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Oldsmobile Forum: bypassing the passlock or vats security
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Old March 28th, 2005
medic56 medic56 is offline
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Im trying to wire in a resistor pack so the vats security system can be bypassed. I ohmed out the key resistor and assembled the resistor pack to the same value, now I want to wire it up in the bundle but I need to know what wires to use and I don't have wiring diagram. Can somebody help me? I know I'm not the first owner to have the security light come on the dash and leave me stranded. I thank you for any help you can give
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Old April 3rd, 2005
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Get a manual, they'll have a wireing diagram for you.
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Old April 7th, 2005
medic56 medic56 is offline
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I got the wiring off the instuctions for a car alarm. Wired up and working as planned
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Old August 28th, 2005
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Location: Tampa ,Fl
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are you just tring to bypass the key or are you using a remote start i was a instaler and a mechanic for qiet awile i have done this more thna once
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Old February 25th, 2006
raycorri raycorri is offline
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Thumbs up Here's another way.....

>I know I'm not the first owner to have the security light come on the dash and leave me stranded. <

You've got that right! Here's another way to get rid of those intermittent start problems due to Passlock. You don't need to install a remote starter for this modification to work.


The following is a procedure to disable Passlock I or II Systems for vehicles in which remote start/stop system installations are required. This procedure is required because a remote start system will not function with the current Theft Deterrent System (Passlock) which is included on many 1996 and up GM vehicles.

Please note that this modification is intended to be used only in conjunction with the installation of a remote start/stop system and does not provide a procedure to install a remote start/stop system.

If an attempt is made to start a vehicle by a means other than a key rotation in the ignition switch, the Body Control Module (BCM) will interpret this start as a vehicle theft and disable the fuel injectors.

A minor wiring modification may be made to allow the vehicle to be started remotely. This modification includes adding a switch to allow the customer to select “ON” to disable Passlock or “OFF” for normal Passlock operation.

CAUTION: When this modification is performed and the switch is set to the ON position, the theft deterrent feature will be disabled. When the theft
deterrent is disabled the SECURITY or THEFT telltale will light up indicating that the theft deterrent system is NOT functioning.

Refer to appropriate GM service manuals and/or SVMQP Electrical Guideline Manual for instruction on splicing and electrical connections.
1. Select a suitable on-off switch (see note below) which will be used to disable/
enable the Passlock System. Mount the switch in a location such that it is
accessible to the driver and will not interfere with normal vehicle operation.
NOTE: This is an extremely low current circuit (approx. 7mA), it is therefore very important that a high quality, low energy, fast acting switch be utilized
for this application.
2. Turn the ignition switch to the OFF position.
3. Locate the Main Ignition Switch Harness in the Column. GM's Passlock System wires exit the Ignition Switch Tumbler together and then join with the Main Ignition Switch Harness. (See http://www.bulldogsecurity.com/ or and select your Make, Model and Year for wire colors and clues on the quickest way to access these wires.)
4. Locate the Yellow Passlock Data Wire which is included in a bundle of three tiny (20 GA) wires wrapped in friction tape.
Cut this wire and splice a 0.5mm2 (20 GA) yellow wire to each end of the cut wire.
Keep wire length to a minimum. Route modification wires clear of moving parts.
Connect the yellow wires to the switch such that the contacts are OPEN when the switch is in the ON position.
5. Turn modification switch to the OFF postion (contacts closed).
6. Start vehicle to verify normal operation. If engine “cranks but will not start"
recheck the switch position (contacts should be closed), wire connectors and
modification wiring.


To enable remote start:
Start the engine with the ignition key (modification switch must be in the OFF
position). Turn modification switch to the ON position (contacts open). The
SECURITY or THEFT telltale will light up indicating that the Passlock System is inoperative.
Once the SECURITY or THEFT telltale has been on for at least 5 seconds the vehicle can be turned off and then remotely started.

To disable remote start:
The Passlock System can be reactivated by turning the modification switch OFF(contacts closed). Vehicle can either be running or off when this is done.

Please note that the VCM/PCM will record Diagnostic Trouble Codes (DTCs) related to the security system when the modification switch is in the ON position (circuit open). This is due to the way that the VCM/PCM interprets this condition.

Any condition which removes battery power from the Vehicle Control Module/Powertrain Control Module (VCM/PCM) (e.g. dead battery, disconnected harness connectors, etc.) will prevent the vehicle from being restarted. If the engine exhibits a “cranks but will not start” symptom, place the modification switch in the OFF (contacts closed) position. This will reactivate the Passlock System and allow the vehicle to be started with the ignition key.

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Old April 22nd, 2006
S_Gibson S_Gibson is offline
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My wife's car is in the shop for the second time for the Passlock garbage. They have had it for 2 days this time and say it will be Monday before they get the part.

I bought her a 2002 GLS in December and have a 4 year warranty on it that they told me would be voided if I disable the Passlock, but I've made a backup of this post and in December of 1999 I plan to disable this garbage.

Besides the passlock, so far the only other thing I have a complaint about on her car is the location of the second cup holder in front of the shifter.

I've heard getting these problems fixed can be expensive without warranty.
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