Turn ignition on. Using scan tool, clear DTCs. Cycle ignition switch on and off several times. Using scan tool, check for any PCM DTCs. If DTC P1687: NO CLUSTER BUS MESSAGE is not present, turn ignition off and go to next step. If DTC P1687: NO CLUSTER BUS MESSAGE is present, go to step 3.
Turn ignition on. If instrument cluster odometer displays NO BUS, go to next step. If instrument cluster odometer does not display NO BUS, go to step 4.
Turn ignition off. Disconnect instrument cluster Green 10-pin connector. Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, disconnect Body Control Module (BCM) C1 connector. BCM is located on back of junction block at left end of instrument panel. See Figure. Measure resistance of Violet/Yellow wire between terminal No. 5 at instrument cluster Green harness connector and terminal No. 13 at BCM C1 harness connector. See Figure and Fig 1 . If resistance is less than 5 ohms, replace instrument cluster. If resistance is 5 ohms or more, repair open in Violet/Yellow wire. See DATA LINK CONNECTORS article in WIRING DIAGRAMS.
Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, no problem is indicated at this time. Check for any related technical service bulletins that may apply.

Fig 1: Identifying Instrument Cluster Green C1 Harness Connector Terminals

Courtesy of DAIMLERCHRYSLER CORPORATION

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

DTC P1687: No Cluster Bus Message: Testing