Highly Technical Question

nick776 · 11-21-2014, 05:28 PM

I have a highly technical question. I have searched and read all the F30 technical documentation on this site as well as a competitor's site and cannot find my answer. My question is this: Where, EXACTLY, is the TPM antenna for the newer version TPM monitor (2015 model). My understanding is that the antenna is shared with the key fob remote antenna but I simply cannot find its location. I know the older "flat tire monitor" used a different antenna system. However, the newer system (which uses all new wheel sensors) uses a different setup.

Does anyone know the answer? Where is the actual receiving antenna located? Is it within the FEM (front electronics module), REM (rear electronics module), in the C Pillar of the rear window, or somewhere else entirely?

S4NoMore · 11-21-2014, 05:38 PM

I doubt there is an antenna, my understanding is that the system uses wheel speed data from the ABS sensors to calculate differences - a tire low on air will have a smaller effective rolling diameter and will rotate faster.

Tirerack has info here: http://www.tirerack.com/tires/tirete...&affiliate=HK8

Mike_L · 11-21-2014, 06:08 PM

Huh? It was changed for 2015? I know the old one had an antenna in each wheel well. Didn't know it was changed.

nick776 · 11-21-2014, 07:08 PM

The old system used wheel speed data to determine pressure loss. The new system monitors each tire independently. My dealer said the antenna is integrated with the key fob antenna, but that does not make sense to me.

There are lots of threads about the changeover. I think it actually occurred during late 2014 model production. It uses different components.

Mike_L · 11-21-2014, 07:11 PM

Quote:

Originally Posted by nick776

The old system used wheel speed data to determine pressure loss. The new system monitors each tire independently. My dealer said the antenna is integrated with the key fob antenna, but that does not make sense to me.

There are lots of threads about the changeover. I think it actually occurred during late 2014 model production. It uses different components.

No, thats not right. The old system has pressure sensors in each tire. I can pull up exact pressure and temperature readings in my DIC on the 7, as can coded 3's.

tturedraider · 11-21-2014, 07:20 PM

Quote:

Originally Posted by nick776

The old system used wheel speed data to determine pressure loss. The new system monitors each tire independently. My dealer said the antenna is integrated with the key fob antenna, but that does not make sense to me.

There are lots of threads about the changeover. I think it actually occurred during late 2014 model production. It uses different components.

The last year that system was used was MY 2006.

nick776 · 11-21-2014, 07:29 PM

My dealer told me the system changed this past spring, I'm trying to figure out WHAT, exactly, changed.

snowghost · 11-21-2014, 07:40 PM

Quote:

Originally Posted by Mike_L

No, thats not right. The old system has pressure sensors in each tire. I can pull up exact pressure and temperature readings in my DIC on the 7, as can coded 3's.

+1 Mine is coded for PSI and Temp.

ronanz · 11-21-2014, 09:13 PM

Quote:

Quote:
Originally Posted by Mike_L
No, thats not right. The old system has pressure sensors in each tire. I can pull up exact pressure and temperature readings in my DIC on the 7, as can coded 3's.

Quote:

Originally Posted by snowghost

+1 Mine is coded for PSI and Temp.

mine coded as well...

COKen · 11-21-2014, 09:53 PM

It's on the gas tank strap ...

http://www.realoem.com/bmw/showparts...93&hg=36&fg=15

nick776 · 11-22-2014, 10:01 AM

Thanks!

Weaselboy · 11-22-2014, 10:18 AM

Quote:

Originally Posted by nick776

My dealer told me the system changed this past spring, I'm trying to figure out WHAT, exactly, changed.

I think what your dealer is referring to is the newest models now show actual tire pressure in the iDrive screen rather then just a low pressure message. The system (hardware) actually is the same and tracked pressure all along, it just was not shown in iDrive. The new software just allows the hardware to now show the pressure.

nick776 · 11-22-2014, 10:31 AM

I suspect that is the case, I know my last F30 did NOT show tire pressure, but the newer ones do. I did not know the capability was always present.

