VATS bypass question
Thread Starter
Intermediate
Joined: Jun 2025
Posts: 38
Likes: 31
VATS bypass question
I'm having an issue with the security light coming on whenever I hit a bump in the road. Most likely due to a loose fitting key causing the chip to loose contact in the ignition cylinder.
I've watched several videos and read online comments about the bypass and they mostly seem to remove the knee bolster and follow the wire from the ignition cylinder down to the connector and cut it there and solder in the proper resistor.
My question is, can I just cut that wire all the way up near the cylinder itself? My key bezel is missing and the wire is hanging right there, exposed. Seems like I should be able to cut it there rather than pulling the center console and knee bolster. And if I leave the wires there, tucked behind the bolster, I can always reconnect them if the bypass doesn't work for some reason.
Thanks for any assistance!!
I've watched several videos and read online comments about the bypass and they mostly seem to remove the knee bolster and follow the wire from the ignition cylinder down to the connector and cut it there and solder in the proper resistor.
My question is, can I just cut that wire all the way up near the cylinder itself? My key bezel is missing and the wire is hanging right there, exposed. Seems like I should be able to cut it there rather than pulling the center console and knee bolster. And if I leave the wires there, tucked behind the bolster, I can always reconnect them if the bypass doesn't work for some reason.
Thanks for any assistance!!
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Tech Contributor
Joined: Jan 2007
Posts: 19,465
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From: Dyer, IN
I'm having an issue with the security light coming on whenever I hit a bump in the road. Most likely due to a loose fitting key causing the chip to loose contact in the ignition cylinder.
I've watched several videos and read online comments about the bypass and they mostly seem to remove the knee bolster and follow the wire from the ignition cylinder down to the connector and cut it there and solder in the proper resistor.
My question is, can I just cut that wire all the way up near the cylinder itself? My key bezel is missing and the wire is hanging right there, exposed. Seems like I should be able to cut it there rather than pulling the center console and knee bolster. And if I leave the wires there, tucked behind the bolster, I can always reconnect them if the bypass doesn't work for some reason.
Thanks for any assistance!!
I've watched several videos and read online comments about the bypass and they mostly seem to remove the knee bolster and follow the wire from the ignition cylinder down to the connector and cut it there and solder in the proper resistor.
My question is, can I just cut that wire all the way up near the cylinder itself? My key bezel is missing and the wire is hanging right there, exposed. Seems like I should be able to cut it there rather than pulling the center console and knee bolster. And if I leave the wires there, tucked behind the bolster, I can always reconnect them if the bypass doesn't work for some reason.
Thanks for any assistance!!
Thread Starter
Intermediate
Joined: Jun 2025
Posts: 38
Likes: 31
Ok, Thank you for that info!!! I was just getting ready to pull the console out!!
So, if that contact or associated wiring were failing, that would cause the Security light to come on whenever I hit a decent bump?
So, if that contact or associated wiring were failing, that would cause the Security light to come on whenever I hit a decent bump?
Burning Brakes
Joined: Jul 2011
Posts: 996
Likes: 306
From: Southern Norway , Europe
Check for historic DTC codes .
You have probably poor connection at the ignition key resistor/sliprings .
As far as I know , if the BCM has with reading problems the keyresistor it will prevent the TDR relay to activate and will you have no start condition.
But while you driving with an armed UTD(universal Theft Deterent system) should not be dissarmed by a DTC like B2721/B2723(Pass key circiut problems)
You have probably poor connection at the ignition key resistor/sliprings .
As far as I know , if the BCM has with reading problems the keyresistor it will prevent the TDR relay to activate and will you have no start condition.
But while you driving with an armed UTD(universal Theft Deterent system) should not be dissarmed by a DTC like B2721/B2723(Pass key circiut problems)
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
Check for historic DTC codes .
You have probably poor connection at the ignition key resistor/sliprings .
As far as I know , if the BCM has with reading problems the keyresistor it will prevent the TDR relay to activate and will you have no start condition.
But while you driving with an armed UTD(universal Theft Deterent system) should not be dissarmed by a DTC like B2721/B2723(Pass key circiut problems)
You have probably poor connection at the ignition key resistor/sliprings .
As far as I know , if the BCM has with reading problems the keyresistor it will prevent the TDR relay to activate and will you have no start condition.
