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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > F30 DIYs and Coding Discussions > Turn on tail light on trailer with DRL
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      08-01-2015, 01:49 PM   #1
Jojje
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Turn on tail light on trailer with DRL

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I've just coded this to my car:



Which works fine, the tail light on the car is enable in DRL-mode, but my trailers tail light is still off.

Is it also possible to enable the trailers tail light when in DRL-mode?

Last edited by Jojje; 10-15-2016 at 06:13 PM.
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      10-15-2016, 06:16 PM   #2
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Anyone?
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      10-16-2016, 03:28 AM   #3
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Maybe you've got the trailer wiring going to the wrong signal wire on the vehicles harness.. Before you coded the car, did the trailer lights work correctly when the headlights are on?

i.e... When you're on the brakes the lights go bright on the trailer, and when you're off the brakes the trailer lights go dim, and off when the lights were off?

What that coding should've done was turn the tail lights on when the DRL's are on.. Which your trailer wiring doesn't care about.. if the signal wire has 12vdc.. it turns on the lights.. if it doesn't see 12vdc.. the lights are off.

----------------------------------------

When I installed a trailer wiring harness on my car, contrary to the posted instructions online I had chosen the wrong signal wire for the brake circuit.

So anytime the headlights were OFF (DRL only) and you hit the brake the lights would go to full bright, and the turn signals worked as advertised.

But, when the headlights were ON, the trailer defaulted to full bright, with no working signals. I figured out that I had the signal wire for the brake circuit looking at the taillight combined ground, not the power lead for the brake lights.

Last edited by zibbit; 10-16-2016 at 03:48 AM.
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      10-16-2016, 01:52 PM   #4
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Yes, before I coded the car, the trailer light work correctly when the headlight are on. And with headlights off, both the car and trailer tail light was off, as expected.

Now everything is the same as before, except that the car tail light are on/dim even with headlight off. Exactly what I've coded.

The problem is that my trailer doesn't understand to get tail light on/dim even when headlight are off. As the car can do now after coding.
The turn signals and brighter tail light on trailer and car works fine.

I've tested at least two trailers and both had standard untouched wiring
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