DTC 75

DTC 75 Serial Communication Failure.:

DTC 75 Serial Communication Failure:

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

DTC Will Set When:
DTC 75 can be set anytime after ABS initialization. A malfunction exists if a message from the IPC is not received within 7 seconds.

Action Taken:
A serial communication failure does not allow the proper lamp commands to be sent to the IPC. A malfunction DTC is stored.

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks to see if the IPC is operating properly.
2. Checks to see if communication between the EBCM/EBTCM and the IPC is possible.

Diagnostic Aids:
The Tech 1 serial data link (SDL) monitor used in this diagnostic is within the body portion of the Tech 1 mass storage cartridge. This requires exiting from the chassis portion of the Tech 1 to the main menu and entering into the body portion of the Tech 1 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 Tech 1.

Any circuitry that is suspected as 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.