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 3 times, leaving the ignition on for a minimum of 10 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 TIPM (TOTALLY INTEGRATED POWER MODULE) DTC's
With the scan tool, read TIPM 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: Measuring Resistance Of CAN B Bus (+) Circuit Between TIPM C3 Connector And Window Regulator Module Connector
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the negative battery cable.

Disconnect the appropriate Window Regulator Module connector.

Disconnect the Totally Integrated Power Module C3 connector.

Measure the resistance of the (D55) CAN B Bus (+) circuit between the TIPM C3 connector and the Window Regulator 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: Measuring Resistance Of CAN B Bus (-) Circuit Between TIPM C3 Connector And Window Regulator Module Connector
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the (D54) CAN B Bus (-) circuit between the TIPM C3 connector and the Window Regulator Module connector.

Is the resistance below 2.0 ohms?

Yes
1. Replace the appropriate Window Regulator Module in accordance with the service information.
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) .