Fixing my GM Passlock Problem Once and For All (2004 Chevrolet Impala)
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- Опубліковано 11 сер 2021
- Fixing my GM Passlock Problem Once and For All (2004 Chevrolet Impala)
The PassLock system was designed to prevent vehicle theft by disabling fuel to the engine if attempts are made to start the vehicle without the correct bitted key. PASSLock increased the level of security while retaining the ease of service and costs offered by standard ignition lock systems. Unlike the General Motors PASSKey I/II, VATS, PASSKey III, or keyless, the security of the PassLock system is built into the lock and is not dependent on a specialized key or separate device.
No programming is required for the PASSLock-equipped vehicle to accept additional keys. Any key blank with the proper profile cut to the correct depths can be used to operate the ignition lock.
For the 1995-1/2 model year, General Motors introduced PASSLock, the first ignition lock equipped with a magnet mounted into the ignition lock cylinder and a corresponding Hall-effect sensor mounted into the housing assembly. When the correctly cut key is inserted into the lock cylinder and rotated, the magnet registers on the sensor’s three switch points. The sensor electronically signals the vehicle’s on-board computer, and the fuel supply remains on if the electronic value matches the code stored in the computer.
If the values do not match, the fuel supply is shut off. After three consecutive failed attempts, PASSLock will enter Long Tamper Mode, disabling the engine for 10 minutes while the Theft System indicator on the instrument panel flashes.
The PASSLock system is designed such that forced rotation normally damages the electronics, immobilizing the vehicle. According to General Motors, should the ignition lock be force rotated, the lock must be replaced in order to operate the vehicle.
Note: The theft deterrent function of the PASSLock System locks out the fuel injectors after the engine is started. However, before a tamper mode engages, the car may run for a few seconds. The engine will then stall.
Depending upon the year and the model, replacing the ignition lock can result in the need to disassemble the dashboard. Early vehicles equipped with the modular PASSLock ignition locks had a long wire that went from the ignition switch to a connector behind the instrument panel. The modular in-dash ignition locks and the CSS ignition lock cylinders do not have wiring that must be plugged in.
When replacing a PASSLock ignition lock, there is a one in 10 chance the Hall effect sensor is the same value as the lock being replaced. Replacement locks do not have an identified sensor value. When the starter is engaged for the first time and the engine starts but stalls, the instrument panel security light will flash, indicating the vehicle is in the secure mode (it will not start) and must be programmed to accept the new lock.
Note: To avoid programming when the ignition lock needs to be replaced, use the housing of the ignition lock, which contains the Hall-effect switch. Replace only the plug. The Hall-effect switch determines the magnetic value.
To reprogram PASSLock I ignition lock:
Step 1. After replacing the lock, try to start the vehicle with a correctly cut key. There is a one in 10 chance that the car will start.
Step 2. If the new lock does not match the electronic value in the vehicle’s computer, an indicator light on the instrument panel will begin flashing and the car will be disabled.
Step 3. Leave ignition in the ON or RUN position.
Step 4. After approximately 10 minutes, the light will stop flashing and remain ON. The onboard computer has then been programmed to accept the new lock’s signal. The car can be started.
If the indicator light turns off, the vehicle is probably equipped with a PASSLock II system. Continue with the following programming procedure.
Occasionally, a PASSLock-equipped vehicle will have problems starting. The following information can help to determine the cause of the problem.
The PASSLock system does not disable the starter; it only disables the fuel after the engine has started. If the vehicle will not crank, PASSLock cannot cause this condition. If the vehicle starts, but stalls quickly, this condition can possibly be related to PASSLock.
Most PASSLock-equipped vehicles have a telltale indicator in the instrument panel. When a PASSLock-equipped vehicle is being started, the instrument panel warning light for PASSLock remains on until the engine starts. For this reason a “No Start” condition should not be confused with PASSLock System fault.
Very interesting exploration of the issue- thank you for making this video
Thank you, Randomland ! Working great so far. I did one thing differently. I added a one foot length of yellow wire & a one foot length of black wire to the yellow & black wires that go to BCM. So i can connect the yellow to the black wire together, below the dash. Where it's easier to work on. Plus, if i find the right transistor to use . I can try one without taking dash apart .
