VTSS Test 1A - Identifying Vehicle Theft Security System VTSS) Problems

NOTE: Perform SYMPTOM ID TEST 1A before proceeding with this test. For connector terminal identification and wiring diagrams, see CONNECTOR IDENTIFICATION section in this article. Perform VERIFICATION TEST VER-1A after each repair.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

NOTE: If complaint is: VTSS indicator lamps stay on constantly (30 seconds after key is turned on) or while driving vehicle, see TEST 13A in appropriate VEHICLE COMMUNICATIONS article.

Connect scan tool to Data Link Connector (DLC) and select THEFT ALARM. If scan tool displays NO RESPONSE, perform VTSS TEST 2A. If scan tool reports a bus failure message, see appropriate BODY CONTROL COMPUTER section in this article.
Using scan tool, select BODY. Select BODY COMPUTER and then READ DTCs. If BATTERY POWER TO MODULE trouble code is present, see appropriate VEHICLE COMMUNICATIONS article. If REPAIRING LEFT VTSS DISARM CIRCUIT is present, see VTSS TEST 11A. If REPAIRING RIGHT VTSS DISARM CIRCUIT is present, see VTSS TEST 12A. Go to next step.
Using scan tool, select THEFT ALARM. Select MONITOR DISPLAY and read VTSS status. If VTSS mode is not disarmed, perform VTSS TEST 1B. If VTSS mode is disarmed, go to next step.
Turn ignition on. Using scan tool, select THEFT ALARM. Select MISCELLANEOUS and CHANGE MODE. Select DIAGNOSTICS to put VTSS in diagnostics mode. Follow instructions displayed by scan tool. If PUT IGNITION IN OFF POSITION displays, go to next step (VTSS is in diagnostics mode). If PUT IGNITION IN OFF POSITION does not display, perform VTSS TEST 3A.
When VTSS is put into diagnostics mode, horn should sound 2 times and headlights and VTSS indicator light should flash. If horn sounds 2 times and headlights and VTSS indicator light flash, go to next step. If horn does not sound, perform VTSS TEST 4A. If VTSS indicator light does not flash, perform VTSS TEST 5A. If headlights do not flash, perform VTSS TEST 6A.
With scan tool still connected to DLC, remove key from ignition switch. Open and close each door, then use key to turn each front door from lock to unlock position. If horn sounds after each action, go to step 8). If horn does not sound after each action, go to next step.

Using scan tool, select BODY. Select BODY COMPUTER and then SENSORS. Read power door lock switch voltage when power door lock switch is moved from lock to unlock position. If voltage is approximately 2.5-6.7 volts, go to next step. If voltage is not as specified, perform test indicated. See VEHICLE THEFT SECURITY SYSTEM DIAGNOSTIC TEST DIRECTORY table.

VEHICLE THEFT SECURITY SYSTEM DIAGNOSTIC TEST DIRECTORY

Problem	Perform
Left Front Door	VTSS TEST 7A
Right Front Door	VTSS TEST 7
Right Rear Door	VTSS TEST 9A
Left Rear Door	VTSS TEST 10A
Left Front Door Key Cylinder (Disarm Circuit)	VTSS TEST 11A
Right Front Door Key Cylinder (Disarm Circuit)	VTSS TEST 12A

Turn ignition switch to ON position. If horn sounds, go to next step. If horn does not sound, perform VTSS TEST 3A.
Using scan tool, select THEFT ALARM. Select MONITOR DISPLAY and read VTSS status. If VTSS status is not DISARMED, or PCM is not OK TO ARM/OK TO RUN ENGINE, go to next step. If VTSS status is DISARMED and PCM is OK TO ARM/OK TO RUN ENGINE, system is functioning properly.
If VTSS status is other than DISARMED, perform VTSS TEST 1B. If PCM status is 1) NO RESPONSE, 2) NO RESPONSE, go to TEST 13A in appropriate VEHICLE COMMUNICATIONS article. If PCM status is 1) OK TO ARM VTSS, 2) NOT OK TO RUN ENGINE, replace Powertrain Control Module (PCM). If there is a problem with RKE arm/disarm function, see VTSS TEST 7.