e70 auto liftgate problem

[atreidy]

Originally Posted by Crash513

In 2011 BMW issued a service bulletin for liftgate operation problems due to damaged wiring. Ask your dealer to check SIB 51-26-10.

Unfortunately this probably won't change the prognosis, but it might help you figure out where to look. If you can trace the wiring to wherever it's damaged, you might get away with splicing it and not having to replace the harness.

Thanks for this information - really appreciate it.

Any idea which wire colors belong to the liftgate?

[Davidf]

I looked at my X5 liftgate yesterday and it has the typical wiring in rubber boot between body and liftgate (or body and trunk lid on sedans). You will need to disconnect all the wiring in the liftgate and pull the wiring harness out of the rubber boot far enough to inspect/repair the wiring. The problem will then be obvious and most likely right where the wiring enters the rubber boot from the body. Simply splice the wires back together and then, this is the important part, attempt to reposition the portion of the wiring harness that receives the most flexing upon reassembly. Either more of the wiring toward the liftgate or more toward the body. The important part here is to change where the wiring is flexed each time the liftgate is opened/closed.