Originally Posted by Thermo

Arvid, open up the hood/bonnet and look down behind the battery. You should be looking at the top of the transmission. Sticking out the top of the tranny will be 2 wires connected to a sensor. This is the reverse light switch. Disconnect the connector going to the switch and using a paperclip, stick it into the two openings in the connector. Do you reverse lights come on? If yes, you just proved that the switch is bad. Replace. If not, then some more troubleshooting will be required. It could be an issue between the fuse box and the switch or with the wiring between the switch and the rear of the car. This is where checking for 12 VDC on the paperclip will tell you which end of the car you are looking at having to troubleshoot. If you find 12 VDC on the paperclip, then the problem is in the rear of the car. No 12 VDC, it is between the connector and the engine bay fuse box. If you need to narrow things down more than that, let me know and I will tell you what needs to happen.