Question about 1999 Chevrolet Silverado 1500

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Have a P1631 DTC on my 99 chevy silverado. I know it is a theft deterant problem. How do i fix it?

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Here is a website that a free manual can be down loaded for your vehicle


http://ezinearticles.com/?Find-the-Free-Auto-Repair-Manual-You-Need-Online&id=92717

Posted on May 01, 2010

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Why is my security light coming on in my 03' chevy impala when driving im scared it will stop on me when doin tht


Hard to say why the light comes on , may have a diagnostic trouble code stored in the BCM - body control module ! Do you have a bunch of other key's on the same ring as the vehicle key ?
Passlock™ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent system prevents the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the ignition lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM). The message enables the fuel injectors and the crank relay.
The design of the Passlock™ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the passkey system. However, the Passlock™ system eliminates the need for a key mounted resistor pellet. The components of the Passlock™ system are as follows:
• The ignition lock cylinder
• The ignition switch
• The Passlock™ sensor
• The body control module (BCM)
• The SECURITY indicator
• The powertrain control module (PCM)
When anyone of these codes set the BCM will turn on the SECURITY light !
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1629
DTC P1630
DTC P1631

Your best bet , take it to a qualified repair shop an have it checked !Here are some reasons for the light to come on .
Conditions for Setting the DTC
The BCM detects a short to ground on the Passlock sensor power circuit for 1 second, with the ignition switch in the ACCESSORY, ON, or START position.
The PCM has detected a loss of the state of health serial data message from the theft deterrent system.

May 29, 2017 | Cars & Trucks

1 Answer

Need to know where the tdm is on a 1997 Cadillac deville can't get security system to shut off should I replace ecm ? Please help


It's hard to get the SECURITY light to go off when you don't know how it works ! Replacing the PCM could cause you more problems too . If a replacement PCM is being installed it must be programmed (flashed) using the latest Techline programming procedures.
Having the vehicle check for DTC ' S - diagnostic trouble codes would be the first step.
DTC P1626 Theft Deterrent Fuel Enable Signal Lost
DTC P1630 Theft Deterrent Learn Mode Active
DTC P1631 Theft Deterrent Start Enable Signal Not Correct
DTC P1632 Theft Deterrent Fuel Disable Signal Received

This anti-theft system does not use a TDM - theft deterrent module . The instrument cluster is the controlling module . Look at a wiring diagram here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model engine . Then under systems click on body & accessories , then in subsystem click on security / anti-theft . Click the search button , then on the blue link .You mite be able to do a by-pass if the contacts inside the key lock cylinder is the problem . You can check it with ohm meter . The key has a resistor pellet on the side , you can check the value with ohm meter , find the two wires under the dash at the steering column . Two white wires inside a yellow or orange sheathing . There are videos on youtube !

Apr 13, 2017 | Cadillac Cars & Trucks

1 Answer

2001 Cadillac debille security light stays on some times flashes but runs how do you find what resistanc the chip has with a meater and were you put it. to by pass


There is no resistance you can check , no place to by-pass anything . If the security light is on have it checked for DTC'S - diagnostice trouble codes . This will say what to check !

DTC B2734
DTC B2960
DTC B3031
DTC B3055
DTC P1630
DTC P1631

Autozone , napa , advance , pep boys , none of these can check for these codes , Dealer !

When an ignition key is inserted into the ignition lock cylinder, the transponder embedded in the head of the key is energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value, which is received by the theft deterrent control module. The theft deterrent control module then compares this value to a value stored in memory (learned key code). If the value is correct the theft deterrent control module sends the enable password via the serial data circuit to the powertrain control module (PCM).

Mar 24, 2017 | Cadillac Cars & Trucks

1 Answer

2002 chevy venture security problem


Yea , what would you like to know ? How to bypass it , fix rthe right way ? What ? The normal thing to do would be to take it to a qualified repair shop that has the proper diagnostic tools to check for DTC'S if any are available .

DTC 006
DTC B2734
DTC B2960
DTC B3031
DTC B3055
DTC P1626
DTC P1630
DTC P1631

Replacing modules an trying to disconnect it doesn't work , It's made so the vehicle can't be stolen . Software programmed in the vehicle control modules .

Mar 15, 2017 | 2002 Chevrolet Venture

1 Answer

Car wont start


Any new component needs to be paired with the existing components or the ECU wont recognize the new part.

Aug 02, 2014 | 1998 Buick Park Avenue

1 Answer

How do you reset the security light on a 2005 chevy cobalt?


There is no reset , if security light is lit there is a problem with the anti-theft system .Should have it checked for DTC'S - diagnostic trouble codes . Could have 8 different B - codes
DTC B0685 DTC B2955 DTC B2960 DTC B3031 DTC B3033 DTC P1626 DTC P1630 DTC P1631
You would need a professional type scan tool to read these type codes , not an OBD 2 code reader .

Apr 14, 2012 | Cars & Trucks

1 Answer

How do I reset the anti theft module in my 99 silverado 1500


leave the key in the on position for 10 minutes, then take it out and do it again for a total of 3 times..... occasionally it only takes once for 10 minutes but it shouldnt take any more than 3 times.

Jan 29, 2010 | 1998 Chevrolet Astro

1 Answer

Need code for radio anti-theft system.for a 2001 chevy silverado


You would need to go to a Chevy dealer to have to codes burned in to the vehicles computer. The reason why GM had done this was to deter theft of radios from their vehicles. The radio must have the VIN (vehicle identification number) burned into the chip to match the VIN on your vehicle so it will play

Jan 27, 2010 | 2001 Chevrolet Silverado 2500HD

1 Answer

Vehicle theft deterent moduel has issues the theft light stays on and the radio and lights dont work


check fuse and power to radio also ur key might be causing the problem or key cylinder the radio has a built in anti theft system some aftermarket and worn down keys set off the theft deterent or bad key cylinder or theft loc on radio activated have ur truck scanned some auto stores such as auto zone / advanced auto scan for free it will give u a start point

Oct 31, 2009 | 2003 Chevrolet Silverado 1500

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