Question about 1993 Cadillac Eldorado

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Need pass key decoder module part number 16150920

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The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://www.diy-gm-security.com/

Posted on May 13, 2015

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Posted on Jan 02, 2017

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1 Answer

On my 1995 Buick LeSabre, what are the symptoms of a defective ignition switch?


First off Henry ,what kind of problem are you having ? A bad ignition switch can cause a no start problem , could lose power to some other systems on the vehicle , turn signals , radio , heater . It depends what all is powered up through the switch ! Would need to look at a wiring diagram ! Powers the pass-key decoder module - for anti-theft !

Apr 30, 2015 | Buick Cars & Trucks

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How to bypass the pass key II decoder module


If you have the visible chip on the key.(that is actually a resistor) take the key to radio shack and have them measure the resistance of the key. Then buy from radio shack a resistor of the same resustance. Then under the dash coming from the column cut the small yellow wire and the black wire. Now splice your new resistor to the black and yellow wire. Your car should start. I have a video on youtube and there are plenty of others on there also.

Sep 03, 2014 | 1993 Buick LeSabre

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Ignition fuse location


The ecm fuse also powers the pass-key module on the key barrel.
See diagrams below. I recommend you probe the starter enable relay socket to see if it is getting the ground signal from the pass-key decoder whole someone tries to start the car.


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Aug 26, 2017 | 1991 Chevrolet Camaro

1 Answer

Security button to resetm pass key is located where?


your vehicle is equipped with Personal Automotive Security System (PASS-Key II(R)).
This security system is designed to prevent vehicle theft by disabling fuel system and starter unless an ignition key with a specific electrical resistance is used in the ignition key lock cylinder. PASS-Key II(R) system operates using sensing contacts, which are located in the ignition key lock cylinder. These contact a resistor pellet located in the ignition key. When lock is rotated, battery voltage is applied through appropriate fuse and resistor pellet to theft deterrent module (except Century), or body control module (Century). Pellet resistance is then compared with programmed value in the theft deterrent module or Body Control Module (BCM).
System components include ignition key, ignition key lock cylinder, theft deterrent module (except Century) or BCM (Century), theft deterrent relay and Powertrain Control Module (PCM). The PASS-Key II(R) system can also be supplied as a special equipment option on some vehicles

It will reset itself after about 10 minutes. You just have to wait until you hear a click and the pass key light goes off.
Be sure to clean the little metal strip on your key while you're waiting...


Dec 05, 2010 | 1999 Chevrolet Lumina

1 Answer

STARTS BUT SHUTS OFF IN SECONDS? LOST THE IGNITION KEY AND BROKE THE STEERING LOCK TO START THE ENGINE. 1999 CHEVY BLAZER.


When the ignition switch is turned on, the immobilizer control module sends a challenge signal through the antenna around the ignition switch to the transponder chip in the ignition key. The transponder key responds with an encrypted key code. The immobilizer module then decodes the key code and compares it to the list of registered keys. When the engine is started, the ECM sends a request to the immobilizer module over the data bus to verify the key is correct. If an attempt is made to start the vehicle with an invalid ignition key, the immobilizer module sends a message over the data bus to the instrument cluster to flash the anti-theft indicator lamp. If the ECM does not receive a "valid key" message from the immobilizer module within 2 seconds of engine start up, the ECM will disable the fuel injectors to kill the engine. You'll need to get a new key and get it registered in the immobilizer control module. You'll need a scan tool, the VIN number, the date manufactured and a factory-assigned PIN number.

Nov 18, 2010 | 1999 Chevrolet Blazer

2 Answers

I have a fuse missing and it says underneath the empty spot the word crank. it won't crank unless i put ether in the breather. will that fuse,being missing, cause my gmc not to start on its own?


The fuse marked "Crank" is usually a 10 amp fuse used for the starter enable relay circuit and the pass-key decoder module, and the starter motor should not function without that fuse unless the circuit has been by-passed. If the vehicle has a pass-key decoder module then that fuse can prevent the vehicle from starting and running.

Aug 14, 2010 | GMC Jimmy Cars & Trucks

1 Answer

I have a 94 olds 88 it has a chip in the key. i tried to jump out the starter relay now it will crank but will not start i think it has some thing to do with the pass-key decoder module but i can't find...


The dealership can bypass the security chip no problem. The chip is a resistor and they use a resistor of the same value at the bottom of the steering column to bypass. resistors and soldering are required.

Sep 22, 2009 | 1994 Oldsmobile Eighty Eight

1 Answer

Where is the pass key decoder module for 1989 pontiac firebird?


bolted to the vent box behind the center console , also check the VATS fuse in the convenience center.

Mar 31, 2009 | 1989 Pontiac Firebird

1 Answer

Engine stalls after a few seconds..'99 Venture


Does the security light flash or come on steady ? Have a lot of thing's on your key ring ? Other key's with transponder inside , Do you know what a transponder is ?

The Ignition Key (Transponder)
The ignition key for PASS-Key® III equipped vehicles is a typical ignition key using a transponder pellet located in the end of the key. The ignition key transponder value is used in order to determine if a valid ignition key is being used in order to start the vehicle. When the ignition key is inserted into the ignition cylinder and the PASS-Key® III module detects the ignition voltage (the ignition switch is in RUN or START) the module measures the transponder pellet value. The PASS-Key® III module validates this value and performs the following functions:
• If the ignition key transponder value is valid, the PASS-Key® III module performs the following (system enable) functions:
- The PASS-Key® III module sends a pulse width modulated signal to the PCM to request fuel enable.
- The PCM enables the fuel system.
- This function enables the engine to start.
• If the ignition key transponder value is invalid, the PASS-Key® performs the following (system disable) functions:
- The PASS-Key® III module does not send the fuel request signal to the PCM.
- The PCM does not enable the fuel system.
- This function does not enable the engine to start and run. The engine may start and then stall due to residual fuel in the fuel system.
The PASS-Key® III module can identify up to 10 valid key codes to operate the vehicle.

Having excess thing's on you ring , including other PASS-Key® III keys , can confuse the computers .

Mar 08, 2017 | 1999 Chevrolet Venture

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