Component Tests and General Diagnostics

The CMTC is capable of performing a diagnostic self check on many of its internal functions. CMTC diagnostics may be performed using a DRB III scan tool and the proper Body Diagnostic Procedures or by the following procedure.
1. With the ignition switch in OFF position, press both US/M and the STEP button.
2. Turn ignition switch to the ON position.

The CMTC Will perform internal checks while lighting all segments of the vacuum florescent display. Upon completion of the internal check, the CMTC will display one of three messages;
- PASS
- FAIL
- CCD

If any segment of the CMTC fails to light replace the module.

If FAIL is displayed, repeat the test. If it still fails, replace the module.

If CCD is displayed, check the CCD and Body Control Module (BCM) for proper operation, refer to the appropriate diagnostic test procedures. If the CCD and the BCM are OK, replace the CMTC module.

For additional diagnostic information on the CMTC and for identifying CMTC problems, refer to the proper Body Diagnostic Procedures.