Security light
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 20
Likes: 0
From: Highlands Ranch CO
Security light
I have a security light on steady while driving but only occasionally about every other start cycle. I get a 2721 code only when the light comes on, the strangest thing that goes along with this is the car forgets the FOB about once a week and I have to reproram it. I used to have a start problem wth the pass code key but that has subsided when I found a connector bad on key harness? I have done everything on Bill's thread and more but still have electrical gremlin running around in car.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
You posted afew things there that could be unrelated problems
Focussing on the security light, you probably have a worn ignition barrel. Do you carry a lot of weight on your key ring? It may be causing the key to drop in the ignition and the VATS pellet may not be making a good contact. try your back up key and leave everything off the keyring to see if it improves.
Focussing on the security light, you probably have a worn ignition barrel. Do you carry a lot of weight on your key ring? It may be causing the key to drop in the ignition and the VATS pellet may not be making a good contact. try your back up key and leave everything off the keyring to see if it improves.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
You posted afew things there that could be unrelated problems
Focussing on the security light, you probably have a worn ignition barrel. Do you carry a lot of weight on your key ring? It may be causing the key to drop in the ignition and the VATS pellet may not be making a good contact. try your back up key and leave everything off the keyring to see if it improves.
Focussing on the security light, you probably have a worn ignition barrel. Do you carry a lot of weight on your key ring? It may be causing the key to drop in the ignition and the VATS pellet may not be making a good contact. try your back up key and leave everything off the keyring to see if it improves.
Seems that metal strip on the pellet on the spare key I never used even got some kind of coating on it from just sitting. I cleaned both key pellets with the pencil eraser and it cured the Security light from coming back on.
Last edited by ZeeOSix; Jul 13, 2011 at 04:38 PM.
Le Mans Master
Joined: Aug 2003
Posts: 5,471
Likes: 48
From: ================ From Toronto ================ 9/11/01 FDNY 343 R.I.P.
CI 6-7-8-9-10 Veteran
St. Jude Donor '08-'09-'10-'11-'13-'14
I recently had no start issues with the security light coming on and codes for the security system and "pull key wait 10 sec" messages .
I ended up replacing the ignition switch, after opening up the old one I now know why the car was giving all kinds of codes.
No issues since the swap.
Just a few burnt contacts on the old switch:
I ended up replacing the ignition switch, after opening up the old one I now know why the car was giving all kinds of codes.
No issues since the swap.
Just a few burnt contacts on the old switch:
Last edited by FFIN90; Jul 14, 2011 at 02:28 PM. Reason: added more pics
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
I recently had no start issues with the security light coming on and codes for the security system and "pull key wait 10 sec" messages .
I ended up replacing the ignition switch, after opening up the old one I now know why the car was giving all kinds of codes.
No issues since the swap.
Just a few burnt contacts on the old switch:
I ended up replacing the ignition switch, after opening up the old one I now know why the car was giving all kinds of codes.
No issues since the swap.
Just a few burnt contacts on the old switch:
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Tech Contributor
Joined: Jan 2007
Posts: 19,356
Likes: 1,127
From: Dyer, IN
A bad ignition switch will not precipitate a B2721......a bad(or flaky) lock cylinder will. Not saying you do not have two problems.......just being specific....
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 20
Likes: 0
From: Highlands Ranch CO
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 20
Likes: 0
From: Highlands Ranch CO
All,
I installed a different switch and barrel complete. Did have a few problems getting everything working again but so far so good. No codes or security light, also starts everytime. I will give it a week and reply again if fixed or not. I changed the Battery, starter, theft deterrent relay, cleaned all grounds, VOM'd all wires and it looks like it might have been the key cylinder the whole time. Car has 128,000 miles so beware the lock cylinders do wear out. I will let everyone know soon if this actually fixed the problem permanently. Thank you BC, Lucky and everyone else that helped with this.
I installed a different switch and barrel complete. Did have a few problems getting everything working again but so far so good. No codes or security light, also starts everytime. I will give it a week and reply again if fixed or not. I changed the Battery, starter, theft deterrent relay, cleaned all grounds, VOM'd all wires and it looks like it might have been the key cylinder the whole time. Car has 128,000 miles so beware the lock cylinders do wear out. I will let everyone know soon if this actually fixed the problem permanently. Thank you BC, Lucky and everyone else that helped with this.
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 20
Likes: 0
From: Highlands Ranch CO
Lucky, Curlee and others. I wanterd to update all of you that helped with the starting problems and secutity light after changing all the items which included;
Battery
Theft deterrant relay
starter
and repair of numerous connectors and wringing out all the wiring it eneded up being the tumbler and aftertI changed it I have not had a code or a start problem for 2 months. Thank you everyone for your input and help.
Don
Battery
Theft deterrant relay
starter
and repair of numerous connectors and wringing out all the wiring it eneded up being the tumbler and aftertI changed it I have not had a code or a start problem for 2 months. Thank you everyone for your input and help.
Don
Tech Contributor
Joined: Jan 2007
Posts: 19,356
Likes: 1,127
From: Dyer, IN
Lucky, Curlee and others. I wanterd to update all of you that helped with the starting problems and secutity light after changing all the items which included;
Battery
Theft deterrant relay
starter
and repair of numerous connectors and wringing out all the wiring it eneded up being the tumbler and aftertI changed it I have not had a code or a start problem for 2 months. Thank you everyone for your input and help.
Don
Battery
Theft deterrant relay
starter
and repair of numerous connectors and wringing out all the wiring it eneded up being the tumbler and aftertI changed it I have not had a code or a start problem for 2 months. Thank you everyone for your input and help.
Don
