C1275

CIRCUIT DESCRIPTION
This DTC is designed to detect no communication with the Electronic Instrument Panel Cluster (IPC) via the serial data link.

CONDITIONS FOR SETTING THE DTC
DTC C1275 can be set anytime after ABS initialization. A malfunction exists if a message from the IPC is not received within seven seconds.

ACTION TAKEN WHEN THE DTC SETS
A serial communication failure does not allow the proper lamp commands to be sent to the IPC. A malfunction DTC is stored.

CONDITIONS FOR CLEARING THE DTC
Conditions for the malfunction are no longer present and the scan tool CLEAR DTCs function is used. One hundred ignition switch key cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
The scan tool Serial Data Link (SDL) monitor used in this diagnostic is within the body portion of the scan tool. This requires exiting from the chassis portion of the scan tool to the main menu and entering into the body portion of the scan tool and selecting SDL monitor.
With the SDL monitor (ABS to IPC mode), any message that is being transmitted on the serial data link can be observed.

The frequency of the malfunction can be checked by using the ENHANCED DIAGNOSTIC function of the scan tool.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.