The problem here is most likely a cracked wire going in to the boot lid.
Bmw e90 number plate lights not working.
Finally they have arrived and i installed them in under 2 minutes myself.
Each of the rear number plate lights have a separate feed for power believe it or not.
On the off side unit no bulbs are working for side reverse or fog.
Similar for the e46 e39.
I waited almost 3 months for these to ship from taiwan.
They are cheap i got them for 15 usd and a great small mod to.
A common problem on lots of generations of bmw models is the phenomenon of cracked wires in the loom.
Posted on nov 28 2008.
Both number plate lights work.
Take the bulb back out and clean inside the bulb holder there may be some corrosion or other debris in there.
There is a cable harness that runs from the main body to the bootlid.
The near side unit left hand side light and fog light work ok but no reverse light.
E90 e60 reverse lights or number plate lights not working.
You can see this on the right hand side of the car it will look like a black rubber concertina d tube.