Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

DETERMINING IF DIAGNOSTIC TROUBLE CODE (DTC) IS CURRENT
1. With the scan tool, read and record the WCM DTCs.
2. With the scan tool, erase the WCM DTCs
  NOTE: Perform the following test several times to ensure the DTC is current.
3. Turn the ignition off.
4. Wait 10 seconds.
5. Turn the ignition on.
6. With the scan tool, read the WCM DTCs.
  Does the scan tool display the DTC that was previously erased?
  
  Yes
  - Go to step 2
  No
  - The conditions that set the DTC are no longer present. Inspect the wiring harness and related connectors for damage, pin push out or corrosion.
(A935) FUSED B(+) CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the Steering Column-Lock Module harness connector.
3. Using a 12-volt test light connected to ground, probe the (A935) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 3
  No
  - Repair the (A935) Fused B(+) circuit for an open.
  - Perform the WCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Wireless Control (WCM) - Standard Procedure
(A306) FUSED B(+) CIRCUIT OPEN
1. Using a 12-volt test light connected to ground, probe the (A306) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 4
  No
  - Repair the (A306) Fused B(+) circuit for an open.
  - Perform the WCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Wireless Control (WCM) - Standard Procedure
(Z906) GROUND CIRCUIT OPEN
1. Using a 12-volt test light connected to 12-volts, check the (Z906) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 5
  No
  - Repair the (Z906) Ground circuit for an open.
  - Perform the WCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Wireless Control (WCM) - Standard Procedure
(D508) COM-LIN (TPM) LAN CIRCUIT OPEN
1. Disconnect the SKREEM/WCM harness connector.
2. Measure the resistance of the (D508) COM-LIN (TPM) LAN circuit between the SKREEM/WCM harness connector and the Steering Column-Lock Module connector.
  Is resistance below 5.0 ohms?
  
  Yes
  - Replace the Sentry Key Remote Entry Module/Steering Column-Lock Module in accordance with the Service Information.
  - Perform the WCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Wireless Control (WCM) - Standard Procedure
  No
  - Repair the (D508) COM-LIN (TPM) LAN circuit for an open.
  - Perform the WCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Wireless Control (WCM) - Standard Procedure