I would like to fix the taillights once and for all, simply.
I am pretty sure the problem is in the main lamp control unit (LCU) up there to the right of the passenger knee shelf.

I ran voltage directly into the back of the light switch and found voltage in the correct wire going into the LCU but none coming out either of the wires supplying left and right taillight/sidemarker light power.

Can I not just bypass this LCU by bridging the powered wire coming from the switch with the two going to the taillights? Can anyone offer any insight as to why(which gut feeling tells me it probably is) a bad idea?

Thank you~

 

Porken has done this with no issues.

 

Yes, a few people have bypassed, others have cleaned and re-soldered the boards inside the unit. I was sure that mine was bad because I replaced all the bulbs and still had the tail light fault message, even with the lights off.

I sourced a known good module, replaced and still had the error! This time I replaced all the bulbs with the ones from 928Intl instead of the local parts store and the warning went away and has not been back since.

 

Thanks a lot guys

 

You can certainly bypass it - But it is rarely to blame for failure of lamps to illuminate - usually just for spurious warnings - so check that first.

The best way to bypass it incidentally is to either canibalize your existing LCU or get a spare and do the bridging direct with wires soldered between the terminals. Why? - because then going back to stock is a simple as plugging in a different LCU...

I second the note to get good bulbs - some cheap auto store bulbs have widely varying actual specs - buy top quality brands preferably in multi packs together.

Alan

 

What year car?