How to troubleshoot/bypass a GM VATS Passlock Passkey System
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- Опубликовано: 10 июл 2017
- In this video I will show you how to troubleshoot and repair or bypass if you wish, a GM anti-theft system that has a resistor "pellet" in the key.
Dashboard messages "Theft System Problem", "Car may not restart", "Starting Disabled Due To Theft System"
Tools used
- Milwaukee 2456-20 M12 1/4 Ratchet tool Only (Substitute to what I used)
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- Milwaukee 48-11-2401 (2) M12 RED LITHIUM 2.0 12-Volt Lithium-ion Cordless Battery and (1) 48-59-2401 12Volt Lithium Battery Charger NEW
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- uTest Advanced Terminal Test Kit
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- Irwin 2078300 8" Self-Adjusted Wire Stripper
www.jbtoolsales.com/irwin-207...
- Portasol SP-1K Soldering Iron, Cordless Butane
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- Deluxe DMM w/Amp Shutters (substitute to the Vantage I used)
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC. 
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"PROBLEM SOLVED" after days of trouble. SPRAYED CRC "Electronic Spray" ($3 at Walmart) into my "aging ignition." (Electronic spray will not hurt the "dusty old" ignition). Unbelievable! "1998" Chevy Cavalier 2.2L engine. Chevy wanted $300 for a reset. Had it towed several times and local mechanics tried everything. Found this $3 CRC spray solution in a forum. "Security light" kept coming on. Stalled in traffic. Had to wait to start again. Looked at all the "bypass solutions" and Amazon gadgets too. When it works for you remember to share and pay-it-forward.
Yeah Paul, the old cars are interesting too, glad you decided to film.
Travelingman 1997 Yeah and not everyone owns newer vehicles. It's good to have repair & diagnosis info/procedures on all types of vehicles.
Ive been employed as an auto technician for 17 years now. Paul could upload a video on checking his tire pressure and id still watch it. Dont care what its about, reg channel or premium, thankful for all of it.
HEAR HEAR - I agree 100%!
I watched this video for the first time last week and what do I get in today? A vehicle that the customer replaced the battery, starter and electrical portion of the ignition switch and it still wouldn't start. First thing I check for is flashing security light, it's there. Used this bypass method and within 10 minutes had the car running. Thanks for another great video, Paul
In this video Dr. Scanner Danner shows us how to perform an automotive anti-theft vasectomy. My '93 Corvette shares the same anti-theft anatomy as the Caddy. Well done vid again!
Every time you have to make a decision to film or not, just think of the smile on my face when that car started! I love fixes that don't involve changing parts. Just plain cool. Thanks for the explanation at the end, invaluable information Paul.
Good video Paul. I love seeing the old cars too. Working on them is going to be a lost art if nobody shows them. The way this circuit works is also very similar to older steering wheel controls and cruise control switches. There is a 5 volt and a signal return line hooked to the BCM or cluster, going through the clock spring, and each button has its own resistor value. A cheap way to have many buttons only use 2 wires.
Great video as usual Paul. I've installed a number of the various kinds of Intoxi-Lock systems that are court ordered with some DUI violations. They interrupt the start circuit and only enable it when the unit detects a passed test from the handheld unit that the driver blows into to test for alcohol. It looked like the vehicle had one of those systems that had since been removed.
Did this on my daughter's 95 Buick. EXCELLENT video.
Great video Danner! I did the same thing to a 90's Buick years back but I wasn't nearly as quick as figuring it out as you were! I didn't think to measure the key's resistance. I bought a hand full of resistors and tried them until it started.
As a locksmith I have been working on these systems for years. Several suggestions. First you have to remember that there is a penalty delay after any failed start attempt. (3-4minutes) next, there is a stand alone module that verifies the correct pellet value. This module seldom fails, most failures are in the wires bet ween the ignition cylinder and the connector undre the dash.
Easiest test on the wire integrity is to unplug the connector and measure the ohms between the 2 pins with the white wires in the orange cable. Chek with no key in, (should read open) then just insert the key (should read about the same as the measured resistance of the pellet on the key. Another common issue is dirty contacts in the ignition cylinder. This will read as a lot higher resistance.
With this test, you can narrow down things real quick.
I was thinking that might work to check it. Thanks for verifying my thoughts on it. I will try that to see if the key is sending out the right signal.
