Question about 1998 Cadillac Seville
1998 DEVILLE INSTALLED NEW PCM COMPUTER BUT CAR WILL NOT START.DASH DISPLAY SHOWING: THEFT DETERRENT SYSTEM PROBLEM, CAR WILL NOT START. WHAT CAN I DO TO FIX THIS PROBLEM, AJ
U need the owners manual. it tells how to change the theft deterrent system.
Posted on Oct 07, 2009
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Posted on Jan 02, 2017
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Valet key (gray plastic end) which can start the vehicle and unlock/lock all doors, but can not unlock/lock the storage compartments, or rear compartment lid lock.
Important: The transponder values are not readable and can not be serviced separately.
Theft Deterrent Module The theft deterrent module contains the software for controlling the VTD System. The theft deterrent module uses the following inputs and outputs to control the VTD system.
Battery voltage from the underhood fuse block PCM/BATT fuse, circuit 240 (ORN).
Ignition start voltage from the ignition switch, circuit 1390 (WHT).
Ground, circuit 450 (BLK).
Outputs Password exchange with the PCM (fuel enable), class 2 message circuit 1807 (PPL).
Powertrain Control Module (PCM) The PCM verifies that the passwords received from the theft deterrent module via the class 2 serial data line are valid. If a password is invalid the PCM disables the fuel delivery system. If the password is valid the PCM enables the fuel delivery system.
Starter Relay The starter relay is controlled by the PCM module via class 2 serial data (CKT 1807 PPL). If the theft deterrent module measures the correct transponder value, the PCM module switches the starter enable control (CKT 447 YEL) to ground. The relay is energized if the ignition switch is in the START position and the gear selector is in the PARK or NEUTRAL positions.
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