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Tool Talk Discussion Forum

Topic: Chevy Passkey II anti-theft system *%$#*
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s.crum

10-05-2012 18:10:19
67.142.181.21



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Any advice of these useless systems? I just had to have favorite daughter's 97' Chevy Lumina hauled home from college. The starter/ignition system is dead. If I jump the starter the car will crank and start then quit. The "SECURITY" light in the dash is flashing with the key in the run position. The guy that hauled the car said to hook up a battery charger to it and leave the key in the "RUN" position for 30 minutes then turn the key off then try to restart it. I've tried this with both ignition keys but it still doesn't crank or start. I also cleaned the keys and sprayed the switch with contact cleaner. I have not yet disconnected the battery to see if completely powering down would help. Any advice? thanks

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Inno

10-07-2012 06:40:45
65.95.123.154



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
That may be.........but I'd rather stick to my 5% when I'm doing them and make sure I don't cause any problems. :)

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Hobo,NC

10-06-2012 17:01:58
71.30.77.164



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Re: Chevy Passkey II anti-theft system *%$#* in reply to NCWayne, 10-05-2012 18:10:19  
Quoting Removed, click Modern View to see

Its 10% :wink:

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carogator

10-06-2012 16:22:18
205.188.116.142



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
s.crum, just talked with a repairman that has a lot of experience with similar problems. He suggests that you disconnect the battery for 30 minutes. Then turn the key to the on position only
for 15 seconds, turn it off, back on for 15 seconds, turn it off, then try to start the engine. If it does not reset , go through this procedure one more time. If it isn"t fixed, then you may have a bad key or computer. This would be a proper fix rather than bypassing. Hope this helps.

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s.crum

10-06-2012 16:30:59
67.142.181.26



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Re: Chevy Passkey II anti-theft system *%$#* in reply to carogator, 10-06-2012 16:22:18  
Thanks for the reply. The reader in the lock cylinder was apparently the problem. I installed the resistor to "cheat" the computer into thinking everything is ok. Realistically replacing the cylinder and wiring is the correct repair, but considering this is a 16 year old rust bucket with 200+ thousand miles on the clock, nobody in their right mind would want to steal it even if I held the door open for them.

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carogator

10-06-2012 16:56:57
205.188.116.142



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-06-2012 16:30:59  
Kind of like mine, I couldn't pay anyone to take it.

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Inno

10-06-2012 15:40:46
65.95.123.154



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Re: WE ARE GOOD !!! in reply to s.crum, 10-05-2012 18:10:19  
That's great! And probably the last time you'll have to worry about that going wrong.

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s.crum

10-06-2012 16:01:43
67.142.181.26



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Re: WE ARE GOOD !!! in reply to Inno, 10-06-2012 15:40:46  
Well maybe not yet! Favorite son is driving a 2000 Lumina. I read his key and it has the same ohm value as this one. If he breaks his system, I have 4 more resistors (pack of 5 for a buck) and the knowledge for a quick repair! YAY

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s.crum

10-06-2012 09:05:44
67.142.181.26



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WE ARE GOOD !!! in reply to s.crum, 10-05-2012 18:10:19  
The Rumina is up and running! I found the 2 white wires coming out of the column inside the lower kick panel. I pulled the connector apart and on the computer side I plugged a 5.6K resistor into it and it started right up. Thank you everyone for your usual great advice! Favorite daughter probably won't be thrilled because she'll have to give my Silverado back! But Que sera sera! (read tough s*&t kid) lol

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Inno

10-06-2012 06:44:36
65.95.123.154



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
I should also note that this will only work if the fault is between the ignition switch and the VATS module. Beyond that, if the VATS module is gone it won't send the correct signal to the vehicles computer and it still won't work even with the correct resistor value.

I have seen this happen and helped a friend troubleshoot a Buick which was around the same age as your Lumina. He ended up going to the junk yard and finding another VATS module. It is the VATS module that dictates what resistor value it needs to see so if you end up having to go that route you will need to know the resistor value from the car the module came from.

Hopefully it won't come to that.

There is ALSO a circuit that can be built or bought to bypass the whole VATS system all together, it simply sends a signal to the vehicle computer at all times, no resistors needed!

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Inno

10-06-2012 06:34:20
65.95.123.154



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Re: Chevy Passkey II anti-theft system *%$#* in reply to George Marsh, 10-05-2012 18:10:19  
Quoting Removed, click Modern View to see

I think it goes from 2 white wires to a plug where it becomes a yellow and a black............or it could be one or the other.

Best bet is to take the cover off like you planned and make sure it's the right one.

I install remote car starters and have to bypass these security systems to make the cars start without keys in them so I've done a few.

Now if there is a pellet on the key (and I'm pretty sure there is), you actually have the VATS key system, the first one put out by GM. Passkey II is a little different but I believe the VATS key system is the simplest to bypass.

Here is a list of all the different resistor values they used. Measure the value of the resistor pellet on your keys and find the value closest and try to match it within 5% of the orig. value or it may not work.

392 Ohms

525 Ohms

680 Ohms

890 Ohms

1.13 K Ohms 1.47 K Ohms

1.80 K Ohms

2.37 K Ohms

3.00 K Ohms

3.74 K Ohms 4.75 K Ohms

6.00 K Ohms

7.50 K Ohms

9.53 K Ohms

11.8 K Ohms

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wisbaker

10-06-2012 04:27:36
207.118.177.28



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
Just wait until you have to deal with PATS keys or the new keyless keys from Mopar. But hey the insurance company and rental car companies are happy because auto theft is down. Preventative cost for each theft is probably around $20,000 an incident but heck the cost is passed to us, they're not paying Obama would be proud

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Cliff(VA)

10-08-2012 07:04:53
70.89.233.37



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Re: Chevy Passkey II anti-theft system *%$#* in reply to wisbaker, 10-06-2012 04:27:36  
I just bought a '03 Dodge Caravan. It has the new Mopar key system. It takes 2 keys to program a new one. So I bought new keys blanks off of ebay, paid the local hardware man to cut them, and then programmed them all to work. I think my cost including cutting was 8 dollars a key vs. Lowes "clone" key at $75.

