Self-Diagnostic Test

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

A self-diagnostic test is built-in to the module to determine that the electronics module is operating properly, and that all the J1850 PCI data bus messages are being received for proper operation. To perform the self-diagnostic test proceed as follows:

With the ignition switch in the Off position, simultaneously depress and hold the STEP and RESET buttons.
Turn the ignition switch to the On position.
Following completion of the test, the electronics module will display one of the following messages:
1. Pass Self Test (EVIC only), PASS (CMTC) - The electronics module is working properly.
2. Failed Self Test (EVIC only), FAIL (CMTC) - The electronics module has an internal failure. The electronics module is faulty and must be replaced.
3. Failed J1850 Communication (EVIC only), BUS (CMTC) - The electronics module is not receiving proper message input through the J1850 PCI data bus circuit. This can result from one or more faulty electronic modules in the vehicle, or from a faulty PCI data bus. The use of a DRB III(R) scan tool and BODY DIAGNOSTIC PROCEDURES are required for further diagnosis.

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 COMPASS VARIATION ADJUSTMENT .

NOTE: If the compass reading displays dashes, and only "CAL" appears in the display, demagnetizing may be necessary to remove excessive residual magnetic fields from the vehicle. Refer to COMPASS DEMAGNETIZING .