Diagnostic Test

1) TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

With the scan tool, record and erase DTC's

Operate the Window Switch several times.

Cycle the ignition from on to off.

Turn the ignition on.

With the scan tool, read DTC's.

Does the scan tool display B18B8-MASTER SWITCH-REAR RIGHT WINDOW SWITCH CIRCUIT?

Yes
1. Go To 2).
No
1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
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) .
2) SWITCH SHORTED

Fig 1: Identifying Window Switch Connector
Courtesy of DAIMLERCHRYSLER CORP.

With the scan tool, erase DTC's.

Disconnect the Window Switch connector.

With the scan tool, read DTC's.

Does the scan tool display B18B8-MASTER SWITCH-REAR RIGHT WINDOW SWITCH CIRCUIT?

No
1. Replace the Window Switch.
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) .
Yes
1. Go To 3).
3) (D506) LIN BUS CIRCUIT PARTIAL SHORT TO GROUND

Fig 2: Measuring Resistance Between Ground And LIN Bus Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Cluster C3 connector.

Measure the resistance between ground and the (D506) LIN Bus circuit.

Is the resistance below 10,000.0 ohms?

Yes
1. Repair the (D506) LIN Bus circuit for a partial short to ground.
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. Replace the Instrument Cluster in accordance with 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) .