The fog lights and high-beams work well. A Chevy mechanic has suggested 1) The wires on the fuse box have been damaged and 2) The relay should be replaced 3) This will cost $274. Please advise if this is good idea. Thank you.
low beam wont work but all the others will. Please help
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P lights and fogs are fused separately to h lights. Go to the fuse box. Next the high low relays, then the column switch, but have a test lamp ready to test for a supply at the actual headlamp because if there is power to the lamp but no light, check the ground wires from the headlight unit are tight and on clean bare metal
First of all are your headlights a double filament type headlight? If yes then I would suspect that a power wire to the high beams is broken or shorted. If your high beams are a separate set of lights from your regulars running lights then either the high beams headlights are missing. or has a broken power wire or shorted or...You could check the fuse box under your dash and under the hood of the car to see if you have a fuse for the high beam lights.
Could your Mazda have daytime running lights? If you checked all fuses, did that include the three in the joint box?
There is an auto light-off control module that is central to all functions you describe. It is assumed that you would only turn on the fog lights with headlights on and set for high beam. If you set the headlight switch to LOW, the module closes the headlight relay to turn on the low beams. If you then turn the headlight switch to HIGH, the module turns on the high beams and allows you to turn on the FOG LIGHT switch, closing the fog light relay and turning on the fog lights. Since this sequence is not working, I suggest checking both high beam lamps as both could be burned out. Other possibilities are a defective headlight switch or the module
If high beams work and low beams do not, then it is probably the high/low relay. It is part number 15016745 and has four prongs. To test if your relay
has gone bad locate the relay in your fuse box. There will be two of these
relays located next to each other. One controls the low beam headlights
and the other the cooling fan. Swap the relays and check your low beam
headlights. If the low beams work you have a bad relay.