Rear view mirror power

Jpup · 08-05-2018, 08:40 PM

So I just hardwired my radar using a mirror tap to the rain sensor behind my rear view mirror. My base model 2015 M235i only had the rain sensor to tap into, no autodimming or any other connectors. Does anyone know if the rain sensor harness loses power after the car is shut down? Maybe after a certain amount of time?

I just parked the car and went into a store for about 5 minutes and when I came back, my radar was still turned on. I don’t want this to end up killing my battery so any insight would be great.

MarcoZandrini · 08-06-2018, 07:25 AM

These cars take a while, usually 15 minutes to go to sleep. Shut down the engine, lock up the car and wait 20 minutes. Check the detector then.

BEM-S4 · 08-06-2018, 09:44 AM

My m235 I went mirror harness and it's off right away. X5 did rain sensor and that's like 15 mins. Both shut down fine - eventually.

Jpup · 08-06-2018, 10:23 AM

Can confirm, after waiting about 10-15 minutes the radar did shut off. Thanks for the help everyone.

MarcoZandrini · 08-08-2018, 01:31 PM

Quote:

Originally Posted by Jpup

Can confirm, after waiting about 10-15 minutes the radar did shut off. Thanks for the help everyone.

You're welcome.

BJM2018 · 08-26-2018, 02:28 PM

Having an issue with 18 M2. Just did a wire tap for my RD into the rain sensor (top small connector) and after turning off the car, then pressing on/off to kill radio etc, my RD still gets power for over 12 minutes plus, any suggestions?

Jpup · 08-26-2018, 02:52 PM

Quote:

Originally Posted by BJM2018

Having an issue with 18 M2. Just did a wire tap for my RD into the rain sensor (top small connector) and after turning off the car, then pressing on/off to kill radio etc, my RD still gets power for over 12 minutes plus, any suggestions?

I'm not sure if anything has changed from 2015 to 2018, but I found if you don't remove the key from the car it won't switch off. What I did to test was park at home, roll down drivers window, shut car completely off and go inside to put the key away. I came back to check and after about 5 minutes and the radar was shut off. If you the radar isn't shutting off after you've moved the key far enough away then something has changed or is different.

BJM2018 · 08-27-2018, 09:58 AM

Thanks. Car is in the garage and key is nowhere near it....It does power off eventually, but mine takes close to 13 minutes...

08-05-2018, 08:40 PM	#1
Jpup Private 26 Rep 63 Posts Drives: 2015 435i Join Date: Apr 2018 Location: Ventura, CA iTrader: (0)	Rear view mirror power So I just hardwired my radar using a mirror tap to the rain sensor behind my rear view mirror. My base model 2015 M235i only had the rain sensor to tap into, no autodimming or any other connectors. Does anyone know if the rain sensor harness loses power after the car is shut down? Maybe after a certain amount of time? I just parked the car and went into a store for about 5 minutes and when I came back, my radar was still turned on. I don’t want this to end up killing my battery so any insight would be great. __________________ 2015 435i (current): VRSF Catless Downpipe, Bootmod3 Stage 1, xHP 2008 Corvette (sold):Vortech supercharger, ported/built heads, catless 2015 M235i (sold): CTS Turbo Intake, VRSF Catless Downpipe, CSF FMIC, MPE, xHP, Bootmod3 Stage 2 E30
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08-06-2018, 07:25 AM	#2
MarcoZandrini Major 444 Rep 1,262 Posts Drives: 2018 M240i Join Date: Jun 2017 Location: Virginia iTrader: (0)	These cars take a while, usually 15 minutes to go to sleep. Shut down the engine, lock up the car and wait 20 minutes. Check the detector then.
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08-06-2018, 09:44 AM	#3
BEM-S4 Major General 4515 Rep 8,942 Posts Drives: Dinan M235, Dinan Sport Wagon Join Date: Oct 2012 Location: Philadelphia iTrader: (5)	My m235 I went mirror harness and it's off right away. X5 did rain sensor and that's like 15 mins. Both shut down fine - eventually. __________________ 2022 Macan S 2016 F31 328i xDrive Sport Wagon 2006 E46 330ci ZHP Convertible
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08-06-2018, 10:23 AM	#4
Jpup Private 26 Rep 63 Posts Drives: 2015 435i Join Date: Apr 2018 Location: Ventura, CA iTrader: (0)	Can confirm, after waiting about 10-15 minutes the radar did shut off. Thanks for the help everyone. __________________ 2015 435i (current): VRSF Catless Downpipe, Bootmod3 Stage 1, xHP 2008 Corvette (sold):Vortech supercharger, ported/built heads, catless 2015 M235i (sold): CTS Turbo Intake, VRSF Catless Downpipe, CSF FMIC, MPE, xHP, Bootmod3 Stage 2 E30
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08-26-2018, 02:28 PM	#6
BJM2018 Private 18 Rep 93 Posts Drives: 2018 M2 DCT Join Date: Jul 2018 Location: Vancouver iTrader: (0)	Having an issue with 18 M2. Just did a wire tap for my RD into the rain sensor (top small connector) and after turning off the car, then pressing on/off to kill radio etc, my RD still gets power for over 12 minutes plus, any suggestions?
	Appreciate 0 Quote

08-27-2018, 09:58 AM	#8
BJM2018 Private 18 Rep 93 Posts Drives: 2018 M2 DCT Join Date: Jul 2018 Location: Vancouver iTrader: (0)	Thanks. Car is in the garage and key is nowhere near it....It does power off eventually, but mine takes close to 13 minutes...
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