Diagnostic Test

1) MEASURE THE RESISTANCE OF THE CAN B BUS (+) CIRCUIT

Fig 1: Checking CAN B Bus (+) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the CAB harness connector.

Disconnect the BCM harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the CAN B Bus (+) circuit from the CAB harness connector to the BCM harness connector.

Is the resistance below 1.0 ohm?

Yes
1. Go to step 2).
No
1. Repair the CAN B Bus (+) circuit for an open.
2. Perform BODY VERIFICATION TEST .
2) MEASURE THE RESISTANCE OF THE CAN B BUS (-) CIRCUIT

Fig 2: Checking CAN B Bus (-) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the CAN B Bus (-) circuit from the CAB harness connector to the BCM harness connector.

Is the resistance below 1.0 ohm?

Yes
1. Replace the Controller Antilock Brake Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/CONTROLLER ANTILOCK BRAKE - REMOVAL) .
2. Perform BODY VERIFICATION TEST .
No
1. Repair the CAN B Bus (-) circuit for an open.
2. Perform BODY VERIFICATION TEST .