BMW X5 E53 DIY OEM Hitch Installation Notes and factory installation PDF

[Effduration]

Put it back to original. test the plug in the car.

-I suggest you connect the wiring as it was stock from the factory
-remove the hopkins controller
-make sure the OEM trailer module is installed near the battery cover and its wiring is stock

using a test light at the vehicle-side plug in the car, test the various functions.

If they don't work, you have a problem up the line (you have already tried 2 modules)

If they do work (and they should), you have a pblm with the harness between vehicle-side plug and trailer plug.

[omgwtf]

Originally Posted by Effduration

Put it back to original. test the plug in the car.

-I suggest you connect the wiring as it was stock from the factory
-remove the hopkins controller
-make sure the OEM trailer module is installed near the battery cover and its wiring is stock

using a test light at the vehicle-side plug in the car, test the various functions.

If they don't work, you have a problem up the line (you have already tried 2 modules)

If they do work (and they should), you have a pblm with the harness between vehicle-side plug and trailer plug.

The images with my X5 and incandescent trailer, was with the OEM connected nothing else. And only mounted in the stock position/location.

(Only thing I made was the trailer plug to trailer connector. used OEM plug and pins that connect to vehicle plug, and used thicker wires.)

I had tested the Vehicle side plug wires with a voltmeter, I can read the bulb check pulsing on the voltmeter, but no turn/brake solid signal when initiated.

I will swap back the 3 pink terminals to the OEM setup, use a test light instead of the voltmeter. To verify I have a signal other than the pulses.
And post what I can back on this forum.

[omgwtf]

Here is the test.