Diagnostic Test

1) CHECK FOR ACTIVE DTCS
With the scan tool, read the active DTC's.

Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.

With the scan tool, read the active DTC's.

Does the scan tool display this DTC as active?

Yes
1. Go To 2).
No
1. If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2) CHECK THE TOTALLY INTEGRATED POWER MODULE DTC's
With the scan tool, read the Totally Integrated Power Module active DTC's.

Does the scan tool display any CAN B BUS DTC's - ACTIVE?

Yes
1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)
No
1. Go To 3).
3) (D55) CAN B BUS (+) CIRCUIT OPEN

Fig 1: Checking CAN B BUS (+) Circuit For Open
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the negative battery cable.

Disconnect the Hands Free Module harness connector.

Disconnect the Totally Integrated Power Module harness connector.

Measure the resistance of the (D55) CAN B Bus (+) circuit between the Totally Integrated Power Module connector and the Hands Free Module connector.

Is the resistance below 2.0 ohms?

Yes
1. Go To 4).
No
1. Repair the (D55) CAN B Bus (+) circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
4) (D54) CAN B BUS (-) CIRCUIT OPEN

Fig 2: Checking CAN B BUS (-) Circuit For Open
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the (D54) CAN B Bus (-) circuit between the Totally Integrated Power Module connector and the Hands Free Module connector.

Is the resistance below 2.0 ohms?

Yes
1. Replace the Hands Free Module, refer to NAVIGATION/TELECOMMUNICATION - SERVICE INFORMATION article.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
No
1. Repair the (D54) CAN B Bus (-) circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .