Flat Tire Monitor

RyBMW · 07-16-2007, 06:36 PM

So I leave for Montreal from NYC this morning. About less than 50miles into the trip, I get a flat tire warning. I was able to pull over to the shoulder to reset the tire monitor but I couldn't check the pressure. I had to drive about 10miles until there was a rest area. During that 10miles the FTM didn't go off again. So I check the pressure and all 4 tires were above 35psi but it wasn't set to the correct psi for each tire. I just had my driver side rear tire replaced about 2 weeks ago. I know the tech checked all 4 tire pressure. I guess he didn't fill it up correctly. I'm not even sure if he reset the FTM when they changed the tire and added more air to each tire.

So I adjusted all 4 tire pressure to the correct psi and reseted the FTM. Than I drove about over 400miles. The FTM didn't go off again.

So why did my FTM go off? Dealer didn't reset the FTM? But I did drive a few times after the tire change. Why go off now? I did leave my car parked in the underground garage for about over a week. It's a little cool there. And the tires do get flatspot. I left early in the morning when the weather was still cool than maybe the tires heated up and caused the FTM to go off?

So if I was able to drive an additional 400 miles without the FTM going off, does that mean that the tires are fine?

Well I'm in Montreal now.

TopDown · 07-16-2007, 08:24 PM

From the owner's manual:

Functional requirement
In order to assure the reliable reporting of a flat tire, the system must be initialized for the correct tire inflation pressure.

System limitations
In the following situations, the system could be delayed or malfunction:
> System has not been initialized
> Driving on snowy or slippery road surface
> Performance-oriented style of driving: slip in the drive wheels, high lateral acceleration
> If snow chains are attached

RyBMW · 07-16-2007, 11:26 PM

Interesting. I must have not read the system limitations section thoroughly.

DFW_M · 07-17-2007, 08:18 AM

that system is crap!
Same happened to me...a few posts below.
Turned out it was the computer malfunction. So unreliable for a very important thing...

07-16-2007, 06:36 PM	#1
RyBMW Major 79 Rep 1,038 Posts Drives: X5 Join Date: Jun 2005 Location: NYC iTrader: (1) Garage List 2012 BMW X5 [0.00] 2008 335i [0.00]	Flat Tire Monitor So I leave for Montreal from NYC this morning. About less than 50miles into the trip, I get a flat tire warning. I was able to pull over to the shoulder to reset the tire monitor but I couldn't check the pressure. I had to drive about 10miles until there was a rest area. During that 10miles the FTM didn't go off again. So I check the pressure and all 4 tires were above 35psi but it wasn't set to the correct psi for each tire. I just had my driver side rear tire replaced about 2 weeks ago. I know the tech checked all 4 tire pressure. I guess he didn't fill it up correctly. I'm not even sure if he reset the FTM when they changed the tire and added more air to each tire. So I adjusted all 4 tire pressure to the correct psi and reseted the FTM. Than I drove about over 400miles. The FTM didn't go off again. So why did my FTM go off? Dealer didn't reset the FTM? But I did drive a few times after the tire change. Why go off now? I did leave my car parked in the underground garage for about over a week. It's a little cool there. And the tires do get flatspot. I left early in the morning when the weather was still cool than maybe the tires heated up and caused the FTM to go off? So if I was able to drive an additional 400 miles without the FTM going off, does that mean that the tires are fine? Well I'm in Montreal now. __________________ New: 12 X5 xDrive35i Premium Alpine White/Cinn Brown Old: 08 E92 335i\|Space Gray/Coral Red/Gray Poplar Old: 06 E90 330i\|Black Sapphire/Black /Burl
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07-16-2007, 08:24 PM	#2
TopDown Captain 93 Rep 615 Posts Drives: 2017 G30 540i M Sport Join Date: May 2007 Location: SoCal iTrader: (0) Garage List 2002 BMW Z3 Roadster [0.00] 2007 BMW 335i Coupe [0.00] 2012 BMW 335i Sedan [0.00] 2006 BMW M Roadster [0.00] 2017 BMW 540i [0.00] 2015 BMW 428 Gran C ... [0.00]	From the owner's manual: Functional requirement In order to assure the reliable reporting of a flat tire, the system must be initialized for the correct tire inflation pressure. System limitations In the following situations, the system could be delayed or malfunction: > System has not been initialized > Driving on snowy or slippery road surface > Performance-oriented style of driving: slip in the drive wheels, high lateral acceleration > If snow chains are attached __________________ Mine G30 540i M Sport Hers F36 440i Gran Coupe
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07-16-2007, 11:26 PM	#3
RyBMW Major 79 Rep 1,038 Posts Drives: X5 Join Date: Jun 2005 Location: NYC iTrader: (1) Garage List 2012 BMW X5 [0.00] 2008 335i [0.00]	Interesting. I must have not read the system limitations section thoroughly. __________________ New: 12 X5 xDrive35i Premium Alpine White/Cinn Brown Old: 08 E92 335i\|Space Gray/Coral Red/Gray Poplar Old: 06 E90 330i\|Black Sapphire/Black /Burl
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07-17-2007, 08:18 AM	#4
DFW_M Major General 1783 Rep 6,669 Posts Drives: 991.1 C2Sc Join Date: Jul 2006 Location: Dallas, TX iTrader: (4)	that system is crap! Same happened to me...a few posts below. Turned out it was the computer malfunction. So unreliable for a very important thing...
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