Solved. $166 for my mechanic to track down a bad ground 31/72. No more message on dash. Add another $85 for the new harness.

I replaced the tail light harness with a new one and a new bulb and the condition still exists. Drivers side brake light still out. Any ideas ? In a quiet garage I can hear the relay go on and off when I step on the brake.

My apologies, having seen your post on Swedespeed and recognizing your signature (MY04), I provided an image of an incorrect wiring diagram. There are indeed some wiring and module changes that occur after MY05, my diagram what either 05 or 07. The MY04 wiring diagram on Swedespeed notes the same ...

Thanks. I agree as does my mechanic. I may get a new tail light wiring harness for about $75 or so. It seems to be the likely culprit. Or maybe a shot of WD40 or a contact cleaner although they did look pretty good.

It appears I have to replace the entire harness...

Much appreciate the help 1

Thank You ! But I'm a mechanical engineer not electrical. Can you interpret this for me ? Thanks !

Only one of three brake lights is out. Changed bulb which was OK and problems still continues. Checked fuses and all are OK. I've read any number of posts that refer to the relay (s) in the rear but my local mechanic says that would affect all three brake lights and not just one. He is suggesting ...