C143C-DIFFERENTIAL/LOCKER SELECT SWITCH CIRCUIT HIGH RAM Pickup 1500

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 637

Scheme 638

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 «Standard Procedure»(ref-457882-S11221221782012030200000) .
3. (T535) LOCKER SWITCH SENSE CIRCUIT SHORTED 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 «Standard Procedure»(ref-457882-S11221221782012030200000) . No Go To 4 .
4. (T537) LOCKER SWITCH SUPPLY CIRCUIT SHORTED 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 «Standard Procedure»(ref-457882-S11221221782012030200000) . No Go To 5 .
5. (T535) LOCKER SWITCH SENSE CIRCUIT 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 «Standard Procedure»(ref-457882-S11221221782012030200000) . No Repair the open in the (T535) Locker Switch Sense circuit. Perform FDCM VERIFICATION TEST. Refer to «Standard Procedure»(ref-457882-S11221221782012030200000) .
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 «Standard Procedure»(ref-457882-S11221221782012030200000) . No Test Complete.

Scheme 639

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 640

Scheme 641

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 «Standard Procedure»(ref-457882-S11221221782012030200000) .
3. (T531) STABILIZER BAR SWITCH SENSE CIRCUIT 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 «Standard Procedure»(ref-457882-S11221221782012030200000) .
4. (T536) SWITCH SUPPLY CIRCUIT 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 «Standard Procedure»(ref-457882-S11221221782012030200000) . No Repair the open or high resistance in the (T536) Switch Supply circuit. Perform FDCM VERIFICATION TEST. Refer to «Standard Procedure»(ref-457882-S11221221782012030200000) .
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 «Standard Procedure»(ref-457882-S11221221782012030200000) . No Test Complete.