C5 corvette vats bypass
Thread Starter
Intermediate
Joined: Mar 2011
Posts: 30
Likes: 0
C5 corvette vats bypass
Anyone know where I can get a VATS bypass for 2001 vette? I want to order one and have it shipped in Fedex - plug and play - I hope.
Adaptive performance is too slow. No response. No shipping date, etc. Ordered one on April 4, 2011.
Thanks to the forum and vette owners:
1. fixed turn signal problem - came on intermittingly - replaced hazard
switch
2. fixed check engine light problem - no check engine light - cigarette
fuse was not connected properly
3. changed oil sensor thanks to post 76 without removing manifold, etc.
4. changed spark plugs
5. replaced water pump.
6. replaced headlight gear passenger side.
7. replaced radiator - had a hairline crack on left side plastic piece at
top of radiator
8. thanks for product recommendations
Adaptive performance is too slow. No response. No shipping date, etc. Ordered one on April 4, 2011.
Thanks to the forum and vette owners:
1. fixed turn signal problem - came on intermittingly - replaced hazard
switch
2. fixed check engine light problem - no check engine light - cigarette
fuse was not connected properly
3. changed oil sensor thanks to post 76 without removing manifold, etc.
4. changed spark plugs
5. replaced water pump.
6. replaced headlight gear passenger side.
7. replaced radiator - had a hairline crack on left side plastic piece at
top of radiator
8. thanks for product recommendations
Racer
Joined: Jan 2011
Posts: 371
Likes: 1
From: Windsor Ontario
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
Since bypassing the VATS requires using a precision resistor that matches the ohm value of the pellet on the key (15 different values for the C5) I have never seen a "plug and play" solution.
Bypassing it is pretty straight forward. First step is to measure the resistance of the pellet in your key. It will be one of the values in the following table:
VATS #, Resistance in ohms
1 392
2 523
3 681
4 887
5 1.13k
6 1.47k
7 1.87k
8 2.37k
9 3.01k
10 3.74k
11 4.75k
12 6.04k
13 7.50k
14 9.53k
15 11.80k
Second step is to go to Radio Shack and purchase a precision resistor of the value of your key pellet. Some times you have to purchase multiple resistors and solder them in series to get the correct value.
Third step is to locate the 2 wire connector on the ignition switch that has only 2 white wires. Disconnect the connector and attach the resistor(s) you bought to the piece of the connector that goes up into the dash. (ie you do NOT attach then to the part that is on the ignition switch)
Bypass completed.
TO the poster that suggested a key with no resistor chip, that is a guaranteed way to keep the car from starting.......
Bypassing it is pretty straight forward. First step is to measure the resistance of the pellet in your key. It will be one of the values in the following table:
VATS #, Resistance in ohms
1 392
2 523
3 681
4 887
5 1.13k
6 1.47k
7 1.87k
8 2.37k
9 3.01k
10 3.74k
11 4.75k
12 6.04k
13 7.50k
14 9.53k
15 11.80k
Second step is to go to Radio Shack and purchase a precision resistor of the value of your key pellet. Some times you have to purchase multiple resistors and solder them in series to get the correct value.
Third step is to locate the 2 wire connector on the ignition switch that has only 2 white wires. Disconnect the connector and attach the resistor(s) you bought to the piece of the connector that goes up into the dash. (ie you do NOT attach then to the part that is on the ignition switch)
Bypass completed.
TO the poster that suggested a key with no resistor chip, that is a guaranteed way to keep the car from starting.......
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Drifting
Joined: Jul 2002
Posts: 1,329
Likes: 8
From: Corpus Christi Tx.
Bypass
Actually I did the bypass on my Vette 7 years ago using Radio Shack +/- 10 % resistors and have NEVER had a vats issue since ! see link here : http://www.c5help.com/bypass_vat.htm
Simple answer buy the Radio Shack Standard Resistors, solder together in series and jump the connection opposite the 2 white wires. Insert key and try to start car if it starts finish the job properly and put everything back together.
Simple answer buy the Radio Shack Standard Resistors, solder together in series and jump the connection opposite the 2 white wires. Insert key and try to start car if it starts finish the job properly and put everything back together.
Last edited by ICUALL; Apr 7, 2011 at 04:04 PM. Reason: added simple answer
Drifting
Joined: Jul 2002
Posts: 1,329
Likes: 8
From: Corpus Christi Tx.
Luck
Actually don't know about Luck, I have a good multimeter and tried several resistor combo's to get the exact value of the resistor pellet in the key. I did not accept in my case 1469 or 1471 as close enough.. 1470 on the nose ! Not (acceptable range 1411-1549)
Thread Starter
Intermediate
Joined: Mar 2011
Posts: 30
Likes: 0
Vats
Thanks everyone, after taken things apart, I found the problem. The car already had a bypass with a round circuit thing that held half a key with a chip in it. The half key was hanging out. I made sure the key was in tight. It started right up.
Drifting
Joined: Jul 2002
Posts: 1,329
Likes: 8
From: Corpus Christi Tx.
Race Director
Joined: Oct 2002
Posts: 10,864
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From: Southern CA
Racer
Joined: May 2008
Posts: 298
Likes: 8
From: Quad Cities Iowa
This is a good thread, but there weren't any photos. I took some when I installed my bypass.
two resistors in series to get close to 3.74k ohms
look for wire the screw driver is pointing to
same wire but with ignition cap removed
two white wires attach to white/purple wire with connector
resistors installed in connector to test
after resistors are isolated with electrical tape and wrapped to stablize
two resistors in series to get close to 3.74k ohms
look for wire the screw driver is pointing to
same wire but with ignition cap removed
two white wires attach to white/purple wire with connector
resistors installed in connector to test
after resistors are isolated with electrical tape and wrapped to stablize
Last edited by tb30570; Sep 16, 2014 at 08:51 PM.
Team Owner
Joined: Jul 2006
Posts: 22,139
Likes: 4,156
From: Kannapolis NC
