Third Taillight on rear deck M3 or 325iS

[Triodeotl]

Third brake light is not lighting up (on the rear deck) although the brake lights do along with the third light in the spoiler on a 94 325is M-TECHNIC.

Does anyone know why this might be happening? It is not the light bulb or the socket. I tried both and it does not seem to make any difference. When the igintion key is set to accessory there is no curent going to the third deck light with a light bulb check. Does the car have to be started to light up the third deck light?

Does anyone know what might be the cause?

Thank you,

Rick

[parolof]

sounds like a wire has been cut somewhere, according to the ETM diagram the raised brake light shares the same ground distribution point and live point as the regular brake lights

[Triodeotl]

No wires have been cut. I checked the socket with the bulb out with the brake lights on. I used a test bulb with two wires and that still does not work.

Any other ideas?

Thank you,

Rick

[crashthecar]

It might be a factory thing, has the light ever worked?
When a spoiler is fitted most manufactures delete the high level stop light.
I Queensland it is actually illeagal to have any more than 3 brake lights one on each side and a higher central light.

Just an idea.
Luke.