Vehicle Theft Security System (VTSS)

A diagnostics test mode is available in the system to verify operation of all monitored switches or circuits. To enter diagnostics, use the DRB III� and the proper Body Diagnostic Procedures.

When the diagnostics test mode is activated, the horn will pulse twice to indicate that the trunk key cylinder is in its proper position. Placing the key in the ignition will allow the warning lamp, headlamps and park/tail lamps to be checked for proper flashing operation. Remove the ignition key from the ignition switch in order to check for door lock cylinder switch operation. At the completion of each of the following operations, a horn pulse will occur to indicate proper operation. Each action must be separated by a minimum of one second or horn pulse will not occur.
- Open then close each door one at a time.
- Rotate the key in each of the door lock cylinder to the unlock position.
- Cycle the ignition switch key to the ON position as the last step. A single horn pulse will indicate proper operation of the ignition switch. This will also take the system out of the stand alone diagnostic mode.

The self diagnostic mode may also be exited by using the scan tool.

When the RKE lock button is pressed, the BCM will also pulse the horn. This is part of the RKE normal operation.