Question about Renault R18
If both lights do not work it is unlikely to be a fuse or even the bulbs, although that cannot be completely discounted. The more probable cause would be the headlight relay which has gone faulty or even the headlight switch which is not selecting the low beams. Fuses are easiest to check, and there is probably one for each light. Bulbs are a bit trickier and really need a continuity tester to check, or try other bulbs. (Remember not to touch the glass part of the bulb). The relay can only be checkec by replacement and the switch can be checked by seeing if there is power at the low beam terminals when the switch is selected that way.
Posted on Apr 08, 2011
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Posted on Jan 02, 2017
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The headlamp circuit is rather simple. From the 15 amp RH headlamp fuse, there is a red w/yellow trace that goes to the RH high beam. Out of the 15 amp LH headlamp fuse, the wire going to the LH Hi beam is solid red. Both of these wires should have power when the headlamp relay is energized. The wires from the Hi Beam bulbs going back to the switch should both be red w/black trace. The wire going from the headlamp relay to power the 2 15 amp fuses is white. The headlamp switch applies a ground to illuminate either the Lo Beams or the Hi Beams.
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