Question about 2001 Oldsmobile Alero

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2001 alero will not start. get it towed to the shop and it starts

Happens every 2-3 months. anti-theft activated somehow at times. dashboard idiot lights on all the time even though problems not present.

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  • frank_kristo May 15, 2009

    would this cause car not to start? we get it towed to the shop and istarts right up. third time now. costing for a tow and they cant find anything wrong. they keep telling us they think it is the scurity system. any way to get around it if it happens again? if it was the fuse or relay would"nt it do it all the time?



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The security system on these cars is a mystery even to GM. If the light comes on the car is usually disabled for about 20 minutes, that is why it starts when you have it towed. First of all do you have a remote starter? If you do then utilize it and you shouldn't have a problem. If not you will need to reset the system. First, use an OEM key that has the proper chip in the key. Second, set the parking brake and turn off all accessories. Turn the key on and leave it on for 10 minutes, turn the key off for at least 10 seconds. Repeat this three times and on the third time the car should start. This resets the system and you shouldn't have any further problems. If you do you may want to get a dealer to disable the system for you so you don't have to worry about it in the future.

My security light started coming on again about a year after paying the dealership $450 to replace a faulty Ignition lock cylinder. I was at my wit’s end. My wife and kids would be stuck at night in some shopping center parking lot waiting 10 minutes to reset the stupid thing. I was able to Bypass, Disable or Ghetto Hack my passlock II anti-theft system on my 2002 Oldsmobile Alero without relays or resistors. I had my local Auto wiring tech install a $5 on/off toggle switch under my dash that is connected into the yellow (key resistance/code/recognition) wire that can be cut while the engine is running to essientially bypass passlock I(1) or II(2) permanently.(I do not have nor intend to install a remote starter and I do not have an alarm on this car.) The toggle switch idea came about because of my concern that a dealership tech could possibly reset the security “fail- enable” mode or the battery could die or become disconnected for an extended period of time and reset the intended fault. All I need to do is flip a switch to break the circuit again while the car is running to take the passlock system offline. When the system is offline, the security light is on constantly.(Not flashing.) I don’t mind the light, but others may want to remove the bulb or black it out. Here’s how the setup works:
1)Switch On while engine is running – Security system is on.(Factory Setting) Security light is off. (Circuit is complete.)
2)Switch Off while engine is running – Security system goes into “fail-enable” mode and bypasses the passlock system.. Security light is illuminated.(Circuit is broken.)
3)Switch On while engine is off – Security system is on (Factory Setting)
4)Switch Off while engine is off – Security system detects this as a theft attempt
and will not allow you to start the car until you flip the switch On to complete the circuit.(Acts as a FUEL KILL SWITCH.)
Below you will find a thread and some supporting evidence of why this bypass actually works. The entire job took 25 minutes. There is an incredible link below with high resolution pictures of the wiring for your specific car. I included the actual photos that I used to gain access to my ignition lock cylinder wiring. *Special note: those with GM Class II Data Bus should leave your radio connected during the entire procedure so nothing weird happens. If you are unsure if your car is so equipped, it’s best to leave the radio connected and let it hang. Good luck and post with your success stories! 12/4/05

 Get in your car....try to start it and find that the passlock II is screwed up again, you have to wait 10 minutes for it to reset. When it resets it starts up and runs fine?????. Fix-------Start the car, find the yellow wire that I'm sure you've read about, the rcode wire that is, and cut it. Shut off the car and you're done! The rcode wire on my 2001 alero is behind and to the left of the radio, you must take out the radio.....the yellow wire accompanies two other wires, the white and black, the 3 wires are alone and run inside what appears to be a cheap electrical tape that will fall apart in your hand when you start tugging on it, they are very thin wires, maybe 18 to 22. I taped off both ends of the yellow wire too.Took me about 14 days to find this out and reading no exageration 1000 posts. Forget all the relay, DEI and resister **** that I'm sure you've read about. All this writing assumes that this will continue to work..... page 4, The PASS Key Module also has the ability to allow engine operation if it recognizes a system fault in the ignition key reference circuit while the engine is running. In this case the Module enters and remains in a mode which allows the engine to be started and run without reading the resistance chip. This mode requires that the original factory resistance chip key be in the ignition lock
cylinder at the time the fault occurs. During this mode, the
security light will be ON all the time. When the key reference circuit is repaired, the module will automatically reprogram itself to the mode requiring the original resistance chip. page 3, 

cotd below.... as iam not able to fit the info in a single page...........
|| || || ||

Posted on May 15, 2009


    If the correct key is in the cylinder and that circuit
    fails while the engine is running, this is considered a
    malfunction, not a theft attempt. The “Security” light
    may turn on to warn of a system malfunction, but even if
    it doesn’t, a key recognition circuit failure with the proper
    key in the lock will cause the TDM to enter what GM
    calls a “fail-enable” mode. Essentially, the theft-deterrent
    system goes offline and the engine will start and run
    with any key that turns the lock. and click on vehicle wiring diagrams to select your particular make.
    Also how to disable Daytime Running Lamps
    2001 Olds Alero Locate the DRL relay in the main fuse box under the hood, it is #22 corresponding to the diagram on the underside of the fuse box cover. Remove the relay, snip pin 87, and re-insert.

    if the problem still persists.... try the following.....

    If the car is starting after you reset the passlock(anti-theft)each time then it's time for a new switch(lock cylinder with antitheft). The trick is to dissassemble the new unit and reuse your old keys and lock cylinder. This way you do not have to program the keys to the car at the stealership, that would cost you money on top of the part.Pending your keys aren't damaged.Then do the KOEO test but for 30 minutes so the anti-theft can learn the new codes. 

    You cut the RCode wire and wire a (PL2 acceptable) resistor across the the cut wire and the PL ground. A resistor that would be within the normal range for the passlock system this could be almost anything since there is a very broad range for this. When doing remote starters, I've seen these be anywhere from 1,000 to 56,000 ohms. Now this proceedure is how to replace and program a new cyl. lock yourselves without having to go to the dealer for them to "unlock" the system.

    1. Attempt to start car; it will crank and fail, with the security light flashing. Leave the ignition on for 10 minutes, until the security light goes out.

    2. Repeat step 1, two more times.

    3. Car should now have learned its new key cylinder, or in this case, new resistor.

    thank you...

    if all this doesnt work.... then u definitely need to replacwe the entire anti theft mechanism of ur car..

    good luck


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Check the anti-theft relay or fuse located in the engine compartment.

Posted on May 14, 2009


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