Tire Pressure Question
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Have you driven the car to "wake up" the sensors?? Also I'm assuming you put the wheels back in their original positions .... that wouldn't account for the lack of readings ... but if you swapped, say, the Left and Right fronts you will need to reprogram the sensors.
Thread Starter
Instructor
Joined: Jun 2006
Posts: 241
Likes: 0
From: Gambrills Maryland
I drove the car about 35 miles since. I was worried about the tire location, but I have 18 fronts and 19 rears with directional tires so that would take care of the location problem.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Are you getting any messages or DTC codes?
Maybe trying to reprogram them will do it ... but with the car parked, engine off ... theoreticallly you could remove the wheels .... take them 100 miles from the car, and when you re-install them and drive the car the sensors should work again.
The sensors are transmitters, they do not receive radio data, so they have no way of knowing whether the car is near or far when they are "ON" and transmitting. The car only looks for the sensors when it is on, and gives them a short while to wake up once the car starts moving. The receiver in the car is the RFA (Remote Function Actuater) which also receives your key fob signals to lock/unlock the car.
If your key fob is still working ... then it almost has to be in the sensors ... though why all 4 would experience the same "failure" at the same time is WEIRD.
Only other possibility is that the sensors are "confused" by the motion of the wheels being removed/installed on the car. Maybe let the car sit for a couple of hours to be sure the sensors have gone to "sleep", then take it out for another drive and see if they wake up OK then.
Good luck,
Maybe trying to reprogram them will do it ... but with the car parked, engine off ... theoreticallly you could remove the wheels .... take them 100 miles from the car, and when you re-install them and drive the car the sensors should work again.
The sensors are transmitters, they do not receive radio data, so they have no way of knowing whether the car is near or far when they are "ON" and transmitting. The car only looks for the sensors when it is on, and gives them a short while to wake up once the car starts moving. The receiver in the car is the RFA (Remote Function Actuater) which also receives your key fob signals to lock/unlock the car.
If your key fob is still working ... then it almost has to be in the sensors ... though why all 4 would experience the same "failure" at the same time is WEIRD.
Only other possibility is that the sensors are "confused" by the motion of the wheels being removed/installed on the car. Maybe let the car sit for a couple of hours to be sure the sensors have gone to "sleep", then take it out for another drive and see if they wake up OK then.
Good luck,
Race Director
Joined: Jan 2007
Posts: 16,513
Likes: 4
From: Official Dirty Dozen Member
the sensors would still work, but be in the wrong positions
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
Now, you got me curious...
...OK, you didn't remove the TPMs when you replaced the Rotors, did you?...so, they should still be in their same position in all wheels..all you did was remove all 4 wheels, replace Rotors...right?
....that being the case, it would be worth knowing if the Rotors you installed have had some effect on the signal transfer from the Tire Pressure Monitors to the reader in the computer? Make sense? I have no experience in changing out rotors, but something (new Rotors?) has caused the sensors to stop transmitting. I would try relearning the TPMs & see if this works:
Resetting Tire Pressure Monitors
1) Turn ignition on 2) Press "Reset" button in order to clear any IPC display warning messages 3) Press and release the "Options" button on the DIC to scroll through the display options until the IPC display is blank 4) Press and hold the DIC "Reset" button for 3 seconds 5) Press the "Options" button again until TIRE TRAINING message appears 6) Press "Reset" button until the IPC "Learn L Front Tire" message appears in order to begin the programming 7) Install the J41760 Tire Pressure Monitor (TPM) System Programming Tool (large magnet will do) over the left front valve stem 8) The horn will sound, indicating the left front TPM sensor is programmed (if this takes more than 15 seconds, pull magnet back and try again, it will give you three tries. Then you must start over) 9) When the horn sounds, proceed to program the next TPM sensor in the following order as directed by the IPC messages: -Learn R Front Tire -Learn R Rear Tire -Learn L Rear Tire Programming can be canceled by turning ignition off, waiting 2 minutes with no sensors being learned, finishing all 4 wheels or through the DIC. If the programming is canceled with less than 4 sensors learned, it will only accept the codes programmed up to that point.
....that being the case, it would be worth knowing if the Rotors you installed have had some effect on the signal transfer from the Tire Pressure Monitors to the reader in the computer? Make sense? I have no experience in changing out rotors, but something (new Rotors?) has caused the sensors to stop transmitting. I would try relearning the TPMs & see if this works:
Resetting Tire Pressure Monitors
1) Turn ignition on 2) Press "Reset" button in order to clear any IPC display warning messages 3) Press and release the "Options" button on the DIC to scroll through the display options until the IPC display is blank 4) Press and hold the DIC "Reset" button for 3 seconds 5) Press the "Options" button again until TIRE TRAINING message appears 6) Press "Reset" button until the IPC "Learn L Front Tire" message appears in order to begin the programming 7) Install the J41760 Tire Pressure Monitor (TPM) System Programming Tool (large magnet will do) over the left front valve stem 8) The horn will sound, indicating the left front TPM sensor is programmed (if this takes more than 15 seconds, pull magnet back and try again, it will give you three tries. Then you must start over) 9) When the horn sounds, proceed to program the next TPM sensor in the following order as directed by the IPC messages: -Learn R Front Tire -Learn R Rear Tire -Learn L Rear Tire Programming can be canceled by turning ignition off, waiting 2 minutes with no sensors being learned, finishing all 4 wheels or through the DIC. If the programming is canceled with less than 4 sensors learned, it will only accept the codes programmed up to that point.
Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
I have a crazy theory. You can magnetize metal by rubbing it in one direction. Machining metal sometimes magnetizes it. Maybe your new rotors are slightly magnetic and reset your TPS's (I told you this was a crazy theory).
Try relearning them. You could also use a paperclip to see if rotors are magnetic.
With a 99 C5, you are getting close to the end of life on Series 1 sensors, but all 4 going at once AND when you do this is highly unlikely.
Try relearning them. You could also use a paperclip to see if rotors are magnetic.
With a 99 C5, you are getting close to the end of life on Series 1 sensors, but all 4 going at once AND when you do this is highly unlikely.
Last edited by Oldvetter; Jul 2, 2007 at 08:11 AM.
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Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
I had one that was not responding on my 98 after a tire change, for many miles, until I ran over some railroad tracks, then it came alive. I thought maybe the motion sensor got "stuck". But for all 4 not to respond and after just taking wheels off, this is strange.
Let us know if this happens again.
Let us know if this happens again.
