laminaytrap

Hi All,

Just bought an rx-7 last week, but i'm not new to cars, electrical or custom builds, so just because the piston spins instead of translates, i am not afraid.

So my question.

Last night i came home from dinner and the hazards were flashing fast and inconsistently. There is also a buzzer sounding inside the cabin coming from the computer thing on the driver's side behind kickplate there.

Car off Turned on turn signals and it makes a constant buzzing, hazards operate as normal, buzzr turns off.

Tried closing doors, locking unlocking doors and hatch w/key no avail

Popped hood, pulled turn/brake BTN? fuse all stops.

I thought the car may have been dying because the alarm may have been on for a bit, so i started it, no issues, battery charged with BTN fuse in and out.

Looked for the box on the passenger side, unplugged and replugged some stuff and no change there either. I am going now to disconnect the battery for a while and hopefully it goes off, but if it happens in the future, or this doesn't work i need to do some troubleshooting.

I haven't been able to find much on the stock alarm systems or the differences between s4/s5 also i don't have a security light, or power anything.

Thanks in advance! I keep this up to date.

Jon

laminaytrap

Pulled the main power for about 45min and replaced, no change.

Also tried to pull the room fuse and that didn't shut it down.

Next i'm going to pull the hazards fuse and the turns to see if they are connected, as those signals seem to override the buzzer etc.

Jon

laminaytrap

http://www.youtube.com/watch?v=j7ud8...ature=youtu.be

Video of the symptoms.

laminaytrap

So after a day now of pulling the BTN fuse when parked this problem has become much more inconsistent, and now i'm leaning away from factory alarm and towards a problem in the ECU controlling the hazard/turn circuit.

My only confusion is in that the buzzer is sounding, which should only happen if there is a problem (low oil/coolant/temp/belt/lights?) but all the door close switches seem to work and it is independent of lighting operation, key position, etc.

Also all fluids are at proper levels, oil change a week ago, and coolant is topped up properly, no bubbles. Very confused that the symptoms are subsiding, probably only on half the time now, although still stops with the turn signal/hazard turned on. If it's a buzzing relay and not the actual buzzer that would make sense too, but i don't know what the stock one sounds like, so if anyone can confirm/deny that sound is the buzzer that would be a help.

The ECU doesn't look very complicated, will probably remove it saturday and disassemble/ clean it up and hope it's fixed after .

satch

iTrader: (1)

Disconnect the plug at the CPU (CPU, located by the driver kick panel, is not the ECU) which houses the G/R, G/Y, Black, Light Green, G/B, G/W and Black/Blue wires. The plug will be one of the two plugs at the bottom of the CPU. This plug deals w/the Hazard/Flasher. See if this stops the buzzing you hear. And when the buzzing occurs are most of the idiot lights on?

laminaytrap

All the idiot lights seem to work properly (checked doors, brake, coolant), they all light at engine startup, but no, no lights on with normal operation and buzzing/flashing.

The only lights that flash are the turn lights on the dash, which obviously flash as the signals flash, now it seems that they are not both always flashing either, sometimes only the left side flashes, other times both and quite sporadically.

I will probably also do the grounds maintenance on Saturday as well in order to eliminate some variables in troubleshooting.

Will try to unplug that connector now.

satch

iTrader: (1)

The Black wire in the plug aforementioned is the ground thus it should have zero voltage w/key to on.

Black/Blue wire powers the unit and has constant voltage (no key).

Green/Red wire has voltage w/the turn signal lever in the left turn position and key to on.

Green/Yellow wire has voltage like just above but w/the lever in the right hand position and key to on.

Green/Black wire has voltage either w/the flashers on or the left hand turn signals on.

Green/White wire has voltage either w/the flashers on or the right hand turn signals on.

laminaytrap

Will do voltage check later tonight, unplugging the connector silences the problem, however obviously there is not turn signals now, although i should have brake lights i assume. My question still is why would the buzzer be going off assuming that this plug pertains only to signal controls. If that is true then there must be an issue within the CPU itself causing a connection to a circuit that was not meant to be connected. Correct me if i am wrong, also is this noise the buzzer or is it a relay which is buzzing?

Also flashers function with the key off so it is most likely related to the Hazards circuit, but makes sense that the signals would interrupt the symptoms (key on and off) due to the fact that these connections are shared between signals and flashers.

So fault in CPU
Fault in Flasher switch/wiring

These should be the most likely culprits

Thanks for your help so far.

Jon

Edit: What conditions cause the buzzer to sound?

satch

iTrader: (1)

The 10 amp Hazard fuse powers this unit. If it's pulled and the sound stops then it's related to the Flasher Relay in the CPU. If the sound doesn't stop then it's not the Flasher relay.

Buzzer in the car sounds off from too high RPM, low oil, low coolant, seat belts not fastened when starting car.

laminaytrap

The buzzer at 7k revs works, sounds like it comes from the dash.
No buzzer for lights on key out
No buzzer for belts

this weird buzzing is coming from the CPU itself. Will check more tonight and update.

satch

iTrader: (1)

That would be a soft beeping sound as opposed to a buzzing.