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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I have a passkey 3 on my 2002 cadillac deville and the security system is not letting my car start or crank does anyone know how to fix this problem i'm having without me having to take it to a dealer


You need a capable scan tool to check DTC'S - diagnostic trouble code's .
DTC B2734
DTC B2960
DTC B3031
DTC B3055
DTC P1630
DTC P1631

These would tell why the PCM - engine computer isn't starting the vehicle . There is no by-pass for this anti-theft system . The Dealer is your only hope . Nothing you can do !
The theft deterrent control module produces the theft deterrent fuel and starter enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel and starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM detects an incorrect password, vehicle theft deterrent (VTD) system failure or attempted vehicle theft, DTC P1631 is set. The engine will not start or crank as long as the condition is present.

Sep 20, 2017 | Cadillac Cars & Trucks

1 Answer

I have a 2004 Buick Rendevouz, and am having a problem with the Passkey 3 system not engaging the starter. clicks inside the vehicle at two relays and at BCM. starter works with wire to battery


How do you know it's a passkey 3 anti-theft system problem ? Light lit on the insturment cluster ? Padlock car symbol . If the security light is lit ,do you have a scan tool that can read these codes
DTC B2960
DTC B3031
DTC B3055
DTC P1626
DTC P1629
DTC P1630
DTC P1631

Not a code reader for the Engine OBD 2 codes .

Aug 23, 2017 | Buick 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

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

2007 gmc acadia - Why is there no power to the theft deterrent module / anti theft module located at ignition?


Brown wire is not for data , for ign. voltage . in run or acc. Red white wire gets it's B+ voltage from PWR MOD fuse 2 amp. I/P fuse box . Having the system check for DTC'S diagnostic trouble codes is the first step in diagnosing a no start .
DTC B3006
DTC B302A
DTC B3031
DTC B3055
DTC B3060
DTC B3935
DTC B3976
DTC P0513
DTC P0633
DTC P1631

Diagnostic Starting Point - Immobilizer
Begin the system diagnosis with the Diagnostic System Check - Vehicle. The Diagnostic System Check will provide the following information:
• The identification of the control modules which command the system
• The ability of the control modules to communicate through the serial data circuit
• The identification of any stored diagnostic trouble codes (DTCs) and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

There should be a dark green wire also ,at the theft module . This is for data communications , low speed GMLAN . Do you know what GMLAN is ? GM's version of C.A.N - controller area network . If your missing this wire , no wounder it won't start .
Theft Deterrent Control Module Pin
Wire
Circuit No.
Function
1
0.35 RD/WH
1040
Battery Positive Voltage
2
0.35 BN
4
Ignition I/II Voltage
3
0.35 BK/WH
1551
Ground
4
--
--
Not Used
5
0.35 D-GN
5060
Low Speed GMLAN Serial Data
Your best bet ,take it to the GMC dealer , there is no way to by pass this .

Aug 19, 2017 | 2007 GMC Acadia SLE

1 Answer

2002 chevy malibu...can i get a remote starter to by pass the anti theft system


What makes you think this is a anti-theft system problem ? Is the security light lit on the insturment cluster ? When you turn the key to start does the starter spin the engine ? Crank no start ! Or when you turn the key to the start position the starter does nothing . No crank no start . A aftermarket remote start won't by pass anti-theft system . Your best bet would be to take to a qualified repair shop and have it checked for DTC'S - diagnostic trouble codes . Before you let someone start hacking up wiring circuits .
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1630
DTC P1631
DTC P1632

Do you know what DTC'S are , these would point to an area of trouble an to a fix .

Aug 21, 2017 | Cars & Trucks

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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