Suspension Control ( Automatic - Electronic ): Testing and Inspection

CHECKING STABILIZER SELECT SWITCH OPERATION





For a complete wiring diagram Refer to Diagrams/Electrical.







Diagnostic Test


1. STABILIZER SELECT SWITCH OPERATION
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.
Secure the vehicle by blocking the rear wheels from the front and back.
Disconnect the Stabilizer Bar Link on the passenger side.
Turn the ignition on, Stabilizer Select Switch in the ON ROAD position.
The Stabilizer Bar should not move up and down.
Using the Stabilizer Select Switch, select OFF ROAD.
Attempt to move the Stabilizer Bar up and down.
Does the Stabilizer Bar operate as described above?

Yes


- Stabilizer Select Switch is operating normally. Test complete.


No


- Go To2



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 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 To3


No


- Replace the Disconnecting Stabilizer Bar Switch.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test



3. (T531) STABILIZER BAR SWITCH SENSE CIRCUIT SHORTED 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. FDCM Verification Test


No


- Go To4



4. (T536) SWITCH SUPPLY CIRCUIT SHORTED 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. FDCM Verification Test


No


- Go To5



5. (T531) STABILIZER BAR SWITCH SENSE CIRCUIT 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


- Go To6


No


- Repair the open in the (T531) Stabilizer Bar Switch Sense circuit.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test



6. (T536) SWITCH SUPPLY CIRCUIT OPEN




Measure the resistance of the (T536) Switch Supply circuit between the Disconnecting Stabilizer Bar Switch and the FDCM harness connectors.
Is the resistance below 5.0 ohms?

Yes


- Replace the FDCM.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test


No


- Repair the open in the (T536) Switch Supply circuit.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test