B2948

DTC B2948

CIRCUIT DESCRIPTION
The theft deterrent control module checks the theft deterrent exciter module supply circuit for a constant voltage condition.

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

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

ACTION TAKEN WHEN THE DTC SETS

IMPORTANT: The theft deterrent control module will enter fail enable state. The vehicle will not stall or stop running. If the theft deterrent control module is in a fail enable state when the ignition is turned to OFF, it will remain fail enable until the next time the vehicle is started. If the theft deterrent control module is fail enabled, the vehicle theft deterrent (VTD) system is NOT active and the vehicle will start.
- Stores DTC B2948
- The theft deterrent control module sends a class 2 message to the instrument cluster to illuminate the SECURITY indicator.

CONDITIONS FOR CLEARING THE MIL/DTC
The theft deterrent control module clears the current status of the DTC when it does not sense a 12 V condition on the theft deterrent 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.

DIAGNOSTIC AIDS
Refer to Testing for Intermittent and Poor Connections and Testing for Electrical Intermittents in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-8:

The number below refers to the step number on the diagnostic table.
2. Make sure the good ground used is separate from the grounds used by the theft deterrent control module. Voltage measurement must not interfere with possible isolated module ground.