11-21-2014, 05:28 PM	#1
nick776 Private First Class 78 Rep 169 Posts Drives: BMW Join Date: Sep 2005 Location: Montgomery, AL iTrader: (0)	Highly Technical Question I have a highly technical question. I have searched and read all the F30 technical documentation on this site as well as a competitor's site and cannot find my answer. My question is this: Where, EXACTLY, is the TPM antenna for the newer version TPM monitor (2015 model). My understanding is that the antenna is shared with the key fob remote antenna but I simply cannot find its location. I know the older "flat tire monitor" used a different antenna system. However, the newer system (which uses all new wheel sensors) uses a different setup. Does anyone know the answer? Where is the actual receiving antenna located? Is it within the FEM (front electronics module), REM (rear electronics module), in the C Pillar of the rear window, or somewhere else entirely?
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11-21-2014, 05:38 PM	#2
S4NoMore Major 253 Rep 1,003 Posts Drives: 16 340i, 15 X3d, 91 318i Join Date: Aug 2008 Location: Philly suburbs iTrader: (2) Garage List 2016 BMW 340i [0.00] 2015 BMW X3 28d [0.00] 1991 BMW 318i [8.66]	I doubt there is an antenna, my understanding is that the system uses wheel speed data from the ABS sensors to calculate differences - a tire low on air will have a smaller effective rolling diameter and will rotate faster. Tirerack has info here: http://www.tirerack.com/tires/tirete...&affiliate=HK8
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11-21-2014, 06:08 PM	#3
Mike_L Banned 283 Rep 1,961 Posts Drives: 2015 335xi GT M-Sport MPPK Join Date: Jun 2013 Location: New York City iTrader: (2)	Huh? It was changed for 2015? I know the old one had an antenna in each wheel well. Didn't know it was changed.
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11-21-2014, 07:08 PM	#4
nick776 Private First Class 78 Rep 169 Posts Drives: BMW Join Date: Sep 2005 Location: Montgomery, AL iTrader: (0)	The old system used wheel speed data to determine pressure loss. The new system monitors each tire independently. My dealer said the antenna is integrated with the key fob antenna, but that does not make sense to me. There are lots of threads about the changeover. I think it actually occurred during late 2014 model production. It uses different components.
	Appreciate 0 Quote

11-21-2014, 07:29 PM	#7
nick776 Private First Class 78 Rep 169 Posts Drives: BMW Join Date: Sep 2005 Location: Montgomery, AL iTrader: (0)	My dealer told me the system changed this past spring, I'm trying to figure out WHAT, exactly, changed.
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11-21-2014, 09:53 PM	#10
COKen Lieutenant Colonel 981 Rep 1,560 Posts Drives: M Rster / Z4 M40i / X5 M50i Join Date: Dec 2013 Location: Colorado iTrader: (0)	It's on the gas tank strap ... http://www.realoem.com/bmw/showparts...93&hg=36&fg=15 __________________ 2002 M Roadster, Steel Gray Metailic, Gray Nappa Leather, HT, TC Kline DA Shocks & Camber Plates, w/H&R Springs, Stromung Exhaust, SSR Type C. Looking for new home. 2022 Z4 M40i, Misano Blue Metallic, Driver Asst Pkg, Prem Pkg 2023 X5 M50i, Phytonic Blue, Black Extended Merion Leather, Driving Asst Pro Pkg, Park Asst Pkg, Exec Pkg, Climate Comfort Pkg.
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11-22-2014, 10:01 AM	#11
nick776 Private First Class 78 Rep 169 Posts Drives: BMW Join Date: Sep 2005 Location: Montgomery, AL iTrader: (0)	Thanks!
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11-22-2014, 10:31 AM	#13
nick776 Private First Class 78 Rep 169 Posts Drives: BMW Join Date: Sep 2005 Location: Montgomery, AL iTrader: (0)	I suspect that is the case, I know my last F30 did NOT show tire pressure, but the newer ones do. I did not know the capability was always present.
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