Open Liftgate Fails To Trip Alarm
- Open the liftgate. With the DRBIII select: THEFT ALARM, VTSS, INPUT/OUTPUT. With the DRBIII, read the Liftgate Ajar Sw state. If the DRBIII shows: CLOSED, replace the RKE module. See REMOTE KEYLESS ENTRY MODULE under REMOVAL & INSTALLATION, then see BODY VERIFICATION TEST under VERIFICATION TESTS. If the DRBIII does not show: CLOSED, go to the next step.
- Disconnect the liftgate ajar switch connector. See Fig 1. Using a 12-volt test light connected to 12 volts, test the ground circuit for continuity. If the light illuminated, go to the next step. If the light did not illuminate, repair the liftgate ajar switch ground circuit for an open, then see VTSS VERIFICATION TEST under VERIFICATION TESTS.
- Disconnect the liftgate ajar switch connector. Connect a jumper wire between the liftgate ajar switch sense circuit and ground. With the DRBIII select: THEFT ALARM, VTSS, INPUT/OUTPUT. With the DRBIII, read the Liftgate Ajar Sw state. If the DRBIII shows: CLOSED, replace the liftgate ajar switch, then see VTSS VERIFICATION TEST under VERIFICATION TESTS. If the DRBIII does not show: CLOSED, go to the next step.
- Turn the ignition off. Disconnect the liftgate ajar switch connector. Disconnect the RKE module connector. Measure the resistance of the liftgate ajar switch sense circuit between the liftgate ajar switch connector and the RKE module connector. If the resistance is below 5 ohms, replace the remote keyless entry module. See REMOTE KEYLESS ENTRY MODULE under REMOVAL & INSTALLATION, then see BODY VERIFICATION TEST under VERIFICATION TESTS. If the resistance is above 5 ohms, repair the liftgate ajar switch sense circuit for an open, then see VTSS VERIFICATION TEST under VERIFICATION TESTS.
Courtesy of DAIMLERCHRYSLER CORP.