Driver Door Key Fails To Arm Or Disarm Alarm
NOTE:
After making any repairs, perform VEHICLE THEFT SECURITY SYSTEM VERIFICATION TEST
under VERIFICATION TESTS.
- Turn ignition off. Connect scan tool to Data Link Connector (DLC). Using scan tool, read DRV DOOR ARM/DISARM SW voltage. Rotate key in driver cylinder lock switch to lock and unlock positions. If scan tool displays 3.5-4.5 volts in lock position and 6.0-7.0 volts in unlock position, replace Body Control Module (BCM). If scan tool does not display 3.5-4.5 volts in lock position and 6.0-7.0 volts in unlock position, go to next step.
- Disconnect 2-pin driver cylinder lock switch connector. Connect a 12-volt test light between ground and driver cylinder lock switch connector terminal No. 2, fused B+ circuit (Pink wire). If test light illuminates, leave driver cylinder lock switch connector disconnected, and go to next step. If test light does not illuminate, repair open in Pink wire.
- Disconnect BCM connector C4. Connect 12-volt test light between battery voltage and BCM connector C4 terminal No. 13, driver cylinder lock switch MUX circuit (Light Green/Orange wire). See Figure . If test light illuminates, repair short to ground in Light Green/Orange wire. If test light does not illuminate, leave connectors disconnected, and go to next step.
- Measure resistance of driver cylinder lock switch MUX circuit (Light Green/Orange wire) between driver cylinder lock switch terminal No. 1 and BCM connector C4 terminal No. 13. If resistance is less than 5 ohms, replace driver cylinder lock switch. If resistance is 5 ohms or more, repair open in Light Green/Orange wire.