I HIGHLY recommend that you put away TWO working keys in case you lose one of your origials. At the vary least you need to have 3 keys on different rings.

Saves lots of trouble if you loose one.

Cliff(VA)

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Gambles

10-05-2012 21:18:40
24.246.215.127



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
My daughter had a '97 Monte Carlo that had that same system. I bought some replacement keys off of ebay and had the local hardware store cut them. The intake gaskets had to be replaced and I fixed them, but when the head gaskets went, I called the scrap man. It was a happy day in my life.

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s.crum

10-05-2012 21:37:15
67.142.181.21



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Re: Chevy Passkey II anti-theft system *%$#* in reply to Gambles, 10-05-2012 21:18:40  
I really can't complain about this car or Favorite son's 2000 Lumina both of them cost me less than a grand each, and they are both well past the 200,000 mile mark. Bondo and brake lines have been the biggest thing (aside from 1 $500 fuel pump). Both are dented and scratched but dependable most of the time. If one gets wrecked, well there is some metal there.

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s.crum

10-05-2012 20:19:57
67.142.181.21



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
Hey guys! I found some real good info (just Google it dummy) for bypassing the reader in the ignition switch. It's just like several said to do it and was very detailed on reading the resistance value of the key pellet and making a resistor pack to match it. Now if I don't do something stupid and detonate the airbags, I should have favorite daughter up and running by lunchtime tomorrow and get my truck back.
THANKS!!!

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wvajim

10-05-2012 21:31:24
173.80.241.17



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 20:19:57  
I can"t find the link to the ebay auction, but there is a guy who sells a kit with the resisters that are just the ones that are needed for what you are referring to. I did it with a bunch of resisters from radio shack on a camaro. I am sure the website you are looking at will tell you its yellow wires (don"t take my word for it, been a while) but I just read the resistance on the key, made up a link of them and soldered them to the wires under the dash, fixed.

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s.crum

10-05-2012 21:45:41
67.142.181.21



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Re: Chevy Passkey II anti-theft system *%$#* in reply to wvajim, 10-05-2012 21:31:24  
One site says a yellow and a black wire and another site says 2 whites bundled in an orange cover and don't touch the yellow wires (airbags). I have to take the clamshell cover off the column to get to the wires, so I'll follow them back to the key cylinder to be sure I cut into the correct one's.
Thanks!

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Tom in TN

10-05-2012 20:13:08
166.248.81.184



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
SCrum,

I don't nothin' about no fancy key system on new cars, but I once had a 1968 Ford. The ignition switch went bad and I didn't have enough money to buy a new one.

I scrounged around and found a single pole, double throw toggle switch and a momentary push-button switch. I wired the toggle switch so one pole was the "ignition" and the other pole was the "accessory" position. Then I wired the momentary switch to operate the starter solenoid. I ran it like that for a bunch of years and finally sold the car to a junk man. He didn't care.

Tom in TN

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s.crum

10-05-2012 20:49:06
67.142.181.21



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Re: Chevy Passkey II anti-theft system *%$#* in reply to Tom in TN, 10-05-2012 20:13:08  
I miss those days! had a 53' Chevy truck on the farm I rigged up the same way. Pretty tough to do on these newer computer controlled hacks though. I was trying hard today to find a way to "hot wire" this to avoid having to have it hauled home. Thank God for AAA!

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1970-1655

10-05-2012 19:05:32
184.9.225.211



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
We had a 2004 Impala that did that. Dealer replaced ignition switch module. $875 to fix it. Another year later and it did it again. Same fix. Third time it failed, they said it would also need one of the computers replaced. This would be another $1,200 on top of the $875 part. I fixed it myself. I traded cars and let the dealer pay for the repair.

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Drew

10-05-2012 18:39:56
72.161.211.99



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
My dad had to haul my brother"s 96 Bonneville home from college a few years ago because of the same problem. He fixed it just as barnE describes and it worked great. I guess the ONE upside of us living in a university city is he wasn"t far from home when it died.

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gregger

10-05-2012 18:23:47
74.206.61.188



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
my 2000 chevy trk the radio quit working had a guy put a used 1 in it and he had to call someone for a code # , he put the # in the radio i forget what thingie he pushed on the radio and put 4 digdit # in -- he did right the number on the radio if i ever need it -- gregger

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barnE

10-05-2012 18:18:19
67.172.83.183



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Re: Chevy Passkey II anti-theft system *%$#* in reply to s.crum, 10-05-2012 18:10:19  
One I fixed. Had to open lower dash and find 2 wires going to key resistor reader. Cut and install 1/2 watt carbor resistor close as possible to right value. Solder connections and tape and insulate well. Value can be found on internet or read directly off key if GOOD. Use most accurate meter you can find. Your kid will swear you are genius. Another possibility is chip fell off of key. Try another key. Dave

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Ken Macfarlane

10-05-2012 18:28:57
184.151.114.177



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Re: Chevy Passkey II anti-theft system *%$#* in reply to barnE, 10-05-2012 18:18:19  
Its been years but I vaguely recall soldering a resistor into a friends 96 sunfire because of the same problem. I don't think it was a fancy chip key, just a resistance so you couldn't just jam a screwdriver in and start it.

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