General Category > General Discussion
Tyre Pressure TPMS / Wake-Up tool for RDC
e7navy1999:
issue: My rear TMPS K1600 2012 is reading 7-8psi low. Actual tire pressure is 40-41psi, TMS reads 32-33psi. I suspect the Rear TPMS is bad. I tried to do the rapid decompression of the rear tire a few times. The Canbus responds as designed with a red triangle and the engine going into "LIMP" mode so I know the computer and TPMS are talking. For some reason the Rear TPMS became un-calibrated. I suspect it is toasted. My BMW dealer said they have issues with many of the TPMS sensors doing this. They told me to try the rapid decompression a few times and that sometimes wakes the TPMS up and calibrates it. A new BMW OEM TPMS is $220usd. Another kidney donation!
This is what I will try as my next step to troubleshoot the 7-8psi discrepancy in my rear k160 TPMS. 1. I purchased a : https://www.amazon.com/gp/product/B074MWMNL5/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 EL-50448 TPMS tool for $16 from Amazon. 2. I also purchased two new CR2032 batteries with wires : https://www.amazon.com/gp/product/B00XYSW3R8/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 about $12 total. 3. I purchased two new TPMS sensors from ....YES China: https://www.ebay.com/itm/8532732-Tire-Pressure-Monitoring-Sensor-New-For-Fits-BMW-Genuine-High-Quality/253672435640?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 8532732 Tire Pressure Monitoring Sensor New For Fits BMW Genuine High Quality $25 each. free freight
I read on a previous blog that these new TPMS from China work on most BMW's 2012 to current year but that the battery they come with may be old...thus the new CR2032 battery with wires. You can not solder the lithium battery as they get hot and it ruins them. I do not like the idea of using a holder or just the existing metal prongs with hot glue to hold the battery in place. Regular riding it would be find but once you hit some speed bumps or potholes at 80mph i think the battery would dislodge. I plan to remove the glue in the new Chinese TPMS , TPMS, dig out the old battery and solder in new batteries using the wires directly to the terminals. The next battery change in 3-5 years would be a really fast operation. Since the CR2032 has a wire I will just epoxy the new battery an inch away from the new TPMS. During a future changeout I just break the glue and put in a new battery with epoxy...should take about 5 minutes each.
Why the EL-50448: The chinese TPMS do not seem to have a serial number on them. This would read the TPMS during wake up mode and give the serial number for my GS911 input. https://www.hexcode.co.za/products/gs-911/procedures/rdc The EL-50448 will also be able to test the Chinese battery and I may not even need to use the new wired CR2032 batteries this time around. I will keep ya all posted
BALVIAMBE:
Hi,
i did the soldering on the battery and it is working fine already 2 years now. bad reading can be caused by battery also. just change it bro and all be fine. good luck.
Jughead:
@e7navy1999
Make sure that the TPM sensor you order from China operates at the correct frequency. It needs to be one that communicates at 433MHz.
e7navy1999:
BALVIAMBE, Thanks for the bad battery tip. I was going to try that first, The EL-50448 is suppose to be able to test the battery remotely. I will try that out today. The Chinese TPMS for $25 is suppose to be 433mhz.
BALVIAMBE:
hi,
tpms should be 433 mhz that is it change battery bro all will work fine.
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