Dip beam headlight out

[hibou000]

I have a Lexus RX300 2WD 2000 yr and my offside dip beam has suddenly failed, fuse is fine and have swapped bulbs over and bulb also good, I am at a loss where to go from here..............any help gratefully received. Rog

[ColinBarber]

If the fuse is ok (there should be one for the left and right low beam) then it is probably the relay. Not 100% sure but I believe there is a separate relay for left and right low beams - I imagine they are the same part so you can swap them to verify.

[sorcerer]

Presumably you put the offside bulb in the nearside connector to try it and it worked. Did you also put the nearside bulb (known to be good) in the offside connector to see if it worked, or did you not bother and just relied on seeing the suspect bulb light up in the nearside connector?

If both bulbs are good, and the fuse for the offside is also good, make sure connections are clean and tight. If it still doesn't work then you have a break in the wiring somewhere and you'll have to start tracing the route back from lamp to switch to fuse to see where it is. Time to buy a multimeter if you haven't already got one.

EDIT: Doh, I forgot about the relays - well done Colin  

[hibou000]

bulbs both fine, both 15 Amp fuses good,there is only one relay for lights, light green in colour. Is it conceivable that part of it has failed as I find it hard to believe that there is a fault in the wiring loom............... Rog PS Many thanks for help so far!

 

[sorcerer]

50 minutes ago, hibou000 said:

Bulbs both fine, both 15 Amp fuses good,there is only one relay for lights, light green in colour. Is it conceivable that part of it has failed as I find it hard to believe that there is a fault in the wiring loom............... Rog PS Many thanks for help so far!

That it indeed a possibility, the relay may have burnt or pitted contacts on one side. Make sure the earth connection is clean and tight and if that's not it, then you really need a multimeter to measure the presence (or otherwise) and values of voltages at the various connectors.