VTSS Test 7A - Repairing Defective Anti-Theft System Disarm Circuit
NOTE:
Perform VTSS TEST 1A
before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION
. For wiring diagrams, refer to WIRING DIAGRAMS
. Refer to ANTI-THEFT SYSTEM
article. After each repair, perform TEST VER-2A
.
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting any module connector. Ensure all connectors are clean and tight.
- If 3 door key cylinder switches fail to disarm alarm, go to step 4). If 3 door key cylinder switches do not fail to disarm alarm, disconnect appropriate door key cylinder switch connector.
- Using scan tool in voltmeter mode, measure voltage at terminal No. 1 (Violet/Yellow wire) on door/liftgate key cylinder switch connector. If voltage is less than 10 volts, repair open in Violet/Yellow wire. If voltage is 10 volts or more, go to next step.
- Using scan tool in ohmmeter mode, measure resistance at terminal No. 2 (Black wire) on door/liftgate key cylinder switch connector. If resistance is more than 30 ohms, repair open in Black wire. If resistance is 30 ohms or less, replace defective door/liftgate key cylinder switch.
- Using scan tool in voltmeter mode, backprobe terminal No. 10 (Violet/Yellow wire) on Body Control Module (BCM) Black 14-pin connector. Do not disconnect BCM connector. BCM is located under left side of dash. If voltage is less than 10 volts, replace BCM. If voltage 10 volts or more, repair open in Violet/Yellow wire.