Start/Stop Button Intermittently Unreaponsive

MikeYQM · 02-11-2024, 04:27 PM

Hi all, I have an E92 M3 and for the last few driving months, the Start/Stop button has been intermittently totally unresponsive.

Typically, if the car is turned off after running and I try to restart the car, absolutely nothing happens when I push the button. It will not go into ACC, On or Start.

It might be, that if I exit and lock the vehicle then retry it will work fine for a while.

The battery is a few months old and is always hooked to a tender when not used, even over night.

Thanks

yardbro · 02-12-2024, 02:50 AM

Weird behavior for sure. The Start/Stop button connects directly to the CAS module via a little ribbon cable so it's essentially impossible to test its function with a wiring diagram (as far as I know).

I would start by giving it, that ribbon cable, and where it connects to the CAS a quick visual inspection before anything else. I suspect that if the button itself were to be faulty, the behavior would mimic something along the lines of what you are experiencing where you don't see any other symptoms besides when trying to start the car. If the CAS module is intermittently not responding to the start/stop button, well that's another story and hopefully you don't arrive at that.

02-11-2024, 04:27 PM	#1
MikeYQM Private First Class 80 Rep 143 Posts Drives: 2013 BMW M3 ZCP Join Date: Nov 2019 Location: Moncton NB Canada iTrader: (0)	Start/Stop Button Intermittently Unreaponsive Hi all, I have an E92 M3 and for the last few driving months, the Start/Stop button has been intermittently totally unresponsive. Typically, if the car is turned off after running and I try to restart the car, absolutely nothing happens when I push the button. It will not go into ACC, On or Start. It might be, that if I exit and lock the vehicle then retry it will work fine for a while. The battery is a few months old and is always hooked to a tender when not used, even over night. Thanks __________________ 2013 Fire Orange II E92 M3 ZCP Bimmerworld (Quad) Resonated X-Pipe, AFe Stage 2 CF Intake, Carbon Project CF Plenum, Epic Motorsports Race Tune, Rogue Engineering Power Pulleys, Continental Extreme Contact Sport
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02-12-2024, 02:50 AM	#2
yardbro Private 61 Rep 66 Posts Drives: E92 M3, E39 528i Join Date: Aug 2022 Location: New York iTrader: (0) Garage List 2008 BMW M3 E92 [5.00]	Weird behavior for sure. The Start/Stop button connects directly to the CAS module via a little ribbon cable so it's essentially impossible to test its function with a wiring diagram (as far as I know). I would start by giving it, that ribbon cable, and where it connects to the CAS a quick visual inspection before anything else. I suspect that if the button itself were to be faulty, the behavior would mimic something along the lines of what you are experiencing where you don't see any other symptoms besides when trying to start the car. If the CAS module is intermittently not responding to the start/stop button, well that's another story and hopefully you don't arrive at that.
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