Anti-Theft System Test 1A - Identifying Anti-Theft System Problems

NOTE: Perform SYMPTOM ID TEST 1A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION and WIRING DIAGRAM. See ANTI-THEFT SYSTEM article. Perform TEST VER-2A after each repair.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector. Ensure all connectors are clean and tight.

NOTE: Anti-theft system may also be referred to as VTSS (Vehicle Theft Security System).

Using scan tool, select BODY SYSTEM, then BODY COMPUTER. If scan tool displays BUS OPERATIONAL, go to next step. If scan tool displays NO RESPONSE, go to TEST 3A under VEHICLE COMMUNICATIONS. If scan tool displays any other message, go to TEST 1A under VEHICLE COMMUNICATIONS.
If anti-theft indicator light comes on while driving, go to ANTI-THEFT SYSTEM TEST 2A . If anti-theft indicator light stays on during arming process, go to ANTI-THEFT SYSTEM TEST 8A . If okay, go to next step.
Using scan tool, select MODULE DISPLAY. If module ID is not ZJ BODY BCM W/VTSS, go to ANTI-THEFT SYSTEM TEST 3A . If okay, go to next step.
Using scan tool, select THEFT ALARM. Turn ignition on. With scan tool in THEFT ALARM, select MONITOR DISPLAY. Read VTSS status. If VTSS mode is not disarmed, go to ANTI-THEFT SYSTEM TEST 1B . If scan tool displays powertrain control module 1 - NO RESPONSE/2 -NO RESPONSE, go to TEST 9A under VEHICLE COMMUNICATIONS. If okay, go to next step.
Ensure all doors are closed and properly aligned. Turn ignition off. DO NOT remove key from ignition switch. With scan tool still under THEFT ALARM, select MISCELLANEOUS, CHANGE MODE, then DIAGNOSTICS. After entering DIAGNOSTICS mode, horn should sound twice, park lights and headlights should flash, and anti-theft indicator light should flash. If the horn fails to sound, go to ANTI-THEFT SYSTEM TEST 4A . If anti-theft indicator light fails to flash, go to ANTI-THEFT SYSTEM TEST 5A . If headlights or park lights fail to flash, go to ANTI-THEFT SYSTEM TEST 6A . If okay, go to next step.
Remove key from ignition switch. Park and headlights should stop flashing. Open and close each door, liftgate and hood. Rotate key in front doors and liftgate to unlock position. Horn should sound. If horn does not sound after each action, perform indicated tests specified in ANTI-THEFT SYSTEM DIAGNOSTIC TEST DIRECTORY.

ANTI-THEFT SYSTEM DIAGNOSTIC TEST DIRECTORY

Suspected System	Perform Test No.
Left Front Door	DOOR AJAR TEST 3A
Right Front Door	DOOR AJAR TEST 5A
Right Rear Door	DOOR AJAR TEST 7A
Door Or Liftgate Key Cylinder Switch	ANTI-THEFT SYSTEM TEST 7A
Hood Switch	ANTI-THEFT SYSTEM TEST 8A
Liftgate	DOOR AJAR TEST 9A
Left Rear Door	DOOR AJAR TEST 11A