B2948

Diagnostic Chart:

SCHEMATIC
Refer to 160/310 Cell 133: Vehicle Theft Deterrent Module schematic

CIRCUIT DESCRIPTION
The vehicle theft deterrent (VTD) controller module checks the exciter module supply circuit for a constant voltage condition.

CONDITIONS FOR RUNNING THE DTC
The VTD controller module must see the ignition switch input. The VTD can not have a B1327 DTC set as a current DTC.

CONDITIONS FOR SETTING THE DTC
The VTD controller module requires 1 second to monitor the ignition key. After the first second, the VTD controller module turns off the power to the exciter module. If the VTD controller module senses the supply to the exciter module is 12 V for 1 second, the VTD module sets this DTC.

ACTION TAKEN WHEN THE DTC SETS
The VTD controller module will "fail enable" the VTD system and allow the vehicle to start. The VTD controller module will illuminate the security indicator.

CONDITIONS FOR CLEARING THE DTC
The VTD controller module clears the current status of the DTC when it does not sense a 12 V condition on the exciter module supply circuit. The DTC will still be retrieved as current until the ignition switch is cycled. The DTC will become a history DTC at that time.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
1. Be sure that the original ignition key issued with the vehicle is used when performing the Vehicle Theft Deterrent Diagnostic System Check.
2. Make sure the good ground used is separate from the grounds used by the vehicle theft deterrent module. Voltage measurement must not interfere with possible isolated module ground.