Initial Inspection and Diagnostic Overview

CCM Diagnostic Mode:

Driver Information Center Buttons:

The Central Control Module (CCM) utilizes the speedometer, odometer, and the trip monitor located on the instrument cluster to display information while in the diagnostic mode.

The speedometer is used to display malfunction codes (both CCM and ECM), the odometer displays data, and the trip monitor indicates the system being tested and the test which is being performed. (See the illustration). The buttons on the Driver Information Center (DIC) are used to send instructions to the CCM when in the diagnostic mode.

Unlike other vehicle electronic systems, such as ECM, ABS, SIR, etc., there is no specific "CCM" lamp to indicate a fault. A code-setting fault in any of the CCM-monitored systems is indicated by "SYS" (SYSTEM ERROR) flashing in the instrument cluster trip monitor. If a fault does not recur within 100 ignition cycles the CCM will automatically clear the code.

The "SYS" indicator will flash 3 times every 15 seconds while a fault is present. An exception to the "SYS" fault indicator is that VATS (PASS-Key) faults (Codes 51-54) will be indicated by the "SECURITY" lamp being illuminated, rather than the "SYS" indicator flashing.