But while you driving with an armed UTD(universal Theft Deterent system) should not be dissarmed by a DTC like B2721/B2723(Pass key circiut problems)
Thread Starter
Intermediate
Joined: Jun 2025
Posts: 38
Likes: 31
Yeah, I've never had a "no crank" issue.
Just the security light when I hit a bump.
I just thought it was due to the key being very loose in the ignition. I mistakenly thought it was reading the keychip all the time.
Thanks for the info guys!!!
Just the security light when I hit a bump.
I just thought it was due to the key being very loose in the ignition. I mistakenly thought it was reading the keychip all the time.
Thanks for the info guys!!!
Burning Brakes
Joined: Jul 2011
Posts: 996
Likes: 306
From: Southern Norway , Europe
I noticed you had no starting issues .
My statement is your corrrect , the BCM monitor the passkey voltage all the time as you as thought .
I made this test on my car today and made this video proving this fact.
I started may car with no codes and it was idling all the time during the 3-4 min test, disconnected the passkey resistor , got the B2723 due to passkey voltage jumped from 1.56 volt to 4.97volt and
back to 1.56v when I reconnected the resistor . Cleared the code but the Securitylight did not went out before I shutdown and started the car again
My statement is your corrrect , the BCM monitor the passkey voltage all the time as you as thought .
I made this test on my car today and made this video proving this fact.
I started may car with no codes and it was idling all the time during the 3-4 min test, disconnected the passkey resistor , got the B2723 due to passkey voltage jumped from 1.56 volt to 4.97volt and
back to 1.56v when I reconnected the resistor . Cleared the code but the Securitylight did not went out before I shutdown and started the car again
Last edited by oelarse; Sep 16, 2025 at 07:05 AM.
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Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
I noticed you had no starting issues .
My statement is your corrrect , the BCM monitor the passkey voltage all the time as you as you thought .
I made this test on my car today and made this video proving this fact.
I started may car with no codes and it was idling all the time during the 3-4 min test, disconnected the passkey resistor , got the B2723 due to passkey voltage jumped from 1.56 volt to 4.97volt and
back to 1.56v when I reconnected the resistor . Cleared the code but the Securitylight did not went out before I shutdown and started the car again
This video show these it
My statement is your corrrect , the BCM monitor the passkey voltage all the time as you as you thought .
I made this test on my car today and made this video proving this fact.
I started may car with no codes and it was idling all the time during the 3-4 min test, disconnected the passkey resistor , got the B2723 due to passkey voltage jumped from 1.56 volt to 4.97volt and
back to 1.56v when I reconnected the resistor . Cleared the code but the Securitylight did not went out before I shutdown and started the car again
This video show these it
@rnoggle are you certain you have no codes?
Last edited by lucky131969; Sep 16, 2025 at 07:01 AM.
Thread Starter
Intermediate
Joined: Jun 2025
Posts: 38
Likes: 31
I noticed you had no starting issues .
My statement is your corrrect , the BCM monitor the passkey voltage all the time as you as thought .
I made this test on my car today and made this video proving this fact.
I started may car with no codes and it was idling all the time during the 3-4 min test, disconnected the passkey resistor , got the B2723 due to passkey voltage jumped from 1.56 volt to 4.97volt and
back to 1.56v when I reconnected the resistor . Cleared the code but the Securitylight did not went out before I shutdown and started the car again
\
My statement is your corrrect , the BCM monitor the passkey voltage all the time as you as thought .
I made this test on my car today and made this video proving this fact.
I started may car with no codes and it was idling all the time during the 3-4 min test, disconnected the passkey resistor , got the B2723 due to passkey voltage jumped from 1.56 volt to 4.97volt and
back to 1.56v when I reconnected the resistor . Cleared the code but the Securitylight did not went out before I shutdown and started the car again
\
I haven't checked to see if there is a code. Guess I should do that next.
Thread Starter
Intermediate
Joined: Jun 2025
Posts: 38
Likes: 31
I finally got around to doing the bypass this week.
I have to cross a really rough RR crossing going to work and the security light would come on every tiime.
Since I did the bypass, I haven't had the light come on at all.
I have to cross a really rough RR crossing going to work and the security light would come on every tiime.
Since I did the bypass, I haven't had the light come on at all.