heres a good one...
I have a tail light out...the running light in the hatch of my e91.
I am getting power to both tail lights.
both tail lights (left and right) are getting 8.5v or thereabouts. (seems low)
but only the DS light is working.
I have switched bulbs. no luck on the right side.
I have switched housings, same issue.
I am getting voltage at the housings!....when I plug the bulb in on the right side....nothing.
HOW CAN THIS BE? GETTING VOLTAGE AT THE PLUG, THROUGH THE HOUSING FIXTURE, AT THE PLUG RECEPTACLE.
WHY IS MY BULB NOT WORKING????
it was intermittent for a while and would come and go. now it seems to be out for good.
I have heard that BMWs can sense overall voltage for the lighting circuit and if there is something out of place, it will tell you...is this how?....too much resistance somewhere?
should I check all the other lights for corrosion or something?
any help is much appreciated!
thanks
JP
Are they OEM bulbs?
Have you tried swapping the bulbs from each side to see if the DS side works on the PS side?
This would eliminate the bulb as the culprit.
Also, have you checked if the DS front driver light is also on when the rear DS is on?
BMW has a safety feature where you can toggle that the DS front/rear driving lights will stay on forever when parked (used for being more visible when parking on dark/narrow streets).
So, have you checked if both rear driving lights are on when the engine is running?
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Finally, it is still out when the engine is running... I’d check the relays, as well as the alternator.
Eliminate these culprits as they both can cause wacky issues like this.
I had the same issue, changed the bulb and nothing, I had to replace the whole lense and it worked for me, I got the lense thru internet and paid around $65.00.
Footwell module?
I saw on the other forum you posted that you resolved this issue... It would be nice if you updated this thread too, for sake of future reference when others face the same problem. Just saying.
Voltage is low. Should be over 12 volts, 13 when running. This is the lights on the hatch, correct? So the wires run in a loom passing from the door to the body. The wires in that loom near the hinge get frayed and eventually break.
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