Component Tests and General Diagnostics

The Compass Mini-Trip Computer is capable of performing a diagnostic self check on many of its internal functions. Compass Mini-Trip Computer diagnostics may be performed using a DRB III(R) scan tool and the proper Body Diagnostic Procedures Manual or by the following procedure.

1. With the ignition switch in the OFF position, press both the US/M and STEP button.
2. Turn ignition switch to the ON position. The Compass Mini-Trip Computer will perform internal checks while lighting all segments of the vacuum florescent display. Upon completion of the internal check, the Compass Mini-Trip Computer will display one of five messages;
- PASS - Passed Self Test
- FAIL - Failed Self Test
- BUS - Not receiving PCI Data Bus messages from Single Board Engine Controller (SBEC) and Body Control Module (BCM)
- bus1 - Not receiving PCI Data Bus messages from Single Board Engine Controller (SBEC)
- bus2 - Not receiving PCI Data Bus messages from Body Control Module (BCM)

If any segment of the Compass Mini-Trip Computer fails to light replace the computer.

If FAIL is displayed, repeat the test. If it still fails, replace the Compass Mini-Trip Computer module.

If a BUS(X) message is displayed, check the corresponding PCI Data Bus Circuit for proper operation. Refer to the appropriate diagnostic manual for additional diagnostics.