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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sat, Dec-14-2019, 01:23:55 AM   #1
Geoby0
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Default Lights staying on

Wanted to see if anyone’s experienced something like this before I dig into my trunk wiring sleeve to check for worn wires

Randomly after my rear suspension work was completed, my electrics started acting funny.

Corner lights and indicators turn on immediately with lights. I drove it and got a brake light failure message on obc. Later my right turn signal completely stops indicating- I turn the stalk up and no clicking, no flashing . I don’t think my column is going bad- maybe I messed with a ground on the body while working on rear? Fuses seemed fine. Bulbs just replaced.

If anybody is familiar let me know!


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Old Sat, Dec-14-2019, 04:02:40 PM   #2
Richardsperry
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Default Re: Lights staying on

The old Post hoc ergo propter hoc...

Rear suspension work didn't cause this...

Things to check.

Fuses seem fine? They either are, or they aren't check them with a meter.

Did you replace the bulbs with the correct bulbs? Yes there are different bulbs that you can force fit, and they won't work. Check to see if the actual tail light contacts are clean or check for corrosion.

Check the flasher relay.

Was it a "brake light" failure message or a "Circuit" failure. One is usually a light, the other is the actual brake like switch...

Invest in at least a Bentley manual. You really can't work without an actual wiring diagram.
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Old Wed, Dec-18-2019, 02:21:55 PM   #3
bluptgm3
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Default Lights staying on

What is the health of your battery?
How old is it?
Dry cells, add distilled water and charge.


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Old Wed, Dec-18-2019, 05:00:51 PM   #4
egebhardt
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Default Re: Lights staying on

I'm guessing you opened and closed the trunk a lot when replacing the rear shocks.

The tail lights have an antiquated circuit board on the back of them. You might find a combination of breakage on that zinc-plated steel board and the trunk wire loom.

Trunk Wire Loom - pop the trunk and look around the left hinge. That black wire set probably has some breakage in there from folding 100,000 times.
ECS actually sells a replacement wire loom.
https://www.ecstuning.com/b-genuine-...t/61128391788/

Last edited by egebhardt; Wed, Dec-18-2019 at 05:05:02 PM.
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Old Wed, Dec-18-2019, 11:08:56 PM   #5
Geoby0
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Default Re: Lights staying on

Thank you all for you input!

@richardsperry I replaced the flasher relay with a spare I had and my signals came back.

Only problem left is that my all 3 of the left indicator lights come on when i turn my lights on- but the signal works and none are light when the lights are switched off

Im assuming that something related to the left side lights is bad- which is why all 3 stay on when I switch on the lights.

@bluptgm3 Battery is good- less than a year old
@egebhardt yes i did- at 210k im sure its gone through many. Checking the loom is up next
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Discussing Lights staying on in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)