Last post on Jun 14, 2013 at 12:34 PM
You are in the Pontiac Grand Am
What is this discussion about?
Pontiac Grand Am, Security System, Sedan
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For those experiencing the security passlock problem, please see long-time member lovemygrandam's GM Security Passlock Fix tutorial.
Dec 30, 2012 (1:41 pm)
would anyone know where the passlock wire is on the ignition of a 2002 grand prix, the 2002 3.8 is different from all the other models ive looked through
Dec 30, 2012 (1:49 pm)
id like to by pass the passlock but cant locate the wires i hav the whole dash apart and steering colum so i should be able to find it, i hav a white and black striped wire and solid black on one little clip and another with a light green and peach with other various other bundles anyone that has the same please help
#1195 of 1230 I think i have a passlock issue HELP
Feb 15, 2013 (11:47 am)
Hi. Hope some one can help me out.
I have a 2003 pontiac grand am. Car start a day before but now it just turn and won't start. I did the 10 min thing and the learning procedure but still no luck.
My car security light is lid and stay lid when the key is turn to the ON position. After 10-15 minute in the "ON" position, the security light remains lid. shouldn't it turned off?
I also try the learning procedure.... Turn the key on...then turn to crank the ignition..won't start. The security light goes off when its back to the "ON " position. Should the light stay lid?
Just a note ...My security light does not flashes. Any suggestions?
#1196 of 1230 Re: I think i have a passlock issue HELP [sam20777]
Feb 15, 2013 (1:01 pm)
did u turn the key all the way back past the off position after reseting the passlock
#1197 of 1230 Re: I think i have a passlock issue HELP [sam20777]
Feb 15, 2013 (2:28 pm)
Go to http://bergerweb.net/PasslockFix
There are some tips at the bottom of that article on troubleshooting your system. It sounds like you might have a short or an open in one of the wires between the passlock module and the BCM. Good luck.
#1198 of 1230 Re: I think i have a passlock issue HELP [sam20777]
Feb 15, 2013 (5:15 pm)
My 2004 Alero which uses the same parts had an issue with the ignition switch. You could actually pull out the key with the engine running. The switch was replaced a few months ago and no problems since. Could be a pass lock problem along with a BCM under the glove box.
#1199 of 1230 Re: I think i have a passlock issue HELP [jlsumme]
Feb 17, 2013 (8:16 pm)
I don't think I would have gone to the expense of replacing the ignition switch just because I could pull the key out of the ignition. Many cars in the 50's and 60's were manufactured that way. Even so, this would have nothing to do with passlock, since this is a mechanical function, not electrical.
#1200 of 1230 Re: I think i have a passlock issue HELP [lovemygrandam]
Feb 18, 2013 (9:10 am)
In the 2004 alero it has the pass lock 2 witch does not have the sensor on the key. It instead has the sensor in the ignition switch assembly and when the tumblers or something else inside the switch get really loose or worn the sensor does not send the correct resistance to the bcm which in turn shuts down the fuel injectors.
#1201 of 1230 Re: I think i have a passlock issue HELP [jlsumme]
Feb 18, 2013 (2:47 pm)
Actually, what you say is true of all of the following cars:
1999 - 2004 Oldsmobile Alero
1997 - 2003 Chevrolet Malibu
1999 - 2004 Pontiac Grand Am
They all are equipped with Passlock II systems, and do not require a key with an embedded resistor. In these models, the resistor is embedded in a module that is molded into the side of the tumbler mechanism, This resistor is activated into the passlock circuit when any key is used to turn the locking mechanism. When the resistor is activated, a voltage between 1.5 and 9 volts will be present on the yellow wire [circuit #1836]. If the voltage is not what is expected by the BCM, then the bcm will begin flashing the "Security" light, and will not send the correct code to the Powertrain Control Mocule. In turn, the Powertrain Control Module will deactivate the fuel injectors, causing the engine to shut down.
If the voltage on the yellow wire is within the allowable range, the vehicle can then be left in the ON position, and the BCM will, after 10 minutes, remember the new voltage, and will shut off the "Security" light. If you then turn the ignition off for 5 seconds, and then try to re-start the vehicle, the Security light will remain off, and the car will start.
If for some reason, the voltage on the yellow wire is not within the tolerable range, the "Security" light will then stay illuminated solid [not blinking]. If the relearn procedure does not work, the solid "Security" light indicates that the yellow wire is either broken, or shorted to something else in the wiring harness.
That's about all there is to the circuit.
1. "Security" light off - Everything working correctly
2. "Security" light blinking - Wrong voltage. needs relearn procecure
3. "Security" light ON - Short or open in the wiring
4. "Security" light ON but car starts - Faulty wiring, and Passlock system is in bypass mode. Bypass mode will remain until battery is disconnected or discharged, at which time Passlock system will cause the injectors to be de-activated.
Instrumentation Engineering (retired)
General Motors Proving Ground
Feb 21, 2013 (1:51 pm)
re: to dick berger light is blinking when door is open , put key in ignition start car no light at all, driving and car shuts off. reset passlock runs battery dead even without the lights on,half charged the battery and the alternator charged it the rest of the way full could a battery set off the passlock system if it drops below 12 volts