TPMS mystery
Thread Starter
Instructor
Joined: Nov 2003
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From: Aldie VA
TPMS mystery
I know that there is a lot of discussion on the forum about the vagaries of our TPMS systems and I have scoured the threads and responses published by others, but I have a problem that I can't quite understand.
I bought my CCWs in 2008 with new sensors installed.
About three weeks ago upon turning the car off, I got the "service tire monitoring system" and all four wheels went to XXX for the pressure. I tried multiple iterations of the relearn procedure, but to no avail.
I then detached the battery for an hour, hooked it back up and that cleared the codes, but my pressure readings are now all blanks. And the relearn procedure still doesn't work, although I've driven the car around trying to "wake up" the sensors.
My FOBs work perfectly, so I presume the receiver is OK. Does anyone know if it's possible for the receiver to work properly for the FOB function but be kaput for the TPMS function?
I bought my CCWs in 2008 with new sensors installed.
About three weeks ago upon turning the car off, I got the "service tire monitoring system" and all four wheels went to XXX for the pressure. I tried multiple iterations of the relearn procedure, but to no avail.
I then detached the battery for an hour, hooked it back up and that cleared the codes, but my pressure readings are now all blanks. And the relearn procedure still doesn't work, although I've driven the car around trying to "wake up" the sensors.
My FOBs work perfectly, so I presume the receiver is OK. Does anyone know if it's possible for the receiver to work properly for the FOB function but be kaput for the TPMS function?
Tech Contributor
Joined: Dec 2003
Posts: 19,384
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From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Thats a strange one. If the fobs work the RFA should be good.
XXX normally means a bad battery at the TPS but I've never heard all 4 fail simultaneously.
Is it going through the relearn properly? Do you get a honk at each wheel and it moves on to the next wheel? If so does the pressure just go blank?
Any codes?
XXX normally means a bad battery at the TPS but I've never heard all 4 fail simultaneously.
Is it going through the relearn properly? Do you get a honk at each wheel and it moves on to the next wheel? If so does the pressure just go blank?
Any codes?
Thread Starter
Instructor
Joined: Nov 2003
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From: Aldie VA
DeeGee
No, none of them gives me a honk. I even tried four others sitting in the driver's seat and they won't go either.
The only current codes I got after the initial incident were for the four sensors. Now they are history codes since I disconnected and reconnected the battery.
I've done it successfully in the past, so this has me stumped.
No, none of them gives me a honk. I even tried four others sitting in the driver's seat and they won't go either.
The only current codes I got after the initial incident were for the four sensors. Now they are history codes since I disconnected and reconnected the battery.
I've done it successfully in the past, so this has me stumped.
Le Mans Master
Joined: Dec 2004
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From: Myrtle Beach SC
St. Jude Donor '05-'06
Thats a strange one. If the fobs work the RFA should be good.
XXX normally means a bad battery at the TPS but I've never heard all 4 fail simultaneously.
Is it going through the relearn properly? Do you get a honk at each wheel and it moves on to the next wheel? If so does the pressure just go blank?
Any codes?
XXX normally means a bad battery at the TPS but I've never heard all 4 fail simultaneously.
Is it going through the relearn properly? Do you get a honk at each wheel and it moves on to the next wheel? If so does the pressure just go blank?
Any codes?
You need a STRONG magnet. At this point blank means they are not learned. It takes 15-30sec or so with the magnet on the stem to get the horn to beep LF-RF-RR-LR . Learning will time out if the magnet does not turn it on. Try again if it does till you get a horn beep.Driving around will do nothing. They have to be taught 1 at a time.Not sure why they went to XXX though that is strange.
Thread Starter
Instructor
Joined: Nov 2003
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From: Aldie VA
Redeasysport,
Yes, I did try a very strong magnet that I use for my fish tank, but that didn't work either.
I have always used a largish pickup tool magnet that has always worked. I was even considering one of those ATEQ devices.
Thanks.
Yes, I did try a very strong magnet that I use for my fish tank, but that didn't work either.
I have always used a largish pickup tool magnet that has always worked. I was even considering one of those ATEQ devices.
Thanks.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
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From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
You just need to find a really big magnet. I used a speaker magnet the first time I reprogramed the TPS. This time it didn't work and I had to buy a HUGE magnet. The one that worked is so big it clamped to the rotors before it gave the "honk"
Thread Starter
Instructor
Joined: Nov 2003
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From: Aldie VA
Wow, that's what I'll have to try next. As I stated, I've always been able to do it with one of those stronger pickup magnet. I guess as they age, they are harder to activate.
Thanks very much!
Thanks very much!
