Ignition key buzzer and relay on 308QV

One normally replaces relays, not repair them.

 

The '84-'85 US 308QV SPC indicates that that relay is a timing relay for the interior lights (not associated with the buzzer for the seat belts and ignition key) -- do your interior lights still have the correct/reasonable delay to shutoff?

 

Replacement is available; I can't recall where I found that specific one, but they're out there.

My personal solution was to bypass the relay to keep the door/dome light functions, but lose the delayed dim + buzzer (I'm not missing either.)

 

Unfortunately, they don't show the schematics of what's in the various boxes, but I think you're doing the right thing to look for obviously frazzled components. That purple-black wire is just a common always ground signal going to both. For the others:

The red wire should be +12V with the key "on" (so, with key "on", the voltage between the red wire and the purple-black wire should be +12V).

The green-red wire goes to the door jamb switch (so should be ground with the door open and not ground with the door closed. I.e., door open and key "on", the voltage between red wire and green-red wire = +12V. Door closed and key "on" = 0V).

The black-yellow wire goes to the seat belt switch and the other side of this switch to ground (so should be ground in one case, and not ground in the other, but don't know if seat belt buckled = ground or seat belt buckled = not ground).

The red-white wire goes to the key-in-ignition switch and the other side of this switch is always +12V (so the voltage between this wire and the purple-black wire should be +12V in one case and not +12V in the other).

The brown white wire goes to the unfastened seat belt light in the dash -- if this is working, but the buzzer isn't that might be a clue as well as both not working

Most likely the buzzer assembly is just frazzled somehow, but, if all of these input signals are doing the right thing and the buzzer isn't working, then you can be more sure it is frazzled. Good Hunting!

 

Did my 85 Euro 308 come with a key buzzer?

 

purple-black wire (terminal 31) = always ground

grey wire (terminal +) = always +12V via fuse #6(F)

red-black wire (terminal P) = goes to the RH and LH door jamb switches. Will be connected to ground if either door opened.

black wire (terminal L) = goes to the "-" side of the of the dome light (the "+" side of the dome light is always +12V)

(terminal I = not used)

The logic will be that if the red-black wire (terminal P) is connected to ground (either door opened), the relay will immediately connect the black wire (terminal L) to the purple-black wire (terminal 31) = the dome light illuminates. When the red-black wire is no longer connect to ground (both doors closed), the relay does not immediately disconnect the black wire from the purple-black wire, but only does so after X amount of time has passed.

PS The manual switches for both the dome light and the map light should both work even with this relay removed.

 

Forgot to add that since your relay is latching correctly, but not unlatching = almost certainly a problem with the relay itself. If the trouble was the relay didn't ever latch when you opened the door, then you could have some hope that the trouble was something like a bad connection in the wiring or a blown fuse -- but that's not your symptom. Do let us know if you find a substitute -- my guess would be that there might be something (especially if the terminal names are the same even if the overall shape is not the same).

 

I had the passenger side foot well plate out 2 months ago when I removed my evaporator to install a new larger more powerful blower motor and there are no relays there. No holes in the plate or velcro strips. I didn't see any laying around either. When it gets cooler and I don't have anything to do I will remove the plate again. One screw was hard to get to. Also I have a seat belt warning light on the dash. When I had the dash out to install led lights there where no wires hooked to it and found no loose wires laying around. I don't see any wires going to my seat belts either for a seat belt buzzer and to turn on the seat belt light. This may have something to do with the fertilization when it was brought into the US.