There is a micro switch in the trunk lock actuator that work as trunk light switch and at the same time trunk open warning sensor . my e60 same problem was related that micro switch due its arm maladjusted and that flexible metal arm was crooked by unknown reason. i turned it back to the original location as proper point and now it turn on
The software fix is an i level upgrade which is supposed to fix 95% of cars, unfortunately not in my case so a new headunit has been fitted under warranty, while this issue still exists its a good idea to keep the car under warranty as a new unit is £1,500 + vat + fitting & coding. So the total cost is well over £2K. Nobody seems to have an answer as to what causes the problem. The answer is always to replace the CCC. I tried having my CCC software updated at a local indy shop with no success. Was quoted $1700 parts and labor for a new one. Bought a used one from an 08 M5 online, and will try to swap it out. 3) For your 2004-up BMW 7 series you can use our universal module (cut 3 wires) or our plug and play unit part number BMW-7. 4) The 2004-up BMW 5 (E60) and 6 series (E63, E64) come in plug and play only and use a new digital RGB unit. The BMW 5 and 6 series part number is BMW56. You will need an additional DVD player, back-up camera or PS2/XBOX YSx5iXb.