Theft mode

[618 Syndicate]

I'm referring to holden/brazil/mexico

The Holdens would be rhd. South American ones lhd.

Anyone know if they were sold by GM in South Africa?

 

[SUBURBAN5]

The Holdens would be rhd. South American ones lhd.

Anyone know if they were sold by GM in South Africa?

Yeah and they were specced different in brazil/ mexico. Meaning interior/airbags/grill

 

[Dariusz Salomon]

There were RHD Holden versions though, any of those around over there?

The way you worded it made me question if you knew that. Wasn't trying to be a knob.

I suppose it could potentially, but I've never heard of it happening like that, I don't think it is a constant communication between the two. It sees what it needs to see and allows the truck to start. It would be more likely to just refuse to restart the next time it was switched off.

I never took it the wrong way-like I said I appreaciate your knowledge and advice on the subject. As to Holden-that was only for Australian market-I know of 1 Holden Suburban in Scotland(or was in Scotland but since it was for sale it may have ended up in other parts of UK)-but they were never officialy sold here or rebadged-I'm sure they would rebadge it with Vauxhall if they had-just like they did with Holden Monaro and later with Commodore which was sold as Pontiac GTO and G8 in tge States,Vauxhall Monaro and VRX8 in the UK. In fact the only american car officially sold by GM in the UK was a Corvette and some offshot Cadillacs(BLS) but that in turn wasn't offered in the US. Now it's also Ford with Mustang and some small Chryslers Sebrings/Dodge Avengers-Chrysler sells a lot of their models in Europe-all Jeeps,Voyagers,Neons,Calibers and PT Cruisers(used to).

 

[mattillac]

......another question-once the truck starts as normal can the lose in communication between the passlock and the key result in the engine to cut out?

No.

There used to be document describing just that, installing a switch and purposefully opening ckt# 1836 while the vehicle is already running.

The document was here http://www.gmupfitter.com/publicat/bull/bull26.pdf but seems to have been moved.

Below is a post from https://www.the12volt.com/installbay/forum_posts.asp?tid=71772 which has most of the bulletin.

---

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.

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.

---

Way back when I used this procedure to isolate the key and column wiring from my intermittent (starts and stalls) passlock trouble, I opened circuit 1836 while the engine was running, which puts passlock into "failed enabled mode" (the light will stay on constantly when engine is running). Everything worked great for a while, truck would start and drive fine, then when it did experience a starts and stalls condition (while already in failed enabled mode, ckt 1836 already opened) again, that lead me to the theft deterrent module itself being cause of my problem (after verifying the wiring was good between the that module and VCM/ckt 1807).

This may be important info for people wanting to install a resistor as "bypass" as permanent solution to their failed lock housing or column wiring etc, ultimately the theft deterrent module still needs to be functioning properly for the resistor to work. So the resistor is not eliminating passlock altogether, far as I know, only a "tune" can truly do that.

---

Edit: found that original bulletin here.

http://web.archive.org/web/20041016001712/http://www.gmupfitter.com/publicat/bull/bull26.pdf

Thanks to the wayback machine.

 

[Dariusz Salomon]

No.

There used to be document describing just that, installing a switch and purposefully opening ckt# 1836 while the vehicle is already running.

The document was here http://www.gmupfitter.com/publicat/bull/bull26.pdf but seems to have been moved.

Below is a post from https://www.the12volt.com/installbay/forum_posts.asp?tid=71772 which has most of the bulletin.

---

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.

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.

---

Way back when I used this procedure to isolate the key and column wiring from my intermittent (starts and stalls) passlock trouble, I opened circuit 1836 while the engine was running, which puts passlock into "failed enabled mode" (the light will stay on constantly when engine is running). Everything worked great for a while, truck would start and drive fine, then when it did experience a starts and stalls condition (while already in failed enabled mode, ckt 1836 already opened) again, that lead me to the theft deterrent module itself being cause of my problem (after verifying the wiring was good between the that module and VCM/ckt 1807).

This may be important info for people wanting to install a resistor as "bypass" as permanent solution to their failed lock housing or column wiring etc, ultimately the theft deterrent module still needs to be functioning properly for the resistor to work. So the resistor is not eliminating passlock altogether, far as I know, only a "tune" can truly do that.

---

Edit: found that original bulletin here.

http://web.archive.org/web/20041016001712/http://www.gmupfitter.com/publicat/bull/bull26.pdf

Thanks to the wayback machine

That's awesome-thanks for it