Quick Test
- As a quick diagnosis, instrument cluster will perform a function check immediately after ignition is switched to RUN/START position. Electronic display, odometer/transmission range indicator and all warning lights EXCEPT low fuel, cruise, high beam, fog lamps and turn signal will light for a brief period.
- If cluster is not receiving CCD bus messages, cluster will appear non-functional except for the continuously illuminated air bag indicator. If instrument cluster in not receiving CCD bus messages, see VEHICLE COMMUNICATIONS in BODY CONTROL COMPUTER article in the ACCESSORIES/SAFETY EQUIPMENT section.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES
article in the GENERAL INFORMATION section before disconnecting battery.
WARNING:
Disconnect negative battery cable BEFORE servicing instrument panel. When power is required for test purposes, reconnect battery for specific test purpose ONLY. After specific test is completed, disconnect negative battery cable before continuing servicing procedures.