Diagnostic Aids

Instrument actuator test will put instrument cluster into self-diagnostic mode. In this mode, instrument cluster will position each gauge needle at specified calibration points, and turn all Chrysler Collision Detection (CCD) data bus message-controlled indicators on and off at specified time intervals. See Figure or Figure . Successful completion of actuator test will confirm instrument cluster circuitry, gauges and indicators are capable of operating properly. If test is successful, a problem may still exist with CCD data bus, Powertrain Control Module (PCM), Air Bag Control Module (ACM), Sentry Key Immobilizer Module (SKIM) or inputs to one of these modules. See BODY CONTROL MODULES - CHEROKEE article.

If an individual gauge does not respond properly or at all during actuator test, remove instrument cluster. Check tightness of suspect gauge mounting screws on printed circuit board. If screws are loose, reinstall instrument cluster and retest. If screws are tight, replace instrument cluster. If an individual indicator does not illuminate during actuator test, remove instrument cluster. Check indicator bulb and bulb holder. Repair as necessary and retest. If indicator bulb is okay and bulb holder is installed properly, replace instrument cluster.