: Resetting the TPS's



Fasciaguy
12-13-10, 09:41 PM
I read in the tips that the tire pressure sensors could be reset by turning the key to the on position hitting the lock unlock on your fob until the horn honks and then putting air in or letting it out of each tire in a particular order.

Has anyone got this to work? I tried as my TPS dont match the screen on my dash. So the front RH is actually the LH rear etc...I flipped the lock and unlock probably 20 times and no horn so thats as far as I got.
The tire shop that mounted and balanced the wheels were unable to get it set up with their hand held electronic connector either.

RippyPartsDept
12-13-10, 10:05 PM
http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/91769-reprogramming-tpms.html#post991571

ctsv154
12-13-10, 10:21 PM
You don't need any magnets. Just turn the key to on/run but don't start the car. Then on the key fob, hold lock and unlock at the same time until the horn honks. When it does, start at the left front and work your way around. You can either put air in or let it out, doesn't matter.

Twitch
12-14-10, 10:20 AM
Make sure the screen on the dash shows the tire pressures. This got me once.

ROG
12-14-10, 02:52 PM
PM sent.

repenttokyo
12-14-10, 03:03 PM
just did mine 5 mins ago!

Fasciaguy
12-14-10, 03:13 PM
So if I do get the horn to honk by pressing the lock and unlock at the same time will the horn honk after each wheel is set as described in the above link? I assume it will also honk twice on the last wheel to let me know its the last tire set?

AAIIIC
12-14-10, 03:49 PM
Isn't that what the procedure in the FAQ says?

liqidvenom
12-14-10, 11:40 PM
for some odd reason my new tps sensors are not going past the first wheel... i will have to give it a shot again some time soon.

RippyPartsDept
12-15-10, 12:05 AM
there's different 'tricks' i've seen people do to get the tpms to 'program' (stronger magnets etc)

we used to hold our special programming tool up to the top of the valve stem, but sometimes that didn't seem to work

someone gave us a tip to try pointing it through the sidewall of the tire and that seems to work the best

the sensor is really not very close to the tip of the valve stem, but only a little bit through the sidewall of the tire and the rim edge so give that a try if you haven't

.... that is if you're using the magnet technique

D3l7a3ch0
12-15-10, 01:01 AM
I had to let 6-8 psi out of each tire to get a horn confirmation. it also seemed to honk only after I stopped releasing air. and yes two honks after the last tire.

Aurora40
12-15-10, 07:08 PM
I had to let 6-8 psi out of each tire to get a horn confirmation. it also seemed to honk only after I stopped releasing air. and yes two honks after the last tire.

That was the case for me too. I had to let an awful lot of air out, and sometimes it seemed to honk only after I stopped, so maybe that was why it took so much air.

Twitch
12-16-10, 08:29 AM
You don't have to keep letting out air till it honks. If they are working properly, I let air out for 2-3 seconds and move on to the next tire. Then it honks, and I let air out the next.

Tony

AAIIIC
12-16-10, 03:14 PM
Yup, I'm with Tony. I let out 2-3# of air (so just a couple/few seconds), stop, wait for the honk, move on.

JFensty
12-16-10, 04:54 PM
I can start to program the TPMS sensors, get the honk, let air out of driver frt, honk, then pass frt, honk, then pass. rear, honk. Driver rear no honk. When I get back into the car its the driver front that reads---. WTF. The driver rear says it has 31 psi in it but I didn't get the two honks saying its done. Any ideas. I had a nail in my tire and the pass rear went low with the DIC still reading 33 psi in it. I have tried to re- program fours times over the last month all with the same outcome.

RippyPartsDept
12-16-10, 05:32 PM
Did you rotate without resetting?...

JFensty
12-16-10, 07:03 PM
Did you rotate without resetting?...

i tried to reset after the driver frt starting going in and out. Then I rotated and have tried three times since to reprogram. Its hard to get to the dealer due to when I work but I think I may have to make a trip. Will their computer be able to reprogram even if it isn't working manually?

