Diagnostic Test

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

Fig 1: Measuring Resistance Of CAN B Bus (+) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the BCM harness connector.

Disconnect the CLP/SSM harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the CAN B Bus (+) circuit from the BCM harness connector to the CLP/SSM 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 VTSS VERIFICATION TEST .
2) MEASURE THE VOLTAGE OF THE CAN B BUS (+) CIRCUIT

Fig 2: Measuring Voltage Of CAN B Bus (+) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Measure the voltage of the CAN B Bus (+) circuit at the CLP/SSM harness connector.

Is voltage present?

Yes
1. Repair the CAN B Bus (+) circuit for a short to voltage.
2. Perform VTSS VERIFICATION TEST .
No
1. Go to step 3).
3) MEASURE THE RESISTANCE OF THE CAN B BUS (+) CIRCUIT

Fig 3: Measuring Resistance Of CAN B Bus (+) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance between ground and the CAN B Bus (+) circuit at the CLP/SSM harness connector.

Is the resistance below 10K ohms?

Yes
1. Repair the CAN B Bus (+) circuit for a short to ground.
2. Perform VTSS VERIFICATION TEST .
No
1. Replace the Central Locking Pump/Security System Module. (Refer to ELECTRICAL/VEHICLE THEFT SECURITY/SENTRY KEY REMOTE ENTRY MODULE - REMOVAL) .
2. Perform VTSS VERIFICATION TEST .