DTC P1687: No Cluster Bus Message: Testing
- Turn ignition on. Using scan tool, clear DTCs. Cycle ignition switch on and off several times. Using scan tool, read DTCs. If DTC P1687 is displayed, go to next step. If DTC P1687 is not displayed, go to step 3 .
- Using scan tool, attempt to communicate with instrument cluster. If communication can be established with instrument cluster, replace PCM. If communication cannot be established with instrument cluster, repair communication problem. See BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
- Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
- With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
- Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
- Refer to any technical service bulletins that may apply.
- Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
- Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.
If a problem is found, repair as necessary. If no problems are found, test is complete.