02 Chevy Malibu, dissable passlock? (Page 1/1)
S-toon JUL 10, 03:56 PM
Got a 2002 Chevy Malibu V6 3.1 that have been having a problem with it starting, sometimes its good to go, and other times it just doesn't want to start, so I of course google it right lol Well anyway, found that alot of people have the same problem and that it's the passlock theft system. I also found this http://tubesound.com/2009/0...disable-passlock-ii/ tells you how to dissable the Passlock anti-theft system. Can someone that has some experince with this let me know if that might be what will have to be done. Have not been stranded anywhere yet, mostly its at home, or somewhere esle like that when it doesn't want to start.

Has anyone tried this, or have another solution?

Thanks,
GreenPlatypus JUL 10, 04:34 PM
Depends what codes are in the BCM, and when and where the fault actually occurs. I've replaced a BUNCH of passlock sensors and ignition locks becuase of this issue. Every now and again I'll have to replaced the BCM as well. There is also a theft deterrent reset procedure for the passlock, I'll see if I can dig it up in the next few minutes, that's where I would try first.

I've never been able to get the "passlock disable" to actually work. You may have better luck, I've heard of some success stories, but never seen on successfully bypassed.

Best bet, take it to a dealer or independent shop you TRUST and that has the scan tool for the passlock and have them figure it out.
PBJ JUL 13, 10:08 AM
as well as what is already mentioned, I start with a battery test because a weak battery or loose cables at battery can/will cause this concern due to voltage dropping too low during crank.

Pete

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88 3800 turbo...10 sec Quarter Mile Member.

S-toon JUL 13, 06:14 PM
Thanks for the info guys.
UCFieroCharger JUL 15, 03:16 PM
we "disabled" the paskey II system in our grand prix by removing the passkey sensor and taping the key inside it and stashing it up under the dash. we then replaced the ign lock cylinder so it could just use a normal key

when we converted the delorean to an LS1, we took the computer to a speedshop where they disabled it

[This message has been edited by UCFieroCharger (edited 07-15-2012).]

86FieroSEv6 JUL 20, 10:01 PM
On Passlock, best results will be had by trying to match the resistance of the Passlock sensor. With a good digital volt/ohm meter you measure the resistance across the yellow and black wires from the sensor with the key on/engine off, with the sensor still connected. As it is a hall effect sensor there needs to be power to measure it. Then you get a resistor or resistors to get as close as possible to the value you obtained with your measurement. Cut only the yellow and black wires and place the resistor across them on the harness side, secure the connections and if you are close enough to the original sensor resistance your car should start and run fine. If not, then you will have to perform the "long learn" procedure. The "long learn" procedure involves attempting to crank the engine, but not actually starting it. Then leave the key on until the security lamp goes out. You will do this at least three times before the new password is learned. I recommend hooking up a battery charger during the routine because if voltage falls too low during the routine, the password learn will fail. Take note, however, that there have been issues with the harness where it crosses in front of the car preventing the sending of the fuel enable signal from the BCM to the ECM. What we really need to know is what the behavior of the security light is when the problem occurs. Does it flash for three seconds? Does it continuously flash? Is it on steady? Does it come on for a few seconds, then go out? This needs to be known before hacking your car! If it has a security fail, the car should start and run for a couple of seconds then stall with the security lamp on. So check out that security lamp behavior and get back to us.
gtjoe JUL 21, 10:08 PM
The later model passlock he has does not have a resistor it has a rfid module in the key.
86FieroSEv6 JUL 21, 11:41 PM
I ain't here to cause no arguments, but the GM passlock and passlock 2 systems do not use an rfid key. They use a hall effect sensor in the ignition lock cylinder/switch assembly. These were used in the N and W body cars for many years. It replaced the older passkey system which had the resistor chip embedded in the metal key shaft. Passlock systems are easily noted by the fact that the ignition lock is in the dash rather than the column.
S-toon AUG 13, 01:02 PM
Update: It worked great, check the link that is on first post. Was happening atleast once a week,car not starting , and since doing what it says to do in the link to dissable the passlock, havent had any problems. So it really does work!
Khw AUG 18, 11:26 PM
I wonder if that would have worked on our 02 Bonneville...