HA! Did you know your trunk light comes on with your brake lights?

Cory S · 01-05-2017, 08:49 PM

Just noticed this the other night. I had the rear seat/trunk pass through arm rest thing down. A passenger happened to notice my trunk light was coming on and off and asked me why. I had no idea until I stepped on the brake, and the light came on. Then went out. Kind of strange to say the least why BMW would wire it in that way....

opjose · 01-05-2017, 09:02 PM

The brake light is controlled by the FRM (Footwell Module) while the trunk light is controlled by the FZD (Roof Function Center).

The lights are wired into their respected module and there is no cross connection to the brakes.

Either there is a problem with your wiring, or with your FZD module.

You may want to get it checked out.

Cory S · 01-05-2017, 09:20 PM

Quote:

Originally Posted by opjose

The brake light is controlled by the FRM (Footwell Module) while the trunk light is controlled by the FZD (Roof Function Center).

The lights are wired into their respected module and there is no cross connection to the brakes.

Either there is a problem with your wiring, or with your FZD module.

You may want to get it checked out.

interesting...The wiring is completely stock and untouched. Has anyone ever checked to see if their E90/92 does this? I did notice the other night after about 10 minutes of driving, it stopped doing it.

Maybe if you put someone in your trunk and drive away, it acts like a courtesy light for them?

STR8-6IX · 01-05-2017, 09:27 PM

highly doubt that is how they programmed it. sounds like a fault/glitch with your wiring from the factory.

Cory S · 01-05-2017, 09:32 PM

Can a few of you go check to see if it does the same thing?

Tom K. · 01-05-2017, 10:43 PM

Quote:

Originally Posted by Cory S

Can a few of you go check to see if it does the same thing?

I think I would have noticed it in my wagon over the past 6 years.

Tom

Cory S · 01-05-2017, 10:52 PM

Quote:

Originally Posted by Tom K.

I think I would have noticed it in my wagon over the past 6 years.

Tom

I don't think a wagon would qualify as having a trunk.

VTECaddict · 01-06-2017, 01:27 AM

Are your trunk panels removed? The tail lights aren't very well sealed on the inside and theres a ton of light leakage. If your side panels are removed then you would see the light from your tail/brake lights.

The light on the top of the trunk (under side of rear shelf) is not wired with the brakes. I have driven around with my seats folded down many times and it does not come on.

Captain comic · 01-06-2017, 01:57 AM

Quote:

Originally Posted by Cory S

Just noticed this the other night. I had the rear seat/trunk pass through arm rest thing down. A passenger happened to notice my trunk light was coming on and off and asked me why. I had no idea until I stepped on the brake, and the light came on. Then went out. Kind of strange to say the least why BMW would wire it in that way....

Was your passenger in the trunk and if yes, then you probably used not enough tape to cover his mouth?

Cory S · 01-06-2017, 02:06 AM

Quote:

Originally Posted by Captain comic

Was your passenger in the trunk and if yes, then you probably used not enough tape to cover HER mouth?

Fixed it for you.

1QuikWS6 · 01-06-2017, 03:45 AM

No, the trunk light does NOT come ON with the brakes

Had my back seats down many times and would have been able to see it if it came ON & it has never happened

Cory S · 01-06-2017, 03:50 AM

You know.... I do have a panel off on the side..... !!!!!!!!!!!

Volasko · 01-06-2017, 08:44 AM

Quote:

Originally Posted by Cory S

You know.... I do have a panel off on the side..... !!!!!!!!!!!

Case closed!

al8apex · 01-06-2017, 12:05 PM

duh ...

Cory S · 01-06-2017, 12:06 PM

GFYS.

Dark_Knight_335 · 01-06-2017, 01:41 PM

Find someone that's willing to climb into your trunk and take some short trips around the block to confirm.

Tom K. · 01-06-2017, 04:37 PM

Quote:

Originally Posted by Cory S

I don't think a wagon would qualify as having a trunk.

Both the wagon and sedan are described by BMW as having "Cargo Bays" which have their own automatically controlled lights.

