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Old 07-03-2011, 06:02 AM   #1
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TPMS light NOT coming on?

I switched out rims/tires earlier this week. I removed stock wheels (which had tpms) from my 2009 and installed wheels from a 2007 (without tpms). Strange thing is the dash light/chime has not come on. Its been a few days and almost 100 miles and still nothing. The newly installed wheels were already mounted/balanced when I got them, but I am fairly certain there are no tpms installed (they have black rubber valve stems) .. any idea why no dash light?

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Old 07-03-2011, 07:13 AM   #2
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It takes a little while for some reason but eventually it will light up. Mine took about a week and now won't go away

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Old 07-04-2011, 04:58 AM   #3
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My 2010 has black rubber valve stems - and the TPMS

Try dropping a tyre down below 30psi and see what happens?
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Old 07-04-2011, 08:23 AM   #4
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It took three days for mine to come on after a wheel change.
The stems on my 2010 are rubber with the TPMS, they are not as flexible as the plain rubber valve stem though.
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Old 07-04-2011, 02:54 PM   #5
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Well, I aired down to about 15psi and still nothing. The black valve stems are pretty flexible - so at this point it doesn't look like the wheels have tpms installed. Don't know why the dash light hasn't come on yet, but I think I'll hang on to the Procal I ordered for whenever the light decides to show itself.
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Old 07-04-2011, 04:13 PM   #6
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Originally Posted by pas914 View Post
Well, I aired down to about 15psi and still nothing. The black valve stems are pretty flexible - so at this point it doesn't look like the wheels have tpms installed. Don't know why the dash light hasn't come on yet, but I think I'll hang on to the Procal I ordered for whenever the light decides to show itself.
If you have regular valve stems, the TPMS will never come on. The central module, powered by the Jeep battery is a receiver. It monitors the "airwaves" waiting for one of the wheel TPMS modules (internal battery powered) to transmit. Each one has a digital address. When you rotate your tires and do the "reset", the main module polls the tires, to figure out which one is where.

Since you don't have the wheel modules, the main unit has nothing to monitor, so it reverts to "standby mode". So the dash light should never come on.

Do you still have the original wheels and tires? Park your Jeep near them and air down one of them. See if the light comes on.

Too much info?
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Old 07-04-2011, 05:59 PM   #7
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Definitely not too much info -- I apprec the response. That was pretty much the way I understood it to begin with - except for the part about the light never coming on when the receiver fails to get a response from the tpms. It seems like many people on this (and other) forums have had the tpms light on indefinitely once switching to wheels without sensors. If I am understanding you correctly, you are saying that the warning light will never come on while running rims/tires without sensors???
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Old 07-04-2011, 06:24 PM   #8
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Definitely not too much info -- I apprec the response. That was pretty much the way I understood it to begin with - except for the part about the light never coming on when the receiver fails to get a response from the tpms. It seems like many people on this (and other) forums have had the tpms light on indefinitely once switching to wheels without sensors. If I am understanding you correctly, you are saying that the warning light will never come on while running rims/tires without sensors???
Correct. There is nothing for the vehicle TPMS module to sense, so it turns itself off. Now, if you ever reinstall TPMS modules, in the wheels, you will have to do the whole "reset" thing. To get the vehicle TPMS to acknowledge them.

AND, I am not a TPMS expert, but I have worked with similar systems, somewhere.
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Old 07-04-2011, 06:36 PM   #9
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Let me make one disclaimer.

I had the ability to modify the system after I removed the modules. My system was laptop controlled. I could turn off individual sensors, or the entire system.

My understanding is you can turn off the system with some of the off-the-shelf programmers, but not the individual sensors.
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Old 07-04-2011, 06:51 PM   #10
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Originally Posted by pas914 View Post
I switched out rims/tires earlier this week. I removed stock wheels (which had tpms) from my 2009 and installed wheels from a 2007 (without tpms). Strange thing is the dash light/chime has not come on. Its been a few days and almost 100 miles and still nothing. The newly installed wheels were already mounted/balanced when I got them, but I am fairly certain there are no tpms installed (they have black rubber valve stems) .. any idea why no dash light?
Consider yourself lucky my light is on since i got tired of replacing the sensors when i accidentally crushed them wheeling.That would be 2 years ago.

They do take awhile to come on.
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Old 07-04-2011, 06:51 PM   #11
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Correct, one way to "turn the system off" (in effect) is to use the AEV Procal (or similar aftermarket device) to set the minimum/alert psi to "0 psi" .. that was my intention when I picked up a Procal. I have now had the wheels on for a week or so and still no light. If the light is never going to come on, I may just box up the Procal and ship it back since it still hasnt been used.

It's just that I can forsee the light coming on the minute I ship the procal back -- Murphy's Law!
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Old 07-06-2011, 11:30 PM   #12
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Funny thing happened on the way to work this morning -- I got a TPMS dash light & alert chime ... for those who said it takes a little while to come on, you were absolutely right! About a week or so in my case. Glad I didnt send the Procal back -- used it this evening and it works like a charm.

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