I have determined that the module is bad and bought a replacement, but I cannot find the module in the car. A picture or graphic of the location would be helpful.
How did you determine that ? Have a factory scan tool an check data parameters ? Do electrical testing ? If you don't know where it is how could possiably test it . The most common problems with this anti-theft system is that the wires coming from the ignition switch break . There are contacts inside the ignition cylinder that read the resistance of the pellet on the key . If you look under the dash on or around the steering column ,find wiring for the ignition lock cylinder . Should have two white wires inside a yellow or orange sheathing . Check resistance of the pellet on the key ! Stick the key in the ignition ,now check resistance at the wires . If read no resistance , a wire is open . You can buy a resistor of same value an solder into the harness . Not the ignition cylinder side .
Testimonial: "I read the resistance of the key and put a bypass resistor in its place. Security light still on and car wouldn't start. Next day it did start and security light was off. Two days later no start."
"I read the resistance of the key and put a bypass resistor in its place. Security light still on and car wouldn't start. Next day it did start and security light was off. Two days later no start."
Two days later no start." was the security light on again ?
Pass-Key II® Theft Deterrent Module
Under the right side of the IP, near the rear of the IP compartment
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Yes security light on. I cannot see the module behind the dash . What has to come out to see the module?I pulled the glove box out. It has a passenger side air bag. Does that have to come out? Today it started with no light.
Try behind the right side kick panel too .
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The CTD system requests the IPC to illuminate the indicator only when the ignition switch is OFF. The CTD system uses the indicator in order to identify system status. For specific CTD condition that will illuminate the security indicator, refer to Content Theft Deterrent (CTD) Description and Operation .
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The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
SERVICE THEFT SYSTEM
The radio illuminates the SERVICE THEFT SYSTEM message when the VTD system detects a failure. The radio receives a message from the theft deterrent control module via the serial data circuit requesting illumination.
This is one you need to take to the dealer , unless you have a GM factory scan tool !
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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.
Inputs
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Battery voltage from the underhood fuse block PCM/BATT fuse, circuit 240 (ORN).
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Ignition start voltage from the ignition switch, circuit 1390 (WHT).
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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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