Disabling GM Passlock on 2000 Jimmy

[XJGraham]

Hi Guys,

Does anyone know how to disable the passlock system on a 2000 Jimmy? I have disconnected the battery and now when I go to start it, it will run for a second and shut off. Any help is appreciated.

Thanks in advance

Graham

[KrAzYkRaZ]

what caused the trip of the passlock? It is reset by leaving the key in the on position for about 10-15 mins, are you sure its the passlock feature on the vehicle that is causing the malunction. (crank - no start, with security light flashing, will start after 10-15 minute time out... intermitant... key and/or remote)...disconnecting the battery should not trip the passlock anti-theft..

Chad

[blown85xj]

will most likly need to be reprogrammed

[XJGraham]

I had the battery disconnected to change the blend door motor on the heater box. After connecting it all up again all I get is a start for about 2 seconds then off. The battery wsa disconnected for 4-5 hours I would say. Is there any way of reprogramming it on my own or do I have to get the dealership to do it?

[KrAzYkRaZ]

could also be a fault in the ignition cylinder, gm has a known issue with ignition system failures whether remote start installed or not where tumblers get worn down over time and send false reading to bcm, either replace igniton assembly and relearn new code to bcm or, when truck will start without light coming on, set parking brake put truck in reverse (engine off),There are 3 Passlock wires from the key cylinder to the Body Control Module; orange/black ground reference, red/white 12 volt reference, and yellow resistance code signal (these colors are for GM trucks only). cut yellow wire and place meter positive on key side of yellow wire&ground lead to orange black, turn key to crank position and hold to get resistance read, place a resistor of that same value between org/black wire and body side of yellow wire, tape up &leave keyside of yellow wire unconnected now truck will always see the code from resistor you installed so the accuracy of r-value is important be as close as possible

Chad

[KrAzYkRaZ]

try the reset of 10-15mins with key in run position...see if that works for ya...

[XJGraham]

Thanks for all your help. I will try the reset again and see if I have any luck if not its step two with the resistor. Thanks again!!

[Noltz]

Way back when I was working at GM, this would happen on battery changes every now and again. The computer would loose the code for some unknown reason.

Put a battery charger on it, and turn the key to run (do not attempt to start). Leave for 30 mins, and then start the truck.

[C.C.]

The 30 min learn is what noltz is referring to

Attempt to crank then leave on for ten - off for two - on for ten -off for two - on for ten then when the indicator goes out the last time crank the engine.

[augiedog]

^^ c.c. gotz the answer, make sure the battery voltage doesn't drop below 10.5 either or you'll never get the relearn to work

With my car, the ignition only needed to be switched off for 10 seconds in between start attempts