I've had bad ecms too.
Dude you are just killing it recently man! I love going on mobile calls with you. These videos are so informative and top notch editing!
Thanks man! It doesn't feel like it at times. So much great competition now these days, don't you agree? (you being one of them ;-))
I really appreciate your comment and support and wish you and your channel all the best as well. I think we all bring a unique way of doing things and it makes our subscribers that much better. Have a blessed day my friend.
absolutely, he has a great niche.....
FordTechMakuloco ......are you guys serious? I watch and follow both of you. I used to teach jet engine/acft engine theory troubleshooting and repair and yet these are the jobs I wished I was doing.
Thanks for following what we are doing Timothy!
I agree on the competition there are many greats that have come on board recently and its even tougher on social media everyone is posting everyday sometimes more. Just a few months ago no one really put much emphasis on it. I wish all the great techs on youtube could get together for some event and diagnose something or at least get a picture together this is truly history in the making and we are all part of it!
Best video of repair I've looked at. Thank you!
love the video. as a automotive student who just graduated, im deffinantly considering supporting your priemium channel in the future. thanks for the all the free informative videos
will be the best $10 a month you will spend, but buy the book as well.
I have a similar problem on my son’s 98 camaro. Whether this is the fix I am looking for or not it saved me a ton of time in troubleshooting and figuring out what wires do what. Thanks for showing this!
Unfortunately, not my problem. Still searching for a solution. Was just told by the person I bought it from that someone “borrowed” some fuses out of it. SMH!
Thank you for the information and thank you for explaining every thing so well.
I lost the key to my 97 Lumina went to the dealer gave him the VIN number charge me $50 for a new key. key was cut right so it turned the cylinder car would start for Split Second then cut off. had the wrong pallet in there and they would not refund my money. so I got a volume control knob Off an old CB radio began with it turned all the way down try to start it and incrementally turned the knob up and it started so I measured the resistance value of the volume control knob at the position the car would start at. went down to Radio Shack matched up with the resistor of the proper value and was back in business. come to find out GM Vats had like 15 different possible resistor pellets during those years. shade tree mechanic way of doing it if you don't possess all the proper tools like scannerdanner has and you did not have the key in the first place to measure the pellet
08 silverado lgnition replace
The mighty engineer !
Every day something new thanks Paul Danner
Just did two remote starts a couple months ago with this system. Still good info from a reputable source. A remote start bypasses this problem also, if you happen to be in the market for one when this happens.
Excellent job and review Paul. Never stop learning!!
Thanks jake!
Great fix Paul, Keep bringing us with you.
Now we know why your the teacher and we the students. Nice job Paul!!!
DUDE, I've been waiting all my life for 2 things, (1) A good woman and(2) a trick like that. NICE!
I got the same system in my trans am. Just subbed and watched a no spark video. It will help me later with testing my no spark issue. Really enjoy your vids man 👍up ✌️
Great video!!..You, are the Source!!..Maybe too much for the average repair guy, but I enjoyed your detailed description, and was able to follow you on it!!!..I will use this if it fixes my problem...Thanks for the mini-electronics course!!!...Great!!!
Thanks for a utterly good presentation indeed Sir, Ted instructor/educator
I dealt with a similar issue on my SRT8 Jeep a few weeks ago. The hood sensor/switch that prevents the remote start from working when the hood is open, utilized a 1k ohm resistor. I used shrink tube on each leg of the resistor and then put a 3rd piece of marine grade shrink tube over the entire thing. That thing should never require servicing again and now I can remote start with my hood up since I bypassed the switch/sensor completely!
I hate to admit that i use to install aftermarket equipment. I tried to do the best/cleanest job I could..BUT I've seen too many butched up installs. when I went into full time auto repair I cursed the aftermarket guys without mercy.thanks for the video Paul. brought back alot of memories (some bad)..cheers
Hey Mister Danner you're really good technician thank you for all your help, god bless you. Im a spanishs speaker and just to let you know you are really famous on our community thanks for your help.
Keep showing old school stuff. Out west we like our old cars so we keep them running any way we can :)
Awesome video👍🏻. I am glad you took the time to film. Thanks Paul.
thank you!
