Trouble Shooting: Notes
NOTE:
VTA system or VTA system self-test will be inoperative if Powertrain Control Module (PCM), has been replaced within last 20 ignition cycles.
- System operation may be verified by entering self-test mode. To enter self-test, cycle ignition key to accessory position 3 times, leaving switch in accessory position. Once in self-test mode, headlights, park and taillights will begin flashing and horn will sound twice, verifying their operation.NOTE: Vehicles equipped with VTA are also equipped with illuminated entry. Unless illuminated entry system is disabled, it is necessary to wait 30 seconds after each door opening or closure before testing can occur.
- In self-test mode, horn will sound once after each of the following tests, indicating proper operation.
- Beginning with all doors closed, open and close each individual door. The horn will sound each time a door is opened or closed. Allow one second between opening and closing.
- Open, then close hood. Horn will sound upon opening and closing hood.
- Operate power door locks in both directions.
- Rotate key in both door lock cylinders to unlock position. Horn will sound as switch closes, and again when it opens. Allow at least one second between close and open position.
- Cycle ignition switch to RUN position. Horn will sound and also take VTA out of self-test mode.
- Activate remote keyless entry in both lock and unlock directions.
- Horn not sounding after any of the above operations indicates a switch failure, lack of input signal to VTA module or internal failure of module.
- Check for continuity at switch. Check for open or shorted wire between switch and alarm module. See appropriate wiring diagram in the WIRING DIAGRAMS article in the ENGINE PERFORMANCE section. Check if PCM has been replaced. When PCM is replaced, it is necessary to cycle ignition switch through 20 engine starts to initialize system.
- Whenever a VTA system malfunction occurs, verify wire harness is properly connected to all connectors before starting normal diagnosis and repair procedures. If security lamp comes on and remains on after ignition is turned on, CCD bus communication signal with PCM has been lost.