1990 vats question
Thread Starter
Racer
Joined: Nov 2012
Posts: 375
Likes: 0
1990 vats question
Okay does the ccm need the vats code and then it interprets and sends signal to ecm or does the ecm only see the signal?
I have seen vats decoder boxes in earlier gm cars but no mention of it in 90 manuals.
Don't have problems just selling ecm and ccm so need to know who needs the vats code
Thanks
I have seen vats decoder boxes in earlier gm cars but no mention of it in 90 manuals.
Don't have problems just selling ecm and ccm so need to know who needs the vats code
Thanks
Team Owner
Joined: Sep 2003
Posts: 25,366
Likes: 2,732
Okay does the ccm need the vats code and then it interprets and sends signal to ecm or does the ecm only see the signal?
I have seen vats decoder boxes in earlier gm cars but no mention of it in 90 manuals.
Don't have problems just selling ecm and ccm so need to know who needs the vats code
Thanks
I have seen vats decoder boxes in earlier gm cars but no mention of it in 90 manuals.
Don't have problems just selling ecm and ccm so need to know who needs the vats code
Thanks
Last edited by WVZR-1; May 5, 2014 at 04:02 PM.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Or it can be bypassed by the use of a resistor to give the correct read at the key switch, or program it out of the ECM's memcal, and bypass starter relay.
www.vatssucks.com
www.vatssucks.com
Team Owner
Joined: Sep 2003
Posts: 25,366
Likes: 2,732
Or it can be bypassed by the use of a resistor to give the correct read at the key switch, or program it out of the ECM's memcal, and bypass starter relay.
www.vatssucks.com
www.vatssucks.com
BTW - there's many that don't feel that VATS Sucks but you're certainly the first to mention.
Last edited by WVZR-1; May 5, 2014 at 04:15 PM.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Regardless the VATS resistance needs decoded - now if there's a "super secret" solution to determine that then I'd be interested in being made aware of that. If the resistance is "unknown" I believe it would certainly be a more difficult sell.
BTW - there's many that don't feel that VATS Sucks but you're certainly the first to mention.
BTW - there's many that don't feel that VATS Sucks but you're certainly the first to mention.
You know as well as I do that a simple resistance module purchased from flea bay, or wherever is capable of bypassing the key switch at the steering column. If the memcal is reprogrammed, and the starter enable relay grounded, and or bypassed then there's nothing for the CCM to interfere with.
Honestly, do you really think this is the first time this issue has come across this board? Maybe since yesterday. Whether for or against I was simply pointing out more options that you left out.
Have a wonderful day sir!
Team Owner
Joined: Sep 2003
Posts: 25,366
Likes: 2,732
Don't know that it's important in your sale or not but the mileage and the VIN are locked in the CCM also.
Last edited by WVZR-1; May 5, 2014 at 07:20 PM.
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Thread Starter
Racer
Joined: Nov 2012
Posts: 375
Likes: 0
I believe I understood the post. Is a CCM with the key or known resistance worth more than just a CCM or is it of no consequence. If you were parting a car the key might be of significant value for the sale of a column. If you've 2 keys - one for each OR the resistance value is the only requirement for the CCM. The actual key isn't but in the past I've just taped a Known key to the CCM to keep track of and send with - as you've mentioned doing. I think you did the buyer well!
Don't know that it's important in your sale or not but the mileage and the VIN are locked in the CCM also.
Don't know that it's important in your sale or not but the mileage and the VIN are locked in the CCM also.
Buyer said he would have key read and text me back the code. I just wasn't sure if the value of key would help him since some cars have a decoder box alone for vats. I figured since I didn't see a decoder box figured the key would save him on nightmares.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The function of the VATS module was moved into the CCM in 1990.
I have heard that there is a method to get the CCM to "learn" the key resistance. It uses a different system (ADC converter) than the older VATS module (voltage comparator), so I believe that this is possible. Found it! Here ya go:
http://my.cardone.com/techdocs/pt%2077-0011.pdf
I have heard that there is a method to get the CCM to "learn" the key resistance. It uses a different system (ADC converter) than the older VATS module (voltage comparator), so I believe that this is possible. Found it! Here ya go:
http://my.cardone.com/techdocs/pt%2077-0011.pdf
Team Owner
Joined: Sep 2003
Posts: 25,366
Likes: 2,732
The function of the VATS module was moved into the CCM in 1990.
I have heard that there is a method to get the CCM to "learn" the key resistance. It uses a different system (ADC converter) than the older VATS module (voltage comparator), so I believe that this is possible. Found it! Here ya go:
http://my.cardone.com/techdocs/pt%2077-0011.pdf
I have heard that there is a method to get the CCM to "learn" the key resistance. It uses a different system (ADC converter) than the older VATS module (voltage comparator), so I believe that this is possible. Found it! Here ya go:
http://my.cardone.com/techdocs/pt%2077-0011.pdf
An "out of the box" CCM, reconditioned (properly) or new can learn an existing set of keys and it's suggested to use 2 keys for the learn. Using a single key "twice" does NOT assure that another second key or a service key will work. This procedure is for CCM vehicles
The VATS, VIN and mileage can't be "overwritten" but only written to after being properly erased.
The OP did his buyer well
Last edited by WVZR-1; May 6, 2014 at 04:59 AM.