GM Passlock I or II Disablement

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You can do this without adding a remote starter.

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 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/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.

Ray

Proud Member of The Anti-Passlock Club

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Re: GM Passlock I or II Disablement
Dog via CarKB.com wrote:
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I wish I could comment on this but I had better not...I'll just laugh to
myself.

--
Thank you,



"Then said I, Wisdom [is] better than strength: nevertheless the poor
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Re: GM Passlock I or II Disablement

2002 Impala Sedan having had security problem since purchasing
car-Thanks, I added a toggle switch to my plastic dash board to the
left of the the key ignition. To to get at the yellow wire I had to
remove the plastic dash board (1 piece), remove the metal plate under
sterring colume, remove 2 bolt holding key ignition, pulled ignition
key cylinder to the left and out after cutting harnesss support, splice
the wires to prewired toggle and put all back together. I disconnected
pos battery terminal prior to doing any of the work. With the passlock
in disable mode (toggle switch off) the security light stays on while
car running. This light bugs me and would like to know if anyone known
how to stop light from coming on? The the only way it goes off now is
when I enable the toggle switch to the on position when car is running
and then I disable toggle switch to off position before shutting engine
off.


--
Tomb1957
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Re: GM Passlock I or II Disablement
Tomb1957 wrote:
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Well the system can't really be disabled.  I'm surprised anyone would
put in so much work to dance around a problem rather than just fixing
the problem.

with your toggle switch off, if your car shuts off at highway speeds,
can you restart it?

--
Thank you,



"Then said I, Wisdom [is] better than strength: nevertheless the poor
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Re: GM Passlock I or II Disablement
dnoyeB wrote:
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Obviously,  you have not owned a GM with a Passlock problem. These problems
have been supposedly fixed properly time and time again by GM service techs.
A year down the road, the problems start all over again. After $400 or $500 a
pop, people are just desperate to not pour any more money into a parts
replacement marathon. By the way, here are some links to the actual documents
that the Disablement is taken from. I'm not prepared to argue with GM
engineering.

http://www.gmupfitter.com/publicat/bull/bull2wsA.pdf
and
http://www.gmupfitter.com/publicat/bull/bull26.pdf

Ray

--
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http://www.carkb.com/Uwe/Forums.aspx/car-maintenance/200603/1

Re: GM Passlock I or II Disablement

Dog via CarKB.com Wrote:
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Yep, GM's way of fixing the problem is only temporary at best.


--
ponchonutty
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Re: GM Passlock I or II Disablement
Dog via CarKB.com wrote:
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Its true.  I never owned a high enough car for the system.  I'm an
engineer but I only worked on their 3rd version of the system.  Its
really totally different technology.  Hopefully there are no such
problems with it...


--
Thank you,



"Then said I, Wisdom [is] better than strength: nevertheless the poor
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Re: GM Passlock I or II Disablement

If you followed the above way the answer is no.  The BCM is seeing
something wrong with the PK2 system and is ignoring it.  The easier way
is using a latching relay with the proper code instead of the rigging
way of using a toggle switch.  Man, thats gotta be ugly looking!


--
ponchonutty
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Re: GM Passlock I or II Disablement

Yes!:wink:  The car will restart. The previous no start (security) issue
has been resolved by cutting the yellow wire exiting the ignition key
cylinder and splicing a toggle switch to it. The steering wheel blocks
the small toggle switch and I don’t find it \"ugly\". Anyway, you state
and easier way such as \" latching relay with the proper code\" Please
take the time and explain how this is to be done. I read of soldering a
jumper wire with the correct resistor into the key recognition circuit
to make the TDM \"think\" the key is always in the ignition but never
read of any latching relay. So please take the time for the thousands
of impala readers on how this security problem can be fixed with the
latching relay.
Thank you,
Tomb1957:nono:


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Tomb1957
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Re: GM Passlock I or II Disablement

Sure.  Visit this site to get familiar with these systems
http://directed.com/guides/manuals/ig/accessories/N555L_7-02B.pdf

Once you understand the system, you can try this site and do what it
states....   http://www.designtech-intl.com/pdf/notes/note113.pdf
I will warn you that you gotta have the system working in order to get
the proper code.


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ponchonutty
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Re: GM Passlock I or II Disablement

Thank You for the links on the passlock disablement.:nono:


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Tomb1957
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