Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS 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.
1. Turn the ignition on, engine not running
2. With the scan tool read FDCM DTC(s).
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Go To 8
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.
1. Turn the ignition off.
2. Disconnect the Disconnecting Stabilizer Bar Switch harness connector.
3. Turn the ignition on.
4. Using a test light connected to battery voltage, probe the (T529) Stabilizer Bar Engage LED circuit in the Disconnecting Stabilizer Bar Switch harness connector.
5. 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 LED circuit.
  
  Does the test light illuminate and flash on and off at each circuit?
  
  Yes
  
  Go To 3.
  
  No
  - Go To 5
(T536) LOCKER LED SOURCE CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Disconnecting Stabilizer Bar Switch harness connector
3. Disconnect the FDCM harness connector.
4. Turn the ignition on.
5. 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 the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
(T536) LOCKER LED SOURCE CIRCUIT OPEN
1. Turn the ignition off.
2. 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 the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the open in the (T536) Switch Supply circuit.
  - Perform the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(T529 or T530) STABILIZER BAR LED CIRCUIT(S) SHORTED TO VOLTAGE
1. Disconnect the Disconnecting Stabilizer Bar Switch harness connector.
2. Disconnect the FDCM harness connector.
3. Measure the voltage at each of the following circuit at the FDCM harness connector.
  - (T529) Stabilizer Bar Engage LED circuit.
  - (T530) Stabilizer Bar Disengage LED circuit.
  Does the voltmeter indicate voltage present for any of the above circuit?
  
  Yes
  - Repair the Stabilizer Bar LED circuit(s) that indicated a short to voltage.
  - Perform the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
(T529 or T530) STABILIZER BAR LED CIRCUIT(S) SHORTED TO GROUND
1. Measure the resistance of each of the following circuit at the FDCM harness connector to ground.
  - (T529) Stabilizer Bar Engage LED circuit.
  - (T530) Stabilizer Bar Disengage LED circuit.
  Does the Ohmmeter read below 100 Ohms for any of the above circuit checks?
  
  Yes
  - Repair the short to ground in the LED circuit that indicated the resistance reading below 100 Ohms.
  - Perform the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 7
(T529 or T530) STABILIZER BAR LED CIRCUIT(S) OPEN
1. 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 LED circuit
  - (T530) Stabilizer Bar Disengage LED circuit
  Does the Ohmmeter indicate each measurement below 5.0 Ohms?
  
  Yes
  - Replace the Final Drive Control Module (FDCM) in accordance with the Service Information. Refer to ACTUATOR, STABILIZER BAR, REMOVAL .
  - Perform the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the Stabilizer Bar LED Sense circuit(s) that indicated an open circuit.
  - Perform the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
4. 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 the FDCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test Complete.