Passlock I and II Simple Fix

Just to dig up an old bone............

https://www.the12volt.com/installbay/forum_posts.asp?tid=59694&KW=Passlock&tpn=1

You guys that used this fix may want to add this Modification Switch since this bulletin from GM Engineering suggests that a battery disconnect will cause the PCM to reset the Passlock.(ie.-clear out the intended "fail-enable" mode. The Yellow Data Wire Circuit will need to be complete again before you can restart.) You will experience "no-start" conditions all over again. This first link is for GM trucks and vans.

http://www.gmupfitter.com/publicat/bull/bull26.pdf

And here is a rewrite so that we can apply this to GM 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 allow remote starting 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/THEFT SYSTEM  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 isaccessible 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 utilizedfor 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  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 andmodification wiring.

SWITCH OPERATION

To enable remote start:

Start the engine with the ignition key (modification switch must be in the OFFposition). Turn modification switch to the ON position (contacts open). TheSECURITY/THEFT SYSTEM Telltale will light up indicating that the Passlock System is inoperative.Once the SECURITY/THEFT SYSTEM 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.

Hope this helps some of you!

Ray

well I already did just that so the problem is with the pk2 so i'll just try the fix and see how it works for me.  however, with the pk3 issue I notice it had the same issue you were speaking of with the pk2 before the remote start system was ever installed and I know the pk3 system also has a data wire thats why I was wondering if it could be handled in the same way, but if you don't know, you don't know I appreciate the help on the pk2 though.

purple....Sammy