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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - *NO RESPONSE FROM BODY CONTROL MODULE

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the Airbag Control Module.
With the DRB, attempt to communicate with the Instrument Cluster.
Was the DRB able to I/D or communicate with the either module?
Yes --> Go To 2
No --> Refer to PCI BUS COMMUNICATION FAILURE .
Perform BODY VERIFICATION TEST - VER 1  .		 All
2 Turn the ignition off.
Disconnect the BCM C1 and C2 harness connectors.
Using a 12-volt test light connected to 12-volts, probe the each ground circuit.
Is the test light illuminated for each circuit?
Yes --> Go To 3
No --> Repair the ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1  .		 All
3
NOTE: Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If not, refer to the appropriate test and repair as necessary.
Disconnect the BCM C1 harness connector.Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.Connect the scope input cable to the channel one connector on the DRB. Attach the red and black leads and the cable to probe adapter to the scope input cable.With the DRBIII® select Pep Module Tools.Select lab scope.Select Live Data.Select 12 volt square wave.Press F2 for Scope.Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus circuit in the BCM connector.Turn the ignition on.Observe the voltage display on the DRB Lab Scope.Does the voltage pulse from 0 to approximately 7.5 volts?Yes --> Go To 4No --> Repair the PCI Bus circuit for an open.Perform BODY VERIFICATION TEST - VER 1  .		 All
4 If there are no possible causes remaining, view repair.
Repair
Replace the Body Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1  .		 All
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