RippyPartsDept
12-16-10, 07:30 PM
if the sensor has gone bad then nothing will work ... sounds like that may be the case here...

D3l7a3ch0
12-16-10, 09:02 PM
if there's no double honk then it probably didn't take--and what it's showing for "--" as the driver front tire is actually the driver rear tire that's not responding. what's the battery life on these sensors?

JFensty
12-17-10, 11:49 AM
if the sensor has gone bad then nothing will work ... sounds like that may be the case here...

I figured that was the case, but I do get a honk on Driver front when I let pressure out. That indicates it is getting a reading Correct?:hmm: But yet it still reads "---". The pass. rear that was low still read ~33psi even tho it only had 10 psi. I don't want to replace the wrong one and waste money.:banghead:

Thanks for the help.

Just a little more info, I purchased the car back in Sept '10 and the Dvr frt was not reading at the time of sale. Two days later it came on and stayed on for weeks with no issue. Then went out and has not came back on since. Which is why I have tried to re-program manually and rotate and re-program. Really have no other issues with the car electronically with radio or the like.

Twitch
12-17-10, 01:13 PM
One of mine went bad last year. Front tires both honked and were programed. But when I got to the RR it would not honk. So I pulled out one of my winter rims, used it in place of the RR. It honked and I moved on to the last rim (LR). Now I have three reading correctly, with "--" in the RR.

What I'm saying is, if one is bad, you'll have to skip that one and the next tire will show in its place. Or just move it to the LR (if you can) and the other three will read correctly until you can get a new sensor.

Tony

repenttokyo
12-17-10, 02:20 PM
if there's no double honk then it probably didn't take--and what it's showing for "--" as the driver front tire is actually the driver rear tire that's not responding. what's the battery life on these sensors?

rfid sensors don't use a battery, they get their power from the signal that is transmitted to them from the reader.

Aurora40
12-17-10, 02:52 PM
I figured that was the case, but I do get a honk on Driver front when I let pressure out. That indicates it is getting a reading Correct?:hmm: But yet it still reads "---". The pass. rear that was low still read ~33psi even tho it only had 10 psi. I don't want to replace the wrong one and waste money.:banghead:


Just a guess, but perhaps it reverts to the previous programming if your attempt is unsuccessful. Which is why it shows the wrong wheel as having a dead sensor.

RippyPartsDept
12-17-10, 02:56 PM
the car doesn't know you've rotated the tires until you fully program all four tires... so the readings are for where the tires used to be... unless i'm misunderstanding the situation

edit: Aurora40 is correct... it won't shuffle around the location of the tires until you get the ending double honk ... notifying you that the car knows which tire is which and that they're all reading okay

JFensty
12-17-10, 05:30 PM
Does it have to be mounted on the car to be programmed? Meaning, if I use my spare to "fool" the system (leave in trunk, until I get the sensor replaced or exchange rims). That way I can at least get to comp mode or turn off stability sys. Not too concerned if it is actually reading the real pressure. Just want to use those functions.

ctsv154
12-17-10, 06:48 PM
Does it have to be mounted on the car to be programmed? Meaning, if I use my spare to "fool" the system (leave in trunk, until I get the sensor replaced or exchange rims). That way I can at least get to comp mode or turn off stability sys. Not too concerned if it is actually reading the real pressure. Just want to use those functions.

No, it doesn't need to be mounted. As long as the car can see it electronically you're good.

RoverGuy7
12-17-10, 11:10 PM
the sensors do have batteries in them, most manufactures expect 7+ years of function from them, dont know what gm says itll be though. i agree you just have a bad sensor in the lr wheel. since it doesnt monitor the spare, id just take it somewhere and have them swap the two sensors, then you should be able to program it up fine and have it be functional

repenttokyo
12-18-10, 02:15 PM
the sensors do have batteries in them, most manufactures expect 7+ years of function from them, dont know what gm says itll be though. i agree you just have a bad sensor in the lr wheel. since it doesnt monitor the spare, id just take it somewhere and have them swap the two sensors, then you should be able to program it up fine and have it be functional

why would the tire's RFID tags have batteries in them? I don't see why our tires would be active RFID's for the function they serve.

http://www.technovelgy.com/ct/Technology-Article.asp?ArtNum=2

mstrjon32
12-18-10, 02:35 PM
I don't think the TPMS sensors are actually RFID. They communicate on the same channel that the remotes use, just a standard radio signal. RFID is usually much closer proximity than the sensors operate at, anyway.

