91 vert no high beams/indicator
#1
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91 vert no high beams/indicator
got a safety inspection tomorrow and I got everything finished besides my high beams! so yeah I click the high beams and nothing happens and also the light on the dash doesn't come on. any help will be appreciated!
#2
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The dimmer relay is located at the front of the car in front of the radiator alongside other relays (found next to the headlight relay). When the high beams are supposed to be on the Red/White wire should have voltage. If it does not then the relay is likely the problem (also could be the lever in the car is not sending the proper signal to the relay)
#3
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The dimmer relay is located at the front of the car in front of the radiator alongside other relays (found next to the headlight relay). When the high beams are supposed to be on the Red/White wire should have voltage. If it does not then the relay is likely the problem (also could be the lever in the car is not sending the proper signal to the relay)
#4
MECP Certified Installer
It's an S5 so the lever in the car bumps ground to a latching circuit within the CPU that often fails. When the circuit in the CPU fails the High beam the high beam relay will never energize.
The day before inspection is a rellay bad time to post this...
The day before inspection is a rellay bad time to post this...
#5
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I know it is car had a lot of problems and this seems to be the last one for a while I hope lol. I might just make a switch for it if possible
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#10
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Edit: Does your car have an air bag or not?
Last edited by satch; 06-24-16 at 08:49 PM.
#11
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oops didn't see the white one now I do had to move a bunch around but yes the high beams and indicator come on now with it grounded
#13
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#17
MECP Certified Installer
Most likely, your airbag light flashes 7 times, and that means your airbag computer is dead but alive enough to tell you it's dead.
As far as you horn, if the relay is clicking and it doesn't work, you don't have power on the working side of the relay, check your fuses.
#19
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The FC66 CPU in the 90-91 airbag equipped vert with the oddball steering column and switch layout is WELL known for this exact failure. Even the guys that repair electronics for a living say that they have limited to no success restoring the old FC66 CPUs with this issue. You are likely going to have to buy a new one from mazda to resolve this fully, without rigging up the car. The part costs around $300 if memory serves and is a 5 minute install. Then your security system, bright lights, and other "body control" functions of the car will work right again. I actually tried 3 used CPUs and tried resoldering all without full success before I just broke down and bought a new one. Boom, everything is right again.
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