General Category > General Discussion
Tyre Pressure TPMS / Wake-Up tool for RDC
wmdowdy:
i have the ATEQ VT-31, paid $119 for it and it wakes my sensors up instandly and displays the sensor number and the tire pressure. Works on my Audi Q7 also
e7navy1999:
UPDATE Sept: I opened up the rear tired by just breaking one side of the bead. Form there I was able to step on the tire and crush it done to make for plenty of room to remove the TPMS. The old battery measured 2.67 DCV, The new battery measured 3.47 volts. I followed the "de-glue" procedure mentioned earlier by a poster on this same link. (took about 30 minutes) I soldered in the Black wire to negative (bottom tab) and red to positive (upper tab). I did NOT fill in the cavity of the old TPMS with anything...just left it open. Maybe I should have to help keep moisture out? Anyways I have to put on a new rear tire in about 1000 more miles so can do it then. The existing BMW TPMS terminal clips are extremely sturdy and solder very well. The next battery change out will be very simple...maybe a 5 minute job at most. The new battery has two 2" long leads (+red/black-). With ignition key on and tire not mounted but nearby the bike: I filled the tire with 40psi, proceeded with a rapid depressurization which "woke-up" the rear TPMS sensor then proceeded to fill up to 40 PSI. The display ready 44PSI, Tire read 40PSI. Better then the 8PSI difference I originally had but still not perfect. Good enough? I will run this pressure for a few weeks and see if it calibrates over time. If it does not I will install the Chinese TPMS once it arrives next month during my tire change-out. One odd issue: the CR032 is thinner then the OEM battery that is labeled 11Y8Ou, same voltage
e7navy1999:
I Phoned a local battery supply shop. The CR2032 is exactly 1/2 the thinkness of the OEM BMW TPMS battery. Part number listed previous post. They recommend me to double up the CR2032 so as to get 3volts. The combined batteries should last just as long as the OEm battery. The German battery is not available in the USA and they said appears to be a custom application battery made just for BMW. I decided to just use a single battery and replace it every other tire change. I will replace the front battery next month during a tire replacement as well
e7navy1999:
Awe found it. The TPMS Battery is actually a CR2050HR. Ebay: https://www.ebay.com/itm/4-PCS-Maxell-CR2050HR-Lithium-Buttom-Battery-3V-Coin-Cell-Tab-welded/182085577865?epid=1065216573&hash=item2a65256c89:g:HAAAAOSwJQdXCAC-:rk:2:pf:0. About $5 each. The CR2030 will work but maybe not for many years.
Inspector Gadget:
Likely being the CR2032HR variant (=Heat Resistant, temperature-range from -40 degrees Celsius to +125 degrees Celsius)
The CR2032HR's thickness (height) is 3.2mm versus the CR2050HR 5.0mm
So a difference is 1.8mm, which is not that much difference, as there is in that respect "plenty room" within the BMW TPM Sensor to mount them.
The bigger difference is the mAh-values, meaning how much current it can maximum provide measured per hour, before it drops to 2.0 volts (the state at which it should be considered "empty")
The CR2032HR ia 200mAh, whilst the CR2050HR is 350mAh.
(but the CR2032HR has a higher acceleration Resistance of maximum 3300 G's versus 2000G's, which is, according to the manufacturers equivalent to acceleration when driving at 300km/h & using a 17-inch wheel)
Bottom-line: the CR2050HR should a fine replacement (too) for a dead battery and probably will last a bit longer versus the CR2032HR.
Getting a slight difference in reading the actual pressure often comes down to what tool you are using as a reference to compare the measurements with.
El cheapo tyre-pressure readers often give very slanted results.
Whilst investment in a good digital or analoge reader often give more accurate results.
TPM sensors, including BMW's, are so-called temperature-compensated.
Meaning, the pressure displayed on your dashboard is the pressure as if the tire is at 20 degrees Celsius.
Which a tire seldom is, hence also the reason the pressure does increase when the tyre does get warm.
Therefore you should always measure the pressure before riding and preferably pressurise your tyres a wee bit above but never below the desired pressure.
Where it really comes down to your personal preferences, and your brand of current tyres, but not excluding what the motorcycle manufacturer states in the user manual about tyre-pressures.
I like harder tyres as the bikes rolls & corners better for me, compared to what BMW dictates in my user manual.
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