On my 85 GSL-SE I have an issue with a non stop buzzing sound. I have search through the forum to find the answer but i'm still stumped.

As soon as I put the Fuse into the Fuse Box is starts a constant steady buzz. I have unplugged the Oscillator yet it still buzzes. I have no lights on the dash as to why it would be buzzing. The door switches seem to be ok as they change the sound of the buzz when the door is opened or closed. Key in or out, the buzzing is non stop.

Any ideas what else this could be or somewhere else I can start?

 

I've never had an Rx-7 as new as an 85, but what kind of buzzing is it? Is it a buzzer that you've left the key in the ignition or the red line buzzer or other? Sounds like something is getting continual juice. Could there be a relay up stream to the buzzer that is stuck closed?

 

There is a relay just in front of the battery that can cause this. You have to remove the battery to get to it.

 

I had thought that those buzzers sounded the same but I cannot remember.

 

A relay other than the Oscillator?

 

You are correct. The oscillator is what I should have said.

 

Ahh. Yes in the first post I said I unplugged the Oscillator and it still buzzes :P

 

i had one that did this, and it would buzz, the tach would go to like half speed and then when it got temperature warm something would click and it would be completely fine. Oscillator did nothing

i fixed it by selling the car, but the Choke and Check relay and CPU were the next two suspects.

 

The Oscillator was there to allow buzzer operation in the event of low Coolant or low Oil level to help owners prevent a situation that could lead to overheating and killing the engine. When I replaced my Oscillator in about 2006, the stealership said it was one of the last ones in inventory and is now NLA. Most cars which had this suffered from battery acid spillage that quickly eroded the Oscillator and it's connections, and without it working, no buzzer would sound if the Oil level or Coolant level sensors lit on the dash idiot light cluster.

Point being, its unlikely to be the Oscillator, but if you've shorted any of the 4 connections that went to it, that could cause the buzzer to sound. Be sure you've taped those 4 wires or otherwise made them inoperable,

 

When i disconnect the Oscillator the buzzing doesn't stop. Are you saying there might be a short on one of the wires coming/going from the Oscillator? My Oscillator seems to be in very good condition.

Thanks!

 

Which fuse are you placing in to make the buzzing start? I can trace the circuit and see where that circuit feeds a buzzer.

 

ISorry my mistake, it it actually the 15AMP Hazard Fuse. And to my understanding it also controls the turn signals and interior lights/clock?

 

That fuse is part of the turn signal circuit. You might start by unplugging the flasher unit, hazard switch, or turn signal switch one at a time.

Check out the wiring diagram section F in the 1985 Factory Service Manual here: Foxed.ca

 

Thanks! I will dive into that this weekend and hopefully fix the issues. If i unplug the flasher unit im sure it would stop regardless as thats where the buzzer is located, on that module. Ive read in another thread that the solder joints can go bad on those, and that its a pain in the *** to get out. I have found it though, i will just have to see about contorting my body in there to get it

 

Take the seat out and lay on your back with your head near the peddles. It's a pain. Have a 1/4 drive with long extension and a 10mm socket at hands reach. A small LED light also helps.

 

The thing about the Oscillator and it's associated wiring being in play is that the Oscillator is basically a relay that takes signals from the Coolant and Oil Level Sensors and triggers the dash buzzer when either of those carry current. If you remove the Oscillator (relay), but somehow shorted out the leads, it could cause the buzzer to sound non-stop.

I'd recommend checking those 4 wires at the Oscillator location in front of the battery and make sure they're not pinched or wired together.

 

So i am still fighting this buzzing issue.

Buzzer constantly on. Does not matter if the key is in or out - If the hazard fuse is in the fuse box there is a buzzing sound. The doors can be closed, key out of ignition and its still buzzing. Lights on or off it doesnt matter. I have checked all the door and trunk switches. Its not the low coolant sensor, its not the oil sensor, and its not the oscillator.

I have no clue what else it could be. Is there a seatbelt buzzer? I also don't know if I have a seatbelt idiot light either? I know the buzzing is coming from the hazard relay box, i just dont know why. I would like to fix the buzz before just disconnecting the buzzer as I would like it work as intended.

 

Yes - there is a seatbelt warning buzzer. The wiring diagram shows the buzzer is part of the CPU.

Find Service Manuals Here - Look in Wiring Diagram Section H

 

I have unplugged/plugged in the seatbelt switch with no difference. I also noted though that I do not have a Seatbelt Light that illuminates on the gauge cluster. Am I supposed to have one? Even with it plugged in and all that, no illumination light.

 

I'll need to look at the Factory Service manual. Foxed.ca has the manual for the 1985. A good read might be the plain right now. I would look at the Body Electrical section here http://foxed.ca/rx7manual/manuals/19...Electrical.pdf and start checking votages.

 

pull fuses one by one

 

I think it could be the light switch on the door frame....

 

So since the buzzer is located on the back of the gauge cluster I looked at the wiring diagram to sort out where that wire actually comes from to produce the noise. It's a green wire from the flasher relay cpu. On the box itself it is pin M. Much easier to de-pin the harness than to take the gauge cluster out. It's now electrical taped up to the harness never to see the light of day again lol
I tested everything to try and see what was causing the buzzer to do it things but could not figure it out. I even went as far as the wiring on the door lock cylinder illumination because it's on the same circuit. Either way. I'm going to leave it at that. What a headache to be doing this in 40 degree Celsius weather.

 

Glad you fixed it! My next suggestion was to look for 13 bees.