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Although not usual but I have seen both headlamp bulbs to be blown at the same time. That should be fairly easy to check. But to answer your question the relays (both hi and lo beam) are located in the Underhood fuse/relay box located at the right rear of the engine compartment. Also check fuses # 3 and 5. They are 10 amp fuses and are for the high beams .You did not specify the submodel and this information is for the Ridgeline RT. There are 4 submodels of the Ridgeline. So this is assuming all submodels are the same as far as the high beam headlamps are concerned. I do know they are the same with or without DRL (daytime running lamps) on the RT but cannot guarantee they are for the other three submodels. (most likely they are if i had to say)
The bulbs have 2 filaments, one for low beam and one for high beam. It's possible both high beam filaments are blown and you just need to replace the bulbs. You can check by measuring the voltage at the high beam terminal. You should see at least 12 volts when you turn on the high beams. If you do, it's the bulbs. If you don't it's likely the switch or the relay (assuming you've verified the fuses are good)
if the fuses are good then you need to check for power and ground at the headlight plug that attaches to the headlight bulb if you have a good power and ground there and the connections are good then the bulbs are both no good.or if you can tell the bulbs are burnt out by looking at them then you don`t have to check powers and grounds.you also can directly feed power and ground to the bulb and check both the terminals for high beam and low beam as you cannot tell which is which by looking at the terminals
I would start by checking the bulbs, if the bulb goes bad you can still have high beams, so start by checking the bulb and the fuses if they dont light up after replacing the bulbs , hope this is helpful,
You have 1 high beam relay and a lo beam relay located under the hood. You also have 4 fuses under the hood, 2 are for high beam 10 amp and 2 for the low beam 1 is a 20 amp and the other is a 15 amp fuse. Remove the top off the fuse/relay power distribution center and look inside the top. It will tell you the location for each fuse and relay. hope this will help you.
u should start by checking the bulbs, sometimes it is hard to tell your low beam bulbs are bad until they are both out, if they are both good try wiggling the headlight dimmer switch between high and low beam functions to see if the switch is just worn out. if neither of these presents the problem then u may have an electrical issue that should be diagnosed by a technician