Tom

01-05-2017, 08:49 PM	#1
Cory S Major 305 Rep 1,163 Posts Drives: 2011 335i-X Join Date: Oct 2015 Location: N.H. iTrader: (0)	HA! Did you know your trunk light comes on with your brake lights? Just noticed this the other night. I had the rear seat/trunk pass through arm rest thing down. A passenger happened to notice my trunk light was coming on and off and asked me why. I had no idea until I stepped on the brake, and the light came on. Then went out. Kind of strange to say the least why BMW would wire it in that way.... __________________ 2011 335i X-drive 6AT / Pure turbo / 500AWHP/526TQ
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01-05-2017, 09:02 PM	#2
opjose Major 242 Rep 1,354 Posts Drives: 335xi Join Date: May 2016 Location: Md iTrader: (0)	The brake light is controlled by the FRM (Footwell Module) while the trunk light is controlled by the FZD (Roof Function Center). The lights are wired into their respected module and there is no cross connection to the brakes. Either there is a problem with your wiring, or with your FZD module. You may want to get it checked out.
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01-05-2017, 09:27 PM	#4
STR8-6IX Banned 536 Rep 2,825 Posts Drives: RWD 528i N52 Join Date: Nov 2016 Location: Toronto iTrader: (0)	highly doubt that is how they programmed it. sounds like a fault/glitch with your wiring from the factory.
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01-05-2017, 09:32 PM	#5
Cory S Major 305 Rep 1,163 Posts Drives: 2011 335i-X Join Date: Oct 2015 Location: N.H. iTrader: (0)	Can a few of you go check to see if it does the same thing?
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01-06-2017, 01:27 AM	#8
VTECaddict Where'd my VTEC go? 481 Rep 6,067 Posts Drives: 06 330i 6MT Join Date: Mar 2009 Location: Seattle, WA iTrader: (4)	Are your trunk panels removed? The tail lights aren't very well sealed on the inside and theres a ton of light leakage. If your side panels are removed then you would see the light from your tail/brake lights. The light on the top of the trunk (under side of rear shelf) is not wired with the brakes. I have driven around with my seats folded down many times and it does not come on. __________________ AW/Terra \| ZSP \| ZPP \| ZCW \| iDrive \| CA Mods: BC BR coilovers \| Blacklines \| M-tech rear \| dual exhaust \| M3 steering wheel \| BMW SSK \| ZHP shift knob \| High-kick CF spoiler \| NBT Retrofit M3 front control arms \| M3 rear guide rods \| Manzo rear toe and camber links \| Monroe rear shock mounts \| Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear
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01-06-2017, 03:45 AM	#11
1QuikWS6 No 55mph 1622 Rep 8,476 Posts Drives: F32 435ix MSport Join Date: Jul 2009 Location: Blitzburgh, PA iTrader: (113) Garage List 2022 BMW M440ix Vert [0.00] 2015 BMW 435ix MSport [0.00] 2000 Pontiac Trans Am [0.00]	No, the trunk light does NOT come ON with the brakes Had my back seats down many times and would have been able to see it if it came ON & it has never happened __________________ F32 435ix//MGM//M Sport-Prem-Tech-Driver Assist-Lighting-Cold Weather-Dyn Handling Pkgs//M4 Black Lthr Int w/M4 Alum Blade Trim//HK w/Bavsound Stg3//763M//M4 Euro LCI Tails//M4 Mirrors w/CF Covers//AWCarbon CF F/R Spoilers-Side Splitters-Diffuser 6WB/ID6 HU+HUD/IND M4 Alcantara Armrest//PURE S2 Turbo//AA FMIC+DP//ER CP+TIC//3.5bar TMAP/TS DV//AWE Tuning Exh w/Blk Tips//Turner MS CF Intake//BM3 Cary Jordan Tune//MPerf Diff//PrecRW Ignition Kit
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01-06-2017, 03:50 AM	#12
Cory S Major 305 Rep 1,163 Posts Drives: 2011 335i-X Join Date: Oct 2015 Location: N.H. iTrader: (0)	You know.... I do have a panel off on the side..... !!!!!!!!!!!
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01-06-2017, 12:05 PM	#14
al8apex Private First Class 25 Rep 178 Posts Drives: 2011 E90 328i 6mt sport, 21k m Join Date: Dec 2015 Location: 85260 iTrader: (0)	duh ...
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01-06-2017, 12:06 PM	#15
Cory S Major 305 Rep 1,163 Posts Drives: 2011 335i-X Join Date: Oct 2015 Location: N.H. iTrader: (0)	GFYS.
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01-06-2017, 01:41 PM	#16
Dark_Knight_335 Came to the N55 Darkside 1112 Rep 12,740 Posts Drives: 2011 335 E93 M-Sport Join Date: May 2010 Location: NY/NJ iTrader: (28)	Find someone that's willing to climb into your trunk and take some short trips around the block to confirm.
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