B2947

CIRCUIT DESCRIPTION
The theft deterrent controller (VTD) module checks the theft deterrent exciter module supply circuit for a low voltage condition. If a low voltage condition is present DTC B2947 and/or DTC B3055 will set. If DTC B3055 sets alone, refer to DTC B3055.

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

CONDITIONS FOR SETTING THE DTC
If the VTD controller module senses the supply voltage to the theft deterrent exciter module is 0 V for 1 second.

ACTION TAKEN WHEN THE DTC SETS

IMPORTANT: If the theft deterrent controller (VTD) module is unable to measure the ignition key transponder value for 30 consecutive seconds, after the vehicle has started, the module will enter a fail enable state. The vehicle will not stall or stop running. If the VTD module is in a fail enable state when the ignition is turned to OFF, it will remain fail enabled until the next time the vehicle is started. If the VTD module is fail enabled, the Pass key III(R) system is NOT active and the vehicle will start. The module WILL send its enable password even if a transponder value is not received. The VTD module will remain fail enabled until the module measures a valid key transponder value.
^ The vehicle theft deterrent controller (VTD) module sends a class 2 message containing a disable password to the PCM.
^ The vehicle will not start.
^ The VTD module sends a class 2 message to the instrument cluster to illuminate the SECURITY indicator on steady.

CONDITIONS FOR CLEARING THE MIL/DTC
The VTD controller module clears the current status of the DTC when it does not sense a 0 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 Diagrams.

TEST DESCRIPTION

Steps 1-8:

The numbers below refer to the step numbers on the diagnostic table.
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.