Cayenne TT Driver side HID headlight Low Beam not working

[kbendon]

I have read through posts for weeks on this and have tried everything. Low beam still not working.  I can hear the level motor but the light doesn't come on

 

I have switched ballasts=same result

I have switched d1s light = same result

Have replaced with NEW d1s bulbs= same result

I have replaced the harness behind the headlight=same result

I have taken the whole unit out and plugged into the passenger side and the complete light worked

I have check the low beam fuses=fine

both turning lamps do not work but haven't changed bulbs yet

 

What else could it be?

 

Thanks for any help

[Loren]

:welcome:

 

There is a front end electrical control module that controls all of the lights. You may need to get it re-programmed.

It is not unusual for these control modules to lose some or all of their memory/programming during a battery change or other electrical anomalies.

In most cases a simple reprogramming using a Porsche diagnostic tool (PIWIS) will correct the problem(s).

[kbendon]

Even if the brights work on that side?

[Loren]

Yes.

[kbendon]

Then why would the complete light work when plugged into the passenger side and vice versa the passenger side Headlight has the same effects (only high beam works ) when plugged into drivers side?  make sense? sorry so many questions

[Loren]

Okay - so the headlight works you proved that by swapping with the opposite site.

You changed out the wiring harness - so that should be good.

What you have not done is re-programmed the computer module that turns each of those lights on - individually.

 

Unless there is another break the wiring then it is likely a control module issue.