Using Input Tests : BCM Diagnostics

Diagnostic Display:

IPC Display.:

With the ignition switch in RUN, enter the Body Computer Module (BCM) diagnostics and select Body Computer Module (BCM) input.




DESCRIPTION:

To enter diagnostic mode, proceed as follows:

1. Turn the ignition "ON."

2. Touch the "OFF" and "TEMP UP" buttons on the ECC panel (non CRT) or the "OFF" and "WARM" buttons (CRT models) simultaneously and hold until all display segments light.

NOTE: Operating the vehicle in the "Diagnostic Mode" for extended time periods without the engine running or without a battery charger will cause the battery to run down and possibly relate false diagnostic information, or cause a no start condition. To ensure proper operation, attach a battery charger on "Trickle" charge if vehicle is to be operated in "Diagnostic Mode" without engine running for periods, longer than 1/2 hour.

After "Diagnostic Mode" is entered any trouble codes stored in computer memory will be displayed on the season odometer. Codes may be stored for the PCM, BCM, or SIR systems. Each trouble code consists of the system abbreviation (E, B, or R) E=PCM B=BCM R=SIR, a three digit code, and the letter C or H. All codes for each system are displayed together, in the order of their three digit number (lowest first - i.e. E013, E014, etc.). The final digit of the code, a C or an H is used to indicate whether the code is current or history.

If no codes are present for a system, a "NO X CODE" message (with X being the system abbreviation - E, B, or R) will be displayed. If the communication line to a component is not operating, a "NO X DATA" message will be displayed, indicating that the BCM could not communicate with that system. At any time during the display of codes, if the "FAN DOWN" button on the ECCP is depressed, the display of the codes will be bypassed. When the "BI-LEVEL" button is pressed the ECCP will exit "Diagnostic Mode" and go back to normal vehicle operation.