Dupesh

video of what's going on so you can see. if I turn the key off it turns on my ecu... so what happens is I turn on the car and it works perfectly runs and drives. but if I hit the headlight switch or wiper motor the car shuts off. kills itself. I've checked all the relays and everything seems good. no fuses blown. if it were a short a fuse would be blown, right? So once I turn the headlight switch the car will shut itself off and if I try to turn it off it will work like normal until this happens where even if I take my keys out I still have power to the power fc. the only way to reset it all is with the battery removed. I noticed from the engine side of things that my headlight relay by the battery will buzz like crazy and so will the TNS relay when I activate the headlights. Also, my headlight motors won't pop up. Has anyone seen this problem and have any ideas? I've checked all my wiring and everything seems fine. everything was working at one point and I've tested everything again so I know its not something like my headlights being broken.

also, everything is mostly stock. no airpump or cat. and aftermarket ecu.

FDAUTO

iTrader: (4)

is your car lowered?

Dupesh

no, stock coils and wheels

FDAUTO

iTrader: (4)

Well... thats all I got lol

This could be a tought one. look at your fender well harnesses anyway just because. Make sure they're not rubbed through. Check to see that the ground near the ecu is healthy as well. Something like this is so incredibly off the wall, it's going to be extremely difficult to solve or crazy easy. There is no in-between lol

rescueranger

iTrader: (15)

try unplugging the cpu #2 and if the issues persist

Redbul

iTrader: (26)

https://www.dropbox.com/sh/4s3ydox2z...3v2Zr4xRa?dl=0

Dupesh

i have and i also opened it up and