2001 Oldsmobile Alero Security Passlock Problems

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We have been resetting this for a few months now. It has to be done 4 or 5 times a week now. I have been told that you can cut certain wires on the ignition to deactivate passlock. Also have found in my search that when you add a remote start to this car that you have to buy a GM passlock bypass interface to add to wiring, will this work without the remote start system installed? If I add a remote start system will this correct my problem?

posted by  ltooley

I can't address the remote start issue, because as far south as I live we don't have any market for installing them. As for cutting wires on the PassLock system, you have been given false information. What you can do however is determine what the resistance of the plug in your ignition key is and then substitute a resistor by removing the wires from the lock cylinder and installing the resistor inline.

Keep in mind that a difference of as little as seven ohms between what the PassLock sensor reads and what it expects to read can cause the car not to start or to even shut off while driving. It's possible that you have a loose or damaged wire causing this problem.

Without knowing what the DTC's from the BCM are, everything is shooting in the dark. Why you're attempting to figure this out without that info is beyond me. How you expect anyone to help you without that info is even more puzzling.

posted by  vwhobo

Adding a remote start system with a bypass interface or relays and resistors isn't your best option if your Passlock problem lies in intermittent problems due to bad passlock wiring connections in the terminals. Yes, you can just cut the Yellow Passlock Data Wire while the engine is running to Disable the Passlock. There is no need to add a remote starter. The best way to disable the Passlock is by adding a toggle switch into the Yellow Data Wire as described in this GM engineering report.
http://www.gmupfitter.com/publicat/bull/bull26.pdf

Here is the procedure to follow for cars:

PASSLOCK I or II DISABLEMENT

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.

CAUSE
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.

CORRECTION
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.
PASSLOCK MODIFICATION
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 http://64.85.6.118/diagrams/diagrams.asp 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.

SWITCH OPERATION

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.

NOTICE
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.

Ray:thumbs:

posted by  raycorri

I am having to reset the passlock security more often than not. Why hasent there been any kinda recall? I have noticed that where I am from there are alot of people with the same problem I have. Does anyone know what the best option is to resolve this. Thanks

posted by  tonyswife_68@ms

Hey I am a single mom wondering what to do about this pass lock system on my car too. Now why hasn't there been a recall? Recalls are for safety issues, right? What if I'm stranded out late at night with my kids and can't get my car started til my security light goes off (approx 10 minutes) A locked door isn't going to prevent an intruder getting us, is it???? Please somebody help me get a recall on this!!!

Its not only women men should see eye to eye on this too!!!!!

Thanks,
--Ginger

posted by  gmoyers

As much as I'd like to see this happen as it is such a common problem, I'd call it a stretch to say it's a safety issue. By those lines, a malfunctioning cupholder is a safety issue because the if the drink spills it could distract the driver, same with a broken CD player, or pretty much anything going wrong with the car.

I don't mean to sound like a dick, but honestly, there are bigger problems to worry about than the one in a million shot that your event will take place.

posted by  giant016

I have the same problems on my 2001 alero, and I think gm is incompetent and irresponsible. I will never buy another gm car if gm doesn’t fix (recall) this design flaw :laughing:

QUOTE=giant016]As much as I'd like to see this happen as it is such a common problem, I'd call it a stretch to say it's a safety issue. By those lines, a malfunctioning cupholder is a safety issue because the if the drink spills it could distract the driver, same with a broken CD player, or pretty much anything going wrong with the car.

I don't mean to sound like a dick, but honestly, there are bigger problems to worry about than the one in a million shot that your event will take place.[/QUOTE]

posted by  way2

Having to turn key on to acc mode for about 10 minutes, to wait for the security lite to go out, sounds like a strange fix, for something that GM should have recalled a long time ago. But atleast that seems to work, for now.

Micwel   26 Mar 2012 00:05

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