Thanks again ! 🙂
It worked on my 2004 chevy impala LS. Thank you ❤ I Also did 3 relearn programs
You are very lucky if I'm looking at the emmons on that car is Impala Indianapolis 04 please take care of it I know ain't none of my business but it is a rare car but you already know that and by the way thanks for your video I really appreciate it what you're doing for Impalas keep up the great work sir
There's nothing rare about these new cars they're all dumpster fires. Look at the s***** engineering that goes into them they even lock the owners out from starting them up that should be a recall in the lawsuit against General Motors. Go online and Google this problem the endless pages of complaints and problems with this exact system and issue. This isn't brake pads on an alternator this is something that could walk you out from starting when your life is on the line, it's planned obsolescence or if stupidity of engineering. Either way GM has to recall every one of his vehicles and make it right with a re-engineered system or just delete the system altogether.
Thanks for the video
I cut all three wires, the yellow, the white and the black. installed a 2200 ohm resistor, between, the yellow and the black wire. Then erase the security codes off the body control module to do a relearn of security system. Now do the 10 minute relearn procedure three times (when doing the relearn procedure the starter does not crank the engine) When doing the relearn procedure, the security light will flash OFF and ON for about 10 minutes then it stays ON. Then you turn the key OFF wait five seconds, turn the key to CRANK and back to ON do that three times. When the key is cycle three times the fourth time the starter will turn engine over and will start and run and the security light will go out. All doors have to be shut to relearn the security system.
Thanks for the video im gonna try this. I was iffy about putting in a resistor. I bought some but id rather do what you did. I seen this work as well on tahoes and suburbans.
I got stranded at a gas pump i usually just use my car to get my kid from school or for groceries. But when im somewhere like a gas pump or i need the car to get somewhere important it will act up. I tried starting it by jumping the starter solenoid but the fuel was cut. It would prime and run for second or 2. I would grab the throttle to try and keep going but no dice.
The most shitty problem on my car i love the car its big gets good mileage but passlock shoulda been recalled 30 years ag
Seems the gm pass lock is more of an issue than I thought. I've got 3 impala on the lot that has this issue. Did this to an 2000 chevy S10 3 weeks ago...still running....thanks for sharing
It’s very nice video I will try it now and update you. Can u tell me black and yellow wire which u put together r coming from radio or switch
I really appreciate you. It works 100%. I did the wires like you said & did the relearn 3 times & on the third try it worked.
The relearn is through the stereo?
Thanks for the kind words bro!
I have a 2000 Ls as my commuter. Has the same issue but the problem is seldom. Passlock come on maybe a few times every couple weeks. As you said, it happens mainly when I cut the ignition on and off a lot
Yeah, just enough to be a pain!
Come to find out they have a recall now 😮 going to the dealer soon ❤
Did the recall fix the issue?
The recall didn’t work on my car all they did was change out the black plastic covering on the key and told me to put it on a key ring by itself and that I had to many keys on my key chain and that why it was doing that so I did what they told me and it still didn’t work I took the car back to dealer and they said it was nothing that they could do we did what the recall called for and we can’t do anything else so now I just wait for 10 minutes when it happens and the car starts right up
My understanding of this is that all you really have to do is cut the yellow wire. make sure that you insulate the cut areas with tape or something to avoid a short.
So is the ignition pass lock sensor the problem? My 2000 Impala is doing the same thing. I thought it was the starter when this happened to me last night. I hooked my scanner up just now and found the code. Security light has been coming on and off recently.
I cut the yellow and black and connected them together on the BCM side, now the engine won't crank. Is this because I need to still do the relearn or is this another problem? I resorted to cutting the wires because I was unable to do the relearn after replacing the ignition switch despite trying for 3 hours.
Ok what do you do with the black wire going to ingnition?
Yeah mine is intermittent, I changed the ignition cylinder, I’m replace the ignition switch, the starter and the bcm and crank relay probably more then needed but I want the thing to last lol
Did you cut those wires with the car off because it wouldn't start ? Has there been issues since this original video posted ? Thanks for the video and advice hopefully it helps.
Yes, the GM passlock problem on these sometimes keeps the car from starting...tons of videos on that. And no I have had 0 problems since.
@@randomland6209 I second this!
Hello their is a recall on GM ignitions for these year Impala’s, if I get that recall done will it fix this security problem or are the issues unrelated? Thanks
Sadly the recall is a piece of plastic they put on your key to stop unintended movement of the cylinder. They don't replace anything unless the recall has changed.
What’s the purpose of the connector thing? Can you not twist the wires together?
Which wires you twisted together both wires coming from the bcm or the ones coming from the cylinder??
They both come from the lock cylinder
Did you try it?
@@BULLYGANG-wn4ws yeah but still won't start
So you twist up the same wire you clip to the same wire? Or what?
Still working for you? Might have to give this a try. I was good for for 2 months or so and now it did it to me twice today!
