Headlight bulbs not working

[cfc123]

Hello guys,
Just replaced the headlight bulbs on my 2009 clc 200 cdi. I’ve put in H7 led lights, they flash a few times then don’t come on. Any ideas with what’s going on would be much appreciated, many thanks

 

[EmilysDad]

what if you put new filament H7's back in? I'm guessing that the electronics can't see enough current draw.

Replacement leds in a headlight not originally designed for them is a whole new/different debate

 

[AndySlade]

Just exactly did you replace and with what? Are the original figments LED lights? Are the new one CANBUS complian? If you originally had H7 Quartz-Halogen, replace them with Osram Nite-Eaters or the Phillips equivalent. Assuming you can fit LED lights make sure they are CANBUS compliant. My guess with the age of the car they are likely to be Quartz-Halogen originally. What @EmilysDad said is very true and another whole can of worms, especially the legality of fitting such after-market lights, where they were not originally fitted as standard.