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I do have some weird turn signal resp. hazard behavior after replacing my engine. Its a S4 NA from 1987 (EU version as I am from Germany). I just replaced the 6 port with a new motor of the same type. No swaps or anything of that sort. The car is pretty much stock all around except Tokico suspension which has nothing to do with my current issue. Everything worked fine before putting the new motor in. I disconnected the ECU during a few weeks which I don't think should have any effects. Car sat for 6 years in my hangar.
Here is what it does:
Hazard lights: The turn signals on both front fenders don't light up.
Turn signals left: The turn signals on both front fenders light up simultaneously.
Turn signals right: Same behavior as left.
Now, the front and rear turn signals work just fine for normal use and hazard, its just the fender ones who go nuts.
What I did check:
I opened up the CPU and checked the flasher module. I could not find anything obvious. No damaged components or soldering joints. All looks pristine.
Then I replaced the turn signal switch on the dash bezel: Same behavior. So I put the old one back in. I found a few threads concerning turn signals or hazard issues, but nothing related to what I am seeing ...
Weird ...
I d be happy if anyone does have some pointers
I'm pretty sure here that here in North America the fender lamps are just marker lamps and don't have anything to do with the signal circuit or the hazard lights.
This is how it's wired in North America:
Hazards ON - front and rear signals flash, side markers do not.
Signal Left/Right-front and rear signal flash, side markers do not.
I'm trying to find a euro wiring diagram for you that might shed more light on the issue. Maybe someone reading this has one. From what I gather it does seem that you have a different setup in Europe which includes signals on fenders so the wiring diagrams I have aren't too useful.
Could you post photos of the location of your marker lamps? I'm finding hints that they are in a different location on the fender. I'm just curious as to how they look on the car.
Last edited by Rotary Alkymist; 06-30-19 at 03:06 PM.
Are your fender lamps on with park lights ON?
Or are the only supposed to be on when signalling?
If they are on when park lights are ON then those are dual filament lamps. I'm just wondering if this is Mazda's way of letting you know have a dead bulb. I'm also wondering if they share a relay or have a dedicated relay.
I'm having a hard time finding euro wiring schematics.
I suppose they are different then the US version. I have attached a pic of a S4 NA EU spec. For reference, our FCs also still have the thermal reactor and dizzy cap ignition distributor from the 1st gen FB!
The EU version does have a side turn signal on every front fender. (Pretty much every car here has those, usually on the mirror for newer models) They work just like the regular front and rear turn signals. They are also supposed to flash when you hit the hazard button.
The parking lights (white for front and red for rear, we have no side markers) are not related and are completely separated. The bulbs clearly work as both fender turn signals come on when I hit either left or right turn signals on the switch. It should only be the respective side that I selected, not both.
Fender turn signals are off when I select parking lights.
The front turn signal element is designed like this: White parking light on the outside (5W bulb) and turn signal on the inside (21W bulb) with an orange colored filter behind the clear lens.
Requested picture:
And here is a S4 NA EU spec the engine bay just to complete the EU oddities:
Cool. Thanks for taking the photos. I just wanted to see it! It's the first time I see this style. Your car seems fairly clean. I kinda like the fender lights. I also think you guys have the coolest rear lights. You're right woah, you still have a distributor! Even after 20 years I'm still learning new stuff about this car every day. It's like a stock frankenstein!
It's too bad you don't have another CPU. Without a schematic it's hard to say if that would change anything. There's nothing worse than spending money on parts you don't need. I would love to know where the side signal wires lead to. Hopefully someone will chime in with some info your model.
Cool. Thanks for taking the photos. I just wanted to see it! It's the first time I see this style. Your car seems fairly clean. I kinda like the fender lights. I also think you guys have the coolest rear lights. You're right woah, you still have a distributor! Even after 20 years I'm still learning new stuff about this car every day. It's like a stock frankenstein!
It's too bad you don't have another CPU. Without a schematic it's hard to say if that would change anything. There's nothing worse than spending money on parts you don't need. I would love to know where the side signal wires lead to. Hopefully someone will chime in with some info your model.
The white FC you see is basically just a part donor now. I used it to show the turn signals. It is the same type as the other one. They are both EU. Here is the real one:
I have upcoming technical inspection so I did a quick workaround. I disconnected both fender turn signals and spliced the front turn signals and ran them towards the side turn signals in parallel. Done!
Now the front feeds both, a 21W bulb and a 5W one. Works pretty good,
The original turn signals on the fenders have a 2 pin connector which leads directly into the harness that passes the passenger resp. drivers strut tower. No idea where it leads to. I dont need them anymore anyways.
I am sure the dizzy is still 100% from the FB version, lol. Well at least it works ... This FC also doesn't have an initial set coupler and other gimmicks that you can find in the FSM so I am often on my own.
06-30-19, 08:21 AM
