Key-In Ignition Switch

Key-In Ignition Switch Test

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIRBAGS AND SEAT BELTS/AIRBAGS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. 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 steering column shrouds. Refer to Ignition Systems for the procedures. Unplug the key-in ignition switch wire harness connector from the ignition switch.
2. Check for continuity between the key-in ignition switch sense and ground terminals of the key-in ignition switch. There should be continuity with the key in the ignition lock cylinder, and no continuity with the key removed from the ignition lock cylinder. If OK, go to Step 3. If not OK, replace the faulty ignition switch assembly.
3. Open the driver door. Check for continuity between the ground circuit cavity of the key-in ignition switch wire harness connector and a good ground. There should be continuity. If OK, go to Step 4.If not OK, repair the open circuit to the driver door jamb switch as required.
4. Remove the Central Timer Module (CTM) from its mounting bracket to access the CTM wire harness connectors. Refer to Central Timer Module in the Removal and Installation of Instrument Panel Systems for the procedures. Unplug the 14-way CTM wire harness connector. Close the driver door. Check for continuity between the key-in ignition switch sense circuit cavity of the CTM wire harness connector and a good ground. There should be no continuity. If OK, go to Step 5. If not OK, repair the short circuit as required.
5. Check for continuity between the key-in ignition switch sense circuit cavities of the key-in ignition switch wire harness connector and the 14-way CTM wire harness connector. There should be continuity. If OK, test the CTM as described in this. If not OK, repair the open circuit as required.

For addtional testing please refer to Powertrain Management/Computers and Controls/Body Control Module/Testing and Inspection/ Testing and Inspection