SELF-DIAGNOSTIC TEST
A self-diagnostic test is used to determine that the electronics module is operating properly, and that all the PCI data bus messages are being received for initial operation. Initiate the self-diagnostic test as follows
- With the ignition switch in the Off position, on Electronic Vehicle Information Center (EVIC) and Compass Mini-Trip Computer (CMTC) equipped vehicles simultaneously depress and hold the STEP and the RESET buttons. On Compass Temperature Module (CT) equipped vehicles depress the C/T and the US/M push buttons.
- Turn the ignition switch to the On position.
- Following completion of these tests, the electronics module will display one of the following messages: Pass Self Test (EVIC only), PASS (CT, CMTC) - The electronics module is working properly. Failed Self Test (EVIC only), FAIL (CT, CMTC) - The electronics module has an internal failure. The electronics module is faulty and must be replaced.
Note. If the compass functions, but accuracy is suspect, it may be necessary to perform a variation adjustment. This procedure allows the compass unit to accommodate variations in the earth's magnetic field strength, based on geographic location. (Refer to ELECTRICAL/OVERHEAD CONSOLE - STANDARD PROCEDURE - COMPASS VARIATION ADJUSTMENT) .
Note. If the compass reading display is blank and only "CAL" appears in the display, demagnetizing may be necessary to remove excessive residual magnetic fields from the vehicle. (Refer to ELECTRICAL/OVERHEAD CONSOLE - STANDARD PROCEDURE - COMPASS DEMAGNETIZING) .