Chime Warning Request Diagnosis

Chime Warning Request Diagnosis
Before performing this test, complete the testing of the seat belt switch Seat Belt Buckle Switchand the Central Timer Module (CTM) Body Control Module.

The diagnosis found here consists of confirming the viability of the hard wired tone request circuit between the instrument cluster and the Central Timer Module (CTM). For diagnosis of the CCD data bus Information Bus and the data bus message inputs that cause the instrument cluster to issue a request for chime service, a DRB III scan tool is required. Refer to the appropriate diagnostic information.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

1. Disconnect and isolate the battery negative cable. Remove the instrument cluster from the instrument panel. Move the CTM away from its mounting bracket far enough to access the instrument panel wire harness connector(s) for the CTM. Disconnect the instrument panel wire harness connector (Connector C1) from the CTM connector receptacle.

2. Check for continuity between the tone request circuit cavity of the instrument panel wire harness connector (Connector C2) for the instrument cluster and a good ground. There should be no continuity.
If OK, go to Step 3.
If not OK, repair the shorted tone request circuit between the instrument cluster and the CTM as required.

3. Check for continuity between the tone request circuit cavities of the instrument panel wire harness connector (Connector C2) for the instrument cluster and the instrument panel wire harness connector (Connector C1) for the CTM. There should be continuity.
If OK, replace the faulty instrument cluster.
If not OK, repair the open tone request circuit between the instrument cluster and the CTM as required.