Well it seems I went over a speed bump last night and lost my headlights? I also noticed the brake lights are also not working? Is this result from the headlight switch going bad? Thanks

 

i'd check the fuse(s) too.

 

do the headlights flip up still? dash light work?

 

Headlights pop up and I have running lights.

 

I checked the fuses under the drivers side dash and the relays in the engine bay.

 

Locate the Headlight Relay and jumper the White/Blue wire to ground and see if the headlights turn on. And is this an S4 or S5?

 

S5. Pics of relay?

 

It's located in front of the radiator and to the side along w/other relays. It's the only one w/the White/Blue wire.

Edit: The Stoplight fuse needs to be good. If it is then the G/W wire at the Stoplight Switch on the brake pedal will have constant voltage (no key). If this wire has constant voltage then w/the brake pedal depressed the Green wire in the same switch (only has two wires to it) should also have voltage on it. If it does then the voltage runs to the brake lights to activate them.

And the brake lights are independent of the headlight operation.

 

Would the headlight relay resolve the brake light issue?

 

"And the brake lights are independent of the headlight operation."

 

no, the brake lights just have the fuse.

 

I checked the fuses and all seem fine? It's weird that hitting that speed bump would cause all of this.

 

You're not going to remedy this situation by just focusing on the fuses alone. You've been given enough info to narrow down your problem, the rest is incumbent upon yourself.

 

Thank you. I have pulled up the fsm and working on it.

 

The Headlight Relay and the Dimmer Relay are side by side and perhaps along w/other relays. It should be easy to find. The Headlight Relay has but four wires and two are Red, and one is White/Blue and the fourth wire. You should focus on the W/L wire as grounding this wire should cause the lights to turn on as long as the relay is working properly and the Red wires have constant voltage (fed by the Head fuse).

If the relay is working and the W/L wire being grounded does not cause the lights to turn on then perhaps the filaments in the bulb were broken. Each bulb should have three wires. One is the ground and the other two wires each powers one of the filaments, low beam and high beam. If these wires are supplied w/voltage one at a time from lets say the battery, the light should turn on. If neither wire turns on the light then you know the filaments are shot.

R/W is the high beam wire at the headlight bulb and R/B is the low beam wire. And as far as the Headlight Relay is concerned, when the W/L wire is grounded the Red/Green wire should have voltage. If both Red wires have constant voltage and the W/L wire is grounded and the Red/Green wire does not have voltage then the relay is no good.

 

Thank you, I will work on it and post my findings. Hopefully it will help someone in the future.

 

Is there a ground that the brake and headlights share? I'm replacing the headlight relay tomorrow. I'm trying to trace everything and make sure I dont miss anything. Thanks

 

Did you test the relay? Grounding the W/L wire should turn the lights on. Does it? Do both of the Red wires have constant voltage? Does the Red/Green wire have voltage w/the lights turned to the on position? And both headlights share a common ground.

 

I did not have a voltmeter. I did ground the relay to no avail. I'm picking up a tester in the morning. I pulled both relays up front and noticed they where somewhat rusty and had white crust on them. One relay is black and the other was on a blue connector. I also noticed the white crust on the brake fuse inside. I have a buddy bringing me his relay to test my car with. I'm still at a loss being that it was a speed bump that caused all of this.

 

Yes there was power to the red wires.

 

Your filaments might be damaged but that would be easy to check.

 

doubtful that all 4 filaments burned out at the same time.

my TII developed the same issue but i haven't had time to check it, exception is my headlights don't flip up so i'm betting my problem is the headlight switch or power feed to the switch where yours sounds like a relay issue. mine are HID low beams also, but no power is showing up at either hi or low beams. not very difficult to pull a headlight out and check the 2 power feed wires, it may be a grounding issue within your front harness, in which case you can just cut the ground wires and bolt them with a ring terminal below the headlight buckets to the chassis.

i have had one car in which the harness junction for the headlights had seriously corroded and had to dissect it to repair the problem. had to cut out the crimp and solder the junction and shrink wrap it back up, mazda's crimp junctions are a joke.

 

He hit a speed bump, probably at a fairly high rate of speed, and this is when his problem occured.

And to the original poster. If the Red wires at the relay have voltage and the White/Blue wire is grounded then the Red/Green wire must have voltage. If it does then your problem lies after the relay, which narrows it down to the Dimmer Relay, headlights or the ground to the headlights.

 

yeah but the high beams are rarely used so at least those should still be functioning. their filament is much more durable than the thinner/longer stranded low beams.

 

I have traced it to the headlight relay. I am trying to source one now. The brake lights ended up being a fuse issue. I bought dielectric grease and applied it. Thank you very much guys!!