RoverGuy7
12-18-10, 04:37 PM
there are no initiators or anything, just the sensors an antenna, and the module(which i believe is integrated into the i/p) the sensors know when the car is moving based on centrifugal force, and send signals that are picked up by the antenna module when they think they should, at different time intervals based on whats happening... less often when stationary, more often when moving, and they are forced to repeat their signals when pressure changes, thats why they can be programed by changing the pressures, once in 'learn' mode, the module just looks for the repeated signals as ties it to a wheel position

RippyPartsDept
12-18-10, 04:43 PM
yeah two different things here... RFID tags in tires VS the TPMS sensors (valve stem Tire Pressure Monitor System sensors)

repenttokyo
12-18-10, 07:23 PM
there are no initiators or anything, just the sensors an antenna, and the module(which i believe is integrated into the i/p) the sensors know when the car is moving based on centrifugal force, and send signals that are picked up by the antenna module when they think they should, at different time intervals based on whats happening... less often when stationary, more often when moving, and they are forced to repeat their signals when pressure changes, thats why they can be programed by changing the pressures, once in 'learn' mode, the module just looks for the repeated signals as ties it to a wheel position

too bad we couldn't use that rotational force to charge a battery.

kevm14
12-18-10, 10:14 PM
Yeah I wondered about that myself. But if the originals last 8 years, that's not too bad. Also, RFID seems most useful when it simply responds with a set code when stimulated. TPMS sensors have transducers to change pressure into an electrical signal, obviously. So the RF signal varies.

Aurora40
12-19-10, 10:33 AM
too bad we couldn't use that rotational force to charge a battery.

That is how they worked on my 1990 Corvette. They used piezo-electrics to power the sensor. However, they don't send a signal until the car gets rolling. In theory, they would last forever, but back then they were mounted on straps across the center of the wheel, vs tucked in by the valve-stem. And they invariably get broken off by tire shops.

They also don't send a specific pressure back to the car. I don't know if that is why newer ones use batteries, because the circuits to drive sending a specific pressure need too much juice? Or if they just want to sell more replacement sensors?

Oh5V
12-26-10, 03:28 AM
the sensors use a 3v coin style battery...

http://i32.photobucket.com/albums/d50/SmokingSS/online/5.jpg


Im in the process of making a TPMS Emulator setup for my V. I just finished all the wiring diagrams tonight for the most part, just gotta power one up and start testing some stuff.

And as for those saying something about the transmitter not really near the valve stem and more inside the rim, that's incorrect.
The sensor actually uses the valve stem as the antenna.

JFensty
12-28-10, 05:32 PM
How did you disassemble your TPMS? Took me a while but pretty sure it wasn't usable when I got mine to look like yours. Are the tabs soldered on to the battery?

DDS rollin a CTS
11-29-11, 06:59 PM
A tip to any of you reprograming your tpms's that I just learned the hard way...dont close your door when you get out to let air out of the tires, you might have locked the doors when you hit lock/unlock on the fob and therefore your door may lock behind you when you get out.

612WharfAvenue
11-30-11, 03:18 PM
I'm paranoid about that door stuff. If I'm doing something that requires the keys being in the car and me outside I generally roll down the window. I need to do this TPMS relearn, my L/R are switched.

CadzillaTN
11-30-11, 05:59 PM
Just remember you don't have to continually put air in/out of the tire waiting for a honk, a one second burst if either will do the trick, just hit it and be patient...