If you unhook battery for any reason. Like installing a new part. You'll probably have to do the relearn procedure.
Did you use the Radio Menu to turn it off?
current sitting in my impala…lights and radio work fine but when i try to start just a click and gauges/lights go crazy…so to fix just cut black and yellow and twist em together and my car should start up, right?
any update ?
I have a 05 Chevy Impala and I had just now I cut all my wires and security light stays on but it appears that it's going to work so if you want to try this you just while it's running you cut the yellow wire while it's running and and then shut it off and everything and then the security light to stay on but it'll it'll always start
What?
If I have a key with no chip will this work
For the original issue. I changed my passlock sensor because that's what I was told was wrong and I did that and relearned but after like 70 miles it's left me sit for the second time now. The security light comes on when the motor dies. Could it still be the same issue you had even tho I replaced the passlock sensor??
Yup I did the same thing it will keep coming back when you lwast expect it unless you bypass it
Least expect it*
At one-point I even got a new computer for my car waste of money !!!! they wouldn't even let me keep the old one 😒 😤
Faulty ignition switch
I had the same problem man and I found out it was a burn fuse
Which fuse?
@@joshuagreene2415 second this WHAT FUSE BRO
Must know
Is this still working did you hook the wires going to the lock together.. mine won't start at all
Is this still working?
Okay you have the yellow and black...
After you rewire the yellow and black together the only wire left to the cylinder that should be connected near the computer is the white one uncut correct it should then bypass .... Shutting the anti-system down telling that when you get done relearning it's okay to start the engine..
So essentially the only wires connected to that new cylinder and its housing of those three wires is the white one, correct...
Now I kept the door closed but my battery light along with the security system light keep flashing during the learning process even though I have did the bypass
That looks like a resistors for a Makita saw it is connected to the trigger from the main power
still working for me not a single problem anymore 🙃 other than the security light which I don't care for its not a problem , still cycles threw any problems on the cluster if there is any like low washer fluid yadda yadda
So you did this and it worked all the time ?
@@keemjonzee4813 yup it is going just fine 🙂 the resister is just for the security light
@@keemjonzee4813 this I believe is going onto month 4 of doing that fix. I lost my resistor before I did this bypass the only reason why I left the light on .
Resistor*
@@matholmes4764still work?
Did your car stay running never seen an update video im doing this now it stopped flashing and im about to turn it off and try it
I have the black and yellow wire tied together, and the security light flashes, but after a while, it goes SOLID 1st attempt fail so now im waiting for another 10 min
Si te funciono??
Did you ever have any more problems with the pass lock
Not a single one.
you can pull the switch out to have better access
With my 04 I just quit locking the car and that seemed to fix the issue.
This helped mine for awhile but it got worse and worse
Se bloqueó la trasmision q podría ser
any issues yet?
Nope. Driven it to work every day since then.
Did this work?
yes
Come from under steering wheel two screws and snaps
Can't go through radio side
so all you gotta do is cut the yellow and black wire and wire them together
My car starts but Security light is always flashing
Did you add a resister?
Be a no. Where and to what would I add a resistor too??
The service manual says you have to do the relearn 3 times, 10 minutes each. You turn the ignition on, try to start the car, if no start, leave the key on for 10 minutes or until the security light goes out. Then turn off ignition for 5 seconds, turn on and try to start the car. No start, leave the ignition on for another 10 minutes or until security light goes out. Turn off for 5 seconds, try to start. Leave key on. Repeat this one more time, leaving in for 10 minutes or until the light is out, turning off for 5 seconds. After 3 cycles of this, on the fourth try to start, the bcm should have relearned the code, and engine should start. If not, repeat the procedure for 3 cycles. I'd do it how he said, with door shut and lean in to turn the key
Yes keep the doors closed and if you don't have a resistor in the line your light won't actually go out
What if your windows won’t even go down? This is a nightmare but I really appreciate all these videos!
It’s 90 degrees outside and of course I can’t start the car to turn on the air conditioner.
Well bring some water with you and get er dun!
The service manual is right.
had the same issue... GM should have fixed the problem. Makes me so angry. No wonder why they also got sued for the defective gaskets causing engine damage or blown motors. @GM fix your crappy cars electrical issues
How do you mean
My security light is not on it just click
Did anyone try it yet? did it work?
Worked for me! :)
i will be trying it today on my 04 impala but some have already tried and it worked ive been having these problems for a while now
yeah it works on my 04 impala so far
@@matholmes4764 does it work
@@matholmes4764 does it still work brother
..
Any update
Still works fine.