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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > HKE CMA31-CM Relay

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      02-15-2017, 09:58 AM   #1
Second Lieutenant

Drives: 2008 e90 335xi
Join Date: Feb 2011
Location: Bridgeport, WV

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HKE CMA31-CM Relay

I purchased a 335i with upgraded RB turbos, inlets and the whole shebang. Car has been running fine for months and still does, but lately I have noticed that this relay has been clicking super fast constantly under the hood. I think the previous owner did the coolant expansion tank relocation so I don't believe this is the original location of said relay.

Anyone know what it controls? Advanced Auto said it was for the O2 sensor. When I unplug it, I lose my HIDs, so I am all over the place with it. I bought a replacement, but it clicks as well so I am thinking the relay itself is fine. It does seem to be making more exhaust which would make sense with the "O2" theory, but then why would I lose my HIDs when it is pulled

Here is an image of it. If anyone has any ideas, I'd appreciate it.

2009 BSM E92 AT 335i - RB Turbos - MMP Inlets - AA Race FMIC - AP DPs - KW V1s - RB PCV - N20 MAP - Rotora Forged BBK - VRSF CP w/ Tial BOV - Fuel It Stage 2 LPFP - Alpina TCU Flash

Last edited by blbrchnk; 02-15-2017 at 02:04 PM.
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      02-15-2017, 02:25 PM   #2
Major General

Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

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Why would you think you would get and answer to this in
the stereo bluetooth section and not the general or motor
section( sub forum)
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