I have changed s40 treg headlights from single to twin ie t4 but am unable to get power to main beam bulbs ,both main beam bulbs work if wire is connected to another power source , but when wire is connected to terminal block i get blue dashboard indication to confirm main is on but main beam bulbs do not come on , is there a relay between steering column stalk and headlight terminal block ? ps all fuses ok in car and under bonnet
SOURCE: lowbeam headlight not working
I went to the dealer, the parts for this are back ordered... must be a common problem.
The terminal clips weaken over time, then fail. They need to be replaced, if you go the the Volvo dealer and ask they may help you out. Failing that, you could contact Volvo directly and ask them. They may make good for you. If nobody will help you, maybe the NHSTA should know about this saftey defect...
SOURCE: Volvo S40 Low beam headlight
Sounds like a wire to me. It's definitely not fuses (unless the fuses have been split for left and right hand side which I have never come across, but we are talking about volvo lol) so I'd say most likely there'd be a break somewhere in the harness. The driver's side probably blew as all the power gets sent to one side when one bulb isn't working - so it's working twice as hard usually - making it more susceptable to blowing.
SOURCE: Headlight failure
look in the o/m for a relay in the fuse panel that controls the headlights it's not a fuse its a little silver box about the size of the search box on this page sometimes these will go bad and cause the headlights to cycle
SOURCE: Low beams are not working, high beams do.
FIRST THE HEADLIGHT SWITCH??? AND CHECK THETURN SIGNAL MECH
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