Paul, more than likely the passlock sensor wire is broke @ the lock cylinder, another top drawer video as always!
i NEED that kit. Great vid to a common problem
👍 THANK YOU SO MUCH FROM FRANCE 🇫🇷 👍👍👍 Helped a lot (not many Cadillac dealers here....)
Great !!! 😀 😊
Great vid thank you for making everything so clear. Im just wiring in the spare key as the resistor for my 95 Eldorado. I suppose if it does work I will later wire in a resistor...
there are lots of handy resistor apps available for almost any smart phone. good video. done many of these myself. I usually scavenge potentiometers from old electronics and dial in what I need.
Great vid man! I imagine the security keys have saved a few cars but I have despised them since the first time I got a key made that wouldn't crank my truck. I called Ford to buy a spare and it was like 300 bucks back then. How could I have possibly been happy with that? Its probably parked plenty a car too for a while. I bet folks have given up and sold cars over security key issue.
You are THE man Dan...Great vid bud !
ScannerDanner is a genius.
Old car or not, the principles are the same. Great video Paul
Regarding the Eldorado, I find them a very comfortable and reliable ride, however, because it has some age to it you dismiss it.
If maintained properly they will give one good service and are much less complicated compared to the new junk they
sell today.. Nice job on the diagnosis.
Excellent...insightful and educational, many thanks...!
You didn't complete the job.
You need to go back and replace the Pine Tree air freshener also.
hey like that soldering iron i use the same for many years
Nice work Paul.
My 1997 Deville has the same problem thanks for the help.
Love the videos you make, very informative
Great video Paul
BROTHER, YOU DID AN AWESOME JOB ON THIS! IM GONNA CHECK OUT YOUR WEBSITE IN JUST A MINUTE.
I am a remote start tech..I approve of this fix. You can also do it on the aging passlock 2 system. Cut the yellow wire, measure the key side to the passlock ground, and then match it from the car side of yellow to passlock ground. :) You may get errors in the immobilizer system but it will always start. I usually solder in a new wire and tape a wire tie around it as a splint to keep it more stable under the dash!
Thanks James!
Yes that is correct you can use any of the preset values. Look on ebay they sell specific kits of 10 resistors for GM vats/passlock. I forgot to mention using my method the engine must be running when the yellow wire is cut. It also has a default strategy of if the wire is cut when the engine is running it will go into failsafe and ignore passlock but the light will stay on to let you know the system needs serviced.
This was actually how GM did their "factory" remote starts back in the day.
My camaro uses the same ignition system so Ill prob end up doing this one day lol Those wire strippers look real good if you're in a large area. Thanks for the vid Paul, - Matt
Hi i have same Cadillac same problem this video help my worry well thanks .
good job keep up the great work bro
Amen love it keep up the good work
nice.. i got it. thanks a lot sir paul.
Even the old stuff!!! My 97 Buick has a security light on! Now, I know what that means!! YOU DA MAN, SCAN!!
Paul , i think this video is got me on the right track , i got a 2000 3500 utility box bucket truck from a local cable company it had a tracker in it , they pulled it when the boon lines blew out , it still ran , but it has wiring gremlins , this darn truck has been to every shop in town , they all got 300 dollars , but its still blows the prnd after it warms up , about 3 to 8 miles ..ive been fighting this too long , would you like a paid trip to florida ? Ive had it with this problem ..i got boats too ..hogs , deer oceola turkey's ,and one rustic as hell camp site ..if any of that sweetens the deal ..
That circuit is a simple resistive divider using the voltage divider equation you can determine the value of the resistor inside the PCM.
R1 = R2 * (Vin / Vout) - 1
Where R1 is the resistor inside the PCM, R2 is the resistor in the key (rounded to the nearest standard 5% resistor value), Vin is the voltage measured with the key removed (the voltage reference), and Vout is the voltage measured with the key inserted.
R1 = 1,100 * (5 / 1.6) - 1
R1 = 2,337 kilo ohms
The nearest 5% tolerance standard resistor value (E24 value) to 2,337 kilo ohms is 2,400 K so that's what you would find inside the PCM.
When selecting a resistor after measuring the key it helps if you have a list of the EIA E24 standard resistor values. It lists all of the standard resistors in the 5% tolerance range so you can see what standard value is closest to what you measured.
www.ohmslawcalculator.com/e24-resistor-sizes
That's a vary common issue and repair on GM vehicles with VATS. Eldorado, DeVille, Seville, Corvette and any GM vehicle with the pellet in the key. Some people prefer to replace the ignition switch because they want to keep the car as original as possible even though it costs more to replace the switch instead of using a resistor. Many of those people are also 60+ years old and think putting in a resistor will harm the car even though we explain doing so will not.
This guy is a pro.
Thanks for the information. My 1995 chey. Caprice is doing this. Waiting on resistor kit. To arrive. Then I will have it back on the road.
Very good job 👍👍👍👍
Nice video 👌👌👌👌
You teaching very good you good teacher
Thank you!
You are the man.
Hey Scanner thanks for the reply to my question. What are your thoughts on an Autel maxipro 808, Stephen Cox had a video of it for $699 on Amazon.
Cool. Subscribed. Thank You.
A few years before this system they had two wires for theft detterant that turned when the key turned , i learned to buy a new switch , they would just break again ( michigan weather , hard on moving little wire ) so i bought another new one , stuffed the original key in it zip tied in the steering column and used the broken ignition from then on ..the wires didnt turn with the key no more ..
Bravissimo!!! Bye bye Italy Turin
VERY HELPFUL
Beautiful explanation my man. I’m an automotive locksmith and this info is golden. A lot of people in my area pass these up when ask keys lost.
Very interesting and like how you think things through to fix a problem. I would like to know if there is an affordable scan tool that a diy person can afford, I am a retired person who has experience working on most types of vehicles and try to do repairs for people who cannot afford the dealership fees and some shops, but a scan tool would make life a little easier. Keep up the good work.
Robert, it really depends on the type of work you want to do and what market you are in. There really isn't one particular tool I can recommend. BUT, I do recommend that you get a scan tool that offers bi-directional controls, which will put you in the $1000 range at a minimum.
Great info, thanks, got your book
Thank you Glen!
There a company called New Rockies. They sell aftermarket modules for Gm and Gm only for all security Full bypass. Some security module's send a pulse width signal to the pcm to keep the injectors pulsing. This module produces the signal the pcm needs. Just installed 1 on a 93 Deville. Rolling on.
Haha, yup! Such a common problem that most of the GM cars from that era already have this done! Not long after this Passkey system came out, thieves started carrying around resister packs and could just hotwire the thing in a heartbeat.
Or the smart ones made a simple box with the proper resistors and clipped it in with a couple wire piercing clips.
Thank you, informative. Now then, how is the hot wire identified? I have a blue wire from the PCM , and it's designated "antitheft". Problem: I removed the entire drive, cut the PCM wire, so I have the basic engine sensors and the PCM to manage fuel. The wiring is 90% finished. I'm fairly certain it is correct. The fuel pump feed comes on for 2seconds than shuts off, but the engine will continue to crank. Which is correct, although the crankshaft sensor is still sending a signal, as I have an led in parallel. What am I missing? I don't have any potential feeding my ICS, and my OIL LEVEL sensor is still disconnected, and I don't know if I need the oil level monitor to complete. Help
Nice information
Hey! If you have a smart phone, they have an app for resistors that you can dial in the colors or the value and it will tell you what you have/need. I've done a similar fix for some pontiacs. I also don't know the color bands lol.
Hey Paul. I love your videos. I constantly learn something new. I just bought a used verus pro from my snapon dealer and was wondering if your digital book can be viewed on it? and also if it can be viewed on multiple devices ie; my cell phone, laptop, etc.I'm sure it can but just want to make sure. keep making awesome videos brother. God bless... ps when in doubt, FILM IT!!!
Thanks Joshua! Yes, the eBook can be viewed on your Verus!
any video dealing with electronic issues in a 90s American car is a case study in "Why did they hire this engineer?"
