I've got an odd problem I'm having trouble isolating and couldn't find in the FAQ's. All lights on my 90 vert work fine except the high beams. I've checked the dimmer relay out under the hood and it tests out fine. I thought it might be the switch on the turn signal stalk, so picked up one on ebay, but still have the problem. Confirmed that the bulbs themselves aren't the issue, so not sure where to go with this from here. Can live without high beams, but I'd like to fix if I can.
Ideas ?

 

Any thoughts on this ? Car just failed state inspection because no high beams.

 

I'm sorry I can't help, but my '90 vert also does not have working high beams, although I haven't done any troubleshooting yet. Hopefully this bump will get somebody to chime in, if not - I will report back after I investigate.

 

Thanks for the bump and good luck with the troubleshooting on yours. For what it's worth, I was told the most likely issues are the relay under the hood or the cpu. I picked up a used (but supposed to be tested) cpu and plugged it in 2 days ago, still no highs. I had taken it to a shop, not Mazda, and they thought cpu also. Bad news is a new one is over $300 bucks and not sure it will fix the problem. Thinking of looking into a way to direct wire between turn signal stalk and dimmer relay and bypas all the other crap, but I'd rather put it back like original. Sucks to be missing summer driving just because of stupid high beams.

 

The flash-to-pass works while the headlights are down when one pulls on the dimmer switch.

With the headlights are up and turned on, I grounded the dimmer relay and the bright lights come on. This tells me the problem is not the headlights or the relay.

Next, back from the relay towards the ignition switch, is the cpu. How does one test this?

I have access to a 91 FSM but the car in question is a 90 vert with an airbag.

I suppose if one finds the wire in to the cpu, from the dimmer switch on the steering column, and grounds it, thus emulating what the dimmer switch send into the cpu. If the cpu is good, wouldn't it send a ground signal to the relay (which works) and that should dim the headlights?

If the cpu is good then the next culprit might be the dimmer switch on the column. This is a relatively simple switch even though it does have the turn signal switch in it too.

Is there a difference between the 90 vert with airbag and the 91 vert with airbag?

Peace

 

I know this is resurrecting a very old thread, but I'm having this exact same problem on a 1990 vert. I don't really care all that much since I don't have inspection or anything here in Florida, but I'd still like it to work if possible. My flash to pass works when the headlights are down, all of the other lights work, just no highs! Any help would be greatly appreciated.

 

there is a HI/LO relay at the Front of the car.
See the manual and replace it.
Foxed.ca

 

Check out this work around thread for a quick fix for your inspection:

https://www.rx7club.com/2nd-generati...ights-1066826/