Headlights don’t turn on and cluster lights don’t either. I can turn my low beam and highbeam on nothing happens except my tail lights turn on I can do my turn signals and hazards fine also hear the beeping that the lights are on when the keys aren’t in when I turn on the lights. Changed relays for dimmer and headlight nothing happened look at headlight switch wiring harness nothing is burned and switch seems to be fine

 

possible bad solder joints inside the switch assembly.

 

Last year I started working on getting all of my stuff working again, and had this same issue. I opened up all of those controls and reflowed all the solder joints, both heat and dabbed a bit of new solder on each one. Lights, turn signal, windshield wipers, and cruse control boxes all redone. I also took the computer that sits left of the drivers feet, and took that out, and those three control boards as well, as that is what controls the turn signal relays, etc. I removed the one resistor to get rid of the hyper flash "dead bulb" function, as my entire car has been converted to LED bulbs and then all the stuff that controls the horn. Went from a weak wheeze to a very solid horn after doing that too. Just go slow with taking them apart, as there is lots of little screws and plastic tabs that are old and brittle.

If you do decide to convert to LEDs, I do recommend using real amber and red LED bulbs in those spots, as using white, it makes the red look pink because of how bright they are, and the amber looks washed out. If you put LEDs in the dash cluster, be aware that LED bulbs are +/- directional, so you might need to test and make sure they turn on properly. I did put a regular bulb in the highbeam slot though, as using an LED in there made it really bright, and it does not dim with the other bulbs, so having a super bright blue thing in your face in the middle of the night was not good.

 

That's funny as hell because I made the same mistake when I redid my wife's cr-v. Went all led and she let me know one day that the high beam indicator was retina searing.

 

I just got done installing a megasquirt 3 ECU, so I had an empty shift light from the stock ECU fuel nanny, so it got the bright LED for the MS's customizable shift light, and the high beam indicator got the regular bulb, so it is a nice blue glow rather then the searing blue light I could read by if my eyes had not burnt out

 

Got a new switch Highbeam works and interior gauges cluster lights and everything works but the highbeam are practically stuck low beam doesn’t work just highbeam.

 

Yep, the relays that are switching on and off is still the CPU unit near your left leg. I took those out and reflowed all the solder joints

 

mine RHD S5 i’m guessing the CPU that you’re talking is the one that is the horn/flasher one that’s black.

 

Right, is a black plastic case, with three things that plug into it. There are three boards in there, one controls the flashers (I removed the resistor that causes the hyperflash because I converted everything to LED, I might go back in there later and add a pot so I can adjust the speed that they flash) and the high/low beam lights. When the lights are off, using the highbeam just flashes the flash to pass lights though the front lenses, while when they are up, toggle between high and low. Several of those solder joints had cracked, so I just went in and reflowed all of those, and fixed all of those weird issues.

Just because the age of these plastic parts, just use a small flat screwdriver to pry them apart after you take any screws out, cause the brittleness of the plastic.

 

Don’t have a 3rd board just have 2 the horn and flasher one the flasher one is missing 2 things on the board not sure if its like that stock or not doesn’t look like it is.

 

Re flow EVERY solder joint on the back. Can't hurt to clean the contacts on the relays. Slip a piece of 1500-2000 grit paper in between them til they are shiny.

 

That is the one, I had two of those CPU boxes, and one of them also was missing the same one, so might have been an option, like cruse control or such. But yeah, just reflow all those joints.

On the 2nd image, the one marked R1 is the resistor that causes hyperflash if you switch to LED bulbs, you can flat out remove. I am thinking of re-adding a pot to it to tune its flash speed in the future, and mod the case so I have an external **** or something.

Note that this video is for the FD, but the board is identical, I think Mazda decided to not change something if it worked just fine.

 

[QUOTE=Malic;12502126]That is the one, I had two of those CPU boxes, and one of them also was missing the same one, so might have been an option, like cruse control or such. But yeah, just reflow all those joints.

On the 2nd image, the one marked R1 is the resistor that causes hyperflash if you switch to LED bulbs, you can flat out remove. I am thinking of re-adding a pot to it to tune its flash speed in the future, and mod the case so I have an external **** or something.

So I got all the lights to turn on and now if i put the car on low-beam it just stays stuck on high-beam could that be the relay its the blue 5pin doesn’t click anytime i switch on the headlights i know that’s the dimmer relay so i’m guessing that’s broken or my turn signal/high-beam switch is broken.

 

due to the age of all the parts, I have a feeling that the solder joints in the turn signal switch are also bad and need to be reflowed as well. I took out all four control boxes (lights, turnsignal, cruse control, windshield wipers) and all of them had cracked solder.

Just have to take them apart, so go slow and take pictures so you can put them back together