AC compressor will only kick on when commanded through JBE functions
 

Hello, I'm new to the site specifically to ask someone with some more in-depth knowledge for some direction or maybe something I'm just missing.

I own and operate a vehicle repair facility. A customer brought me a 2012 x5 50i with inoperative ac, she had another shop firing the parts cannon at it and couldn't fix it. They had replaced the ac compressor and the refrigerant pressure sensor, and evacuated and recharged the system. Pressures with the system off and ambient temp of around 80 degrees is about 75 psi.

After an initial scan of the vehicle with my Autel Maxisys Pro I found the refrigerant pressure sensor registering over 1800 psi, and subsequently the ac compressor not being commanded on. I tested the sensor, the circuit between the sensor and the JBE, and determined the JBE was faulty. My customer didn't want to pay the dealership price for a new JBE, so we opted to order from BMWsupport. I replaced the JBE and the block it was attached to, programmed and coded it, and verified at that point a normal value from the refrigerant pressure sensor. The ac system function says it is on in my data, but the compressor is not kicking on. I can go into the special functions/active test in the JBE and command the compressor on and it kicks on, so the compressor circuit doesn't have any issues.

I have no faults set in any modules, no lights on dash, nothing to indicate anything wrong with the system except it doesn't ever kick the compressor on.

I'm ready to get my customer back in their vehicle, so any help is greatly appreciated.

All associated modules are properly programmed? To the appropriate rev level??

Not much help I know....GL

Yes, I'm sure of it, although that was by accident. I disconnected the battery at one point without much thought and had to check the program and coding of every module in the vehicle to get everything else back to normal function.

Can you access any of the BMW testplans for this issue, via that autel system?

Also, where is NWA? Be very happy to find talented indys to recommend around here.. (northwest arkansas?)

I am sure you have this...and not sure it really helps...but:

https://www.newtis.info/tisv2/a/en/e...ioning/1w8PynP

So #8 tells #5 to engage. Ideally. But no clues as to the logic...something is preventing #8 from commanding.

Re-code the IHKA?

https://www.newtis.info/tisv2/a/en/e...-conditioning/


Hope someone drops in with better ideas....