So a guy I worked with at Chevy dealer had a Corvette that had somehow learned a different resistance than it's Pill on the key due to some corrosion somewhere. They apparently had no way to find out what that value was and he was trying to find ways to bypass it. If he had hooked in a variable resistor into the circuit and turned it, assuming there is a PID for VATS to say YES this is the right resistance. Would that have worked to figure out what resistor was needed to bypass it?
i keep watching you i keep learning from you i wish i could download your book im from egypt
I couldn't offer a full refund on the eBook if it was a download my friend. Sorry.
at least i want you to know that i do fix all my friends and my neighbors cars when they breakdown for free and i keep telling them about you and we all thank you i dont have a master car to buy it on line unfortunately
ahmed
email me a paul@scannerdanner.com and we can figure something out for you to get the eBook
This easy fix addresses the problem with the resistance reading coming from the key cylinder or key pellet being wrong (broke wire, dirty pellet) but what if the problem is farther down the VATS line? I have a 2000 Chevy Lumina and the security light is constantly on but the car still starts. Don't know if you see this much but just putting a correct resistor in doesn't solve the issue of the security light staying on. I"m thinking maybe a failing theft deterrent module?
where did u get that tester kit from?....it's really cool.
Nice Paul thanks for share. =)
color bands can b downloaded on net. our u can Google it. I had to when I bypassed my mom's Buick century. Don't need keep with resistor chip no more. very helpful to download that chart
thanks Paul
if the signal wire is shorts to ground, the voltage will drop and the car may start...am i right ?
any video about immobilizer bypass mr paul plz
I don't have the key resistor but the one with the resistance in the ignition cylinder. Should I just place a 2k and do a relearn?
I have a 2000 Cadillac Deville with the Northstar security issue how do I fix or bypass it it doesn't have the pallet in the key
You cannot bypass those easily. You need to fix it. (new ignition tumbler/lock cylinder and or ignition switch is the most common cause)
it looks like a volume control of a radio, will it work if I used a transistor radio volume control as my potentiometer?
Paul i have been watching several of you videos and you appear to use the "Vantage" frequently. I have the opportunity to purchase one of them but I was curious if I should wait and hold out for a "Vantage Pro" to come along and this would give me a two channel scope. Or am I way off base with my thinking. I use a Maxsys for my main scanner.
Not at all!. Hold off for a Vantage Pro
Hey Paul, I've got an U1192 on a 1998 Chevy Silverado as far as I know it has no anti theft device on it. Any suggestions??? It's my pops truck and sometimes it's hard to start. I know what that one is, dirty mas sensor.
Hey SD. I love your vijayos and I'm at my wit's end watching this one. Can I PLEASE get an idea about my DW's 2006 Mazda MPV getting no spark. Thought it was pats but this van doesn't have it. Been renting cars for three months due to my layoff. I'm in the PGH area. My pride is hurt asking.
Bill. My classes start August 7th at Rosedale Tech. We will be in the classroom for the first 2 weeks , then we will be in the shop. I would be more than happy to help you troubleshoot your Mazda. I'm not promising you a fix but I will be able to tell you what's wrong. email me at paul@scannerdanner.com or hit me up on facebook okay?
Awesome Danner
Hi stumbled across your video great explaining, only I need help with a passkey 3 system on 03 suburban, did you by chance make one?
You need a module to bypass those as it is a timed signal with the ignition switch turn on
Brotha. If you can bypass a Cadillac. Then you can fix anything 😃😃😃. Great video
I hope you get to do something comparable for S10s, Blazers, etc.
That's a different system and cannot be bypassed with a simple resistor. They used a hall effect switch in the ignition lock cylinder that had a timing factor in relation to ignition positive feeds when you first turn the key on.
Easy way to solder a resistor is to cut the two wires to different lengths and solder the two ends so the resistor lies along the length of the wire then slip heat shrink over the top.
Ever heard about shrink tube? 😉
What equipment do you use to get picture in picture using a go pro and to get wave forms across the video and different effects you have used in other videos, if I may ask?
just multiple cameras a desktop feed and great editing software (Cyberlink PowerDirector 16)
Scanner Danner great video. I have a question for you and hopefully you can help me out. I bought a 93 fleetwood which someone already bypassed the VAT system. Suddenly one day the car wouldn't start. I continually kept charging the battery but every time I tried firing no it up nothing. So I called my friend in the valley and he told me it was the VAT system. So this morning I went underneath the dashboard and cut out the resisters they had soldered. When trying to measure the resisters from end to end I couldn't get NO reading. But when I measured them separately I got reading; 1.50, 1.50 and .022. And again when I measured them from end to end...no reading. The two wires under the dashboard are exactly what you said purple/white stripe and white/black stripe. Can this be my problem with me ignition? Thank you so much and keep up the great work. Going to subscribe right now. Your boy Eric from So.Cal.
I would think so my friend