Door Switch: Testing and Inspection

DOOR AJAR SWITCH

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 the battery negative cable. Remove the door ajar switch from the door hinge pillar. Disconnect the cross body wire harness connector for the door ajar switch from the switch connector. Check for continuity between the door ajar switch output and the driver or passenger door ajar switch sense circuit in the door ajar switch connector. There should be continuity with the switch plunger released, and no continuity with the switch plunger depressed. If OK, go to Step 2. If not OK, replace the faulty door ajar switch.
2. Check for continuity between the door ajar switch output circuit of the cross body wire harness connector for the driver or passenger door ajar switch and a good ground. There should be continuity If OK, go to Step 3. If not OK, repair the open door ajar switch output circuit to ground as required.
3. Remove the instrument cluster from the instrument panel. Disconnect the instrument panel wire harness connector from the cluster connector receptacle on the back of the cluster housing. Check for continuity between the driver or passenger door ajar switch sense circuit of the cross body wire harness connector for the driver or passenger door ajar switch and a good ground. There should be no continuity. If OK, go to Step 4. If not OK, repair the shorted driver or passenger door ajar switch sense circuit between the door ajar switch and the instrument cluster as required.
4. Check for continuity between the driver or passenger door ajar switch sense circuit of the cross body wire harness connector for the driver or passenger door ajar switch and the instrument panel wire harness connector for the instrument cluster. There should be continuity. If not OK, repair the open driver or passenger door ajar switch sense circuit between the door ajar switch and the instrument cluster as required.