Thread: D4 Electric Trailer Brake Wiring

Originally Posted by Crofty

Does my sketch look good fellas?

Looks right to me.

Scott

Originally Posted by LRD414

Looks right to me.



Scott

Cheers Scott, all in. Just needs testing tomorrow.

Whipped together a drawing for any others to follow on the redarc tow pro elite install for a MY15 LR4.

Todays effort. Relocated this from the steering column to accommodate llams.
Really like this spot as it looked pretty bare missing a factory option.

Must admit it was fun getting that light in behind that circuit board.. Looks alright though.

Need some help to work this out. Just bought a 2013 D4 with a Teknosha P2 and had to correct the wiring by adding a diode and getting the right outputs to the main 7 pin plug. But I now have a situation where the brake controller over ride works as expected, however putting the foot on the brake pedal gives no voltage from the BCM. Reset the car and no van connection and it works as expected. Connect the van & no go from the brake pedal.
I've checked with the IID tool & there's no faults.
Anyone got any ideas?
I'm thinking the diode isn't playing the game (yes it's installed the right way). All the wiring is done under the tail light, not inside.
Tomorrow I'll check the wiring inside the car.
Any ideas from the brains trust?

The P3 has some diagnostics that might help. One thing to watch out for is that the output is proportional to the braking inertia, so is much lower than you might expected when stationary and also depends on whether B1,B2 or B3 setting is applied.

The link below is a recording on my measurements a few years ago.
You can read the voltage from the brake pedal being applied via the diode and also the current and voltage out to the van via these diagnostics.


http://www.aulro.com/afvb/d3-d4-rrs/...ml#post1419157

Regards
Gerry

Originally Posted by disco4now

The P3 has some diagnostics that might help. One thing to watch out for is that the output is proportional to the braking inertia, so is much lower than you might expected when stationary and also depends on whether B1,B2 or B3 setting is applied.

The link below is a recording on my measurements a few years ago.
You can read the voltage from the brake pedal being applied via the diode and also the current and voltage out to the van via these diagnostics.


http://www.aulro.com/afvb/d3-d4-rrs/...ml#post1419157

Regards
Gerry

Thanks Garry, much appreciated. I've realised that it's a P2, not a P3 so I corrected the post above.