The clock on my 2014 835i is notoriously fast, gains 15 min per month. As to the ambient temp gauge, I noticed that as soon as I got my Gator and have been planning to investigate. I was at the dealer parts counter and asked about purchasing connector pigtails for the two IP connector plugs. They are not available but a mechanic heard me and gave me a cutoff IP connector with all the leads. So I plan to put leads in the unused positions and experiment. I suspect that if a thermistor was connected across the correct terminals, the display would stay on and read ambient temp. And there should also be a terminal which can be grounded or not to select F or C. Here is a pic of the terminal pinouts if you want to try it. I will post my results if and when I get time to do it. Not really necessary but if the panel has the capability, I want to use it!
I did this and sure enough it worked. Used a thermistor salvaged from an automobile AC system. I need to find the correct thermistor or add a resistor to calibrate this one because it reads 43* when the temp is really about 68*. But I am on the right path... Did not find a way to make it read C, you Kanucks will have to figure out how to make it parler le Francaise.
Great news, once complete if you could kindly post part numbers, source of parts and instructions that would be awesome!
OK, Boss , I'll get right on it. Reality: I have been trying for several days to figure out what thermistor to use. The IP is made in India by PRICOL, pn P10-007-00A, J-D pn AM144638 but the Pricol website shows only newer model IPs. My testing shows a desired T25 value (resistance @ 25*C) of 2.766k ohms. That resistance gives a reading of 77*F on the IP. This may or may not correspond to an industry standard product. And it would only be accurate at 25*C / 77*F unless the Beta value is right. I cannot calculate the Beta value because the equation includes a factor 1n, which is evidently a standard mathematical factor that everyone knows and recognizes except me, because nobody explains that factor in their detailed instructions of how to calculate Beta value. The 1 may represent a Greek letter that was not in the fonts? I get confused trying to convert Centigrade to Dog Years. Whatever, my best bet is to find a vehicle of some sort built ca. 2014 that used the same IP and order an ambient temp sensor for that vehicle. Anybody been in the Indian Subcontinent and recognizes the IP from something else? (refer to photos above) Before I retired I would have had access to many sensors to do trial and error testing, but ordering a slew of them in hopes of finding the correct one is not practical. Any electronics Engineers out there? Let's get a team effort going... Edit: To clarify, the thermistor that will make a 825i Gator read ambient temp accurately must have a nominal resistance value (T25) of 2.766k ohms at 25*C. I determined this by adjusting a potentiometer to give an IP display reading of 77*F and then measuring the resistance of the test pot. It also needs the correct Beta factor. Beta determines the shape of the curve of a graph of resistance / temperature. Most temp sensors do not give this technical data, they are just listed by application. Generic thermistors are available cheap with detailed specs but require calculations and testing to get it matched to the IP requirements. So our best chance is to figure out what other vehicles used the same Pricol instrument panel back around 2014. Temp sensor for one of those should work.
