sense circuit in the Disconnecting Stabilizer Switch harness connector. With the scan tool, select System Test and actuate the Locker Open Illumination LED. Select the blinking option. NOTE: Repeat the above test for the (T533) Locker Rear Illumination Sense circuit terminal and (T534) Locker FR/RR Illumination Sense circuit one at a time. Does the test light illuminate and flash on and off at each circuit? Yes Replace the Disconnecting Stabilizer Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go to 4 .
4. (T532, T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of each of the following circuits between the FDCM harness connector and the Disconnecting Stabilizer Switch harness connector. (T532) Locker Open Illumination Sense circuit (T533) Locker Rear Illumination Sense circuit (T534) Locker FR/RR Illumination Sense circuit Does the ohmmeter indicate each measurement below 5.0 ohms? Yes Replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the open or high resistance in the Illumination Sense circuit that indicated the incorrect resistance reading. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Ignition on.

The Final Drive Control Module (FDCM) senses the voltage on the Switch Supply circuit is low.

Scheme 483

1. DTC ACTIVE 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 DTC's. Is the DTC active at this time? Yes Go To 2 . No Go To 5 .
2. DISCONNECTING STABILIZER SWITCH 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. NOTE: If set along with this DTC, diagnose any Stabilizer Select Switch DTC(s) first before continuing. Turn the ignition off. Disconnect the Disconnecting Stabilizer Switch harness connector. Ignition on, engine not running Measure the voltage on the (T536) Switch Supply circuit in the Axle Locker Switch harness connector. Is the voltage 12 volts? Yes Go To 3 . No Check the (T536) Switch Supply circuit for an open or short to ground condition. If OK, replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
3. DISCONNECTING STABILIZER SWITCH Using a test light connected to battery voltage, check the (T532) Locker Open Illumination Sense circuit at the Disconnecting Stabilizer Switch harness connector. With the scan tool, select System Test and actuate the Locker Open Illumination LED. Select the blinking option. NOTE: Repeat the above test for the (T533) Locker Rear Illumination Sense circuit terminal and (T534) Locker FR/RR Illumination Sense circuit one at a time. Does the test light illuminate and flash on and off at each circuit? Yes Replace the Disconnecting Stabilizer Switch in accordance with the service information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go to 4 .
4. (T532, T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT FOR A SHORT TO GROUND Disconnect the Disconnecting Stabilizer Switch harness connector. Measure the resistance between the FDCM harness connector and ground for each of the following circuits: (T532) Locker Open Illumination Sense circuit. (T533) Locker Rear Illumination Sense circuit. (T533) Locker Rear Illumination Sense circuit. Does the ohmmeter read below 100 ohms for any of the above circuit checks? Yes Repair the short to ground in the Illumination Sense circuit that indicated the resistance reading below 100 ohms. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Replace the Final Drive Control Module (FDCM) in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test complete.

Ignition on.

The FDCM sense an the voltage on the Switch Supply circuit is high.

Scheme 484

Scheme 485

1. DTC ACTIVE 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. NOTE: If set along with this DTC, diagnose any Stabilizer Select Switch DTC(s) first before continuing. Turn the ignition on, engine not running With the scan tool read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 7 .
2. DISCONNECTING STABILIZER BAR SWITCH 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 Disconnecting Stabilizer Bar Switch harness connector. Turn the ignition on. Using a test light connected to battery voltage, probe the (T532) Locker Open Illumination Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector. With the scan tool select System Test and actuate the Locker Open Illumination LED. Select the blinking option. NOTE: Repeat the above test for the (T533) Locker Rear Illumination Sense circuit and (T534) Locker FR/RR Illumination Sense circuit one at a time. Does the test light illuminate and flash on and off at each circuit? Yes Go To 3 . No Go to 5 .
3. (T536) SWITCH SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Disconnecting Stabilizer Bar Switch harness connector Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T536) Switch Supply circuit in the Disconnecting Stabilizer Switch harness connector. Does the voltmeter indicate voltage present? Yes Replace the Disconnecting Stabilizer Bar Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T536) SWITCH SUPPLY CIRCUIT FOR AN OPEN Turn the ignition off. Measure the resistance of the (T536) Switch Supply circuit between the Disconnecting Stabilizer Switch harness connector and the FDCM harness connector. Is the resistance below 5.0 ohms? Yes Replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the open in the Switch Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. (T532, T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the Disconnecting Stabilizer Switch harness connector. Measure the voltage at each of the following circuit at the FDCM harness connector. (T532) Locker Open Illumination Sense circuit (T533) Locker Rear Illumination Sense circuit (T534) Locker FR/RR Illumination Sense circuit Does the voltmeter indicate voltage present for any of the above circuit? Yes Repair the Locker Illumination Sense circuit that indicated a short to voltage. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 6 .
6. (T532, T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT FOR AN OPEN Measure the resistance of each of the following circuits between the FDCM harness connector and the Disconnecting Stabilizer Switch harness connector. (T532) Locker Open Illumination Sense circuit (T533) Locker Rear Illumination Sense circuit (T534) Locker FR/RR Illumination Sense circuit Does the ohmmeter indicate each measurement below 5.0 ohms? Yes Replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the Locker Illumination Sense circuit that indicated an open circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
7. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

Ignition on.

The FDCM sense an the voltage on the Switch Supply circuit is high.

Scheme 486

Scheme 487

Scheme 488

1. DTC ACTIVE 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. NOTE: If set along with this DTC, diagnose any Stabilizer Select Switch DTC(s) first before continuing. Turn the ignition on, engine not running With the scan tool read FDCM DTC(s). Is the DTC active at this time? Yes Go To 2 . No Go To 8 .
2. DISCONNECTING STABILIZER BAR SWITCH 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 Disconnecting Stabilizer Bar Switch harness connector. Turn the ignition on. Using a test light connected to battery voltage, probe the (T529) Stabilizer Bar Engage Illumination Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector. With the scan tool, select System Test and actuate the Stabilizer Bar Engage Illumination LED. Select the blinking option. NOTE: Repeat the above test for the Stabilizer Bar Disengage Illumination Sense circuit. Does the test light illuminate and flash on and off at each circuit? Yes Go To 3 . No Go To 5 .
3. (T536) SWITCH SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Disconnecting Stabilizer Bar Switch harness connector Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T536) Switch Supply circuit in the Disconnecting Stabilizer Switch harness connector. Does the voltmeter indicate voltage present? Yes Replace the Disconnecting Stabilizer Bar Switch. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 4 .
4. (T536) SWITCH SUPPLY CIRCUIT FOR AN OPEN Turn the ignition off. Measure the resistance of the (T536) Switch Supply circuit between the Disconnecting Stabilizer Switch harness connector and the FDCM harness connector. Is the resistance below 5.0 Ohms? Yes Replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the open in the (T536) Switch Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
5. (T529 or T530) STABILIZER BAR ILLUMINATION SENSE CIRCUIT(S) SHORTED TO VOLTAGE Disconnect the Disconnecting Stabilizer Switch harness connector. Disconnect the FDCM harness connector. Measure the voltage at each of the following circuit at the FDCM harness connector. (T529) Stabilizer Bar Engage Illumination Sense circuit. (T530) Stabilizer Bar Disengage Illumination Sense circuit. Does the voltmeter indicate voltage present for any of the above circuit? Yes Repair the Stabilizer Bar Illumination Sense circuit(s) that indicated a short to voltage. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 6 .
6. (T529 or T530) STABILIZER BAR ILLUMINATION SENSE CIRCUIT(S) SHORTED TO GROUND Measure the resistance of each of the following circuit at the FDCM harness connector to ground. (T529) Stabilizer Bar Engage Illumination Sense circuit. (T530) Stabilizer Bar Disengage Illumination Sense circuit. Does the Ohmmeter read below 100 Ohms for any of the above circuit checks? Yes Repair the short to ground in the Illumination Sense circuit that indicated the resistance reading below 100 Ohms. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Go To 7 .
7. (T529 or T530) STABILIZER BAR ILLUMINATION SENSE CIRCUIT(S) OPEN Measure the resistance of each of the following circuits between the FDCM harness connector and the Disconnecting Stabilizer Switch harness connector. (T529) Stabilizer Bar Engage Illumination Sense circuit (T530) Stabilizer Bar Disengage Illumination Sense circuit Does the Ohmmeter indicate each measurement below 5.0 Ohms? Yes Replace the FDCM in accordance with the Service Information. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Repair the Stabilizer Bar Illumination Sense circuit(s) that indicated an open circuit. Perform FDCM VERIFICATION TEST. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) .
8. 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. Refer to «FDCM VERIFICATION TEST»(ref-476586-S13695316712012060400000) . No Test Complete.

With the ignition on

Battery voltage between 10 and 16 volts

IOD fuse installed

TIPM is configured correctly

Bus messages not received from the ECM/PCM for approximately two to five seconds.

Ignition key on and battery voltage greater than 10.4 volts.

No messages received from the MIC (Instrument Cluster) for more than 20 seconds. One Trip Fault. Three good trips to turn off the MIL.

Perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 3.7L, 4.7L & 5.7L - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE or 5.7L 3500 CAB & CHASSIS - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE or 2500 & 3500 - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L or 3500 CAB & CHASSIS, 4500 & 5500 - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L .

Continuously with the ignition on, one valid CAN message received at least once, and no U0002-CAN C Bus Off Performance DTC present.

When the Final Drive Control Module detects an incorrect CAN message from the Power Control Module (PCM).

With the ignition on for Four seconds, no CAN BUS circuit error condition present, no lost communication with Totally Integrated Power Module (TIPM) condition present, and no system undervoltage or overvoltage condition present.

The Final Drive Control Module (FDCM) is receiving no message or implausible data for Ambient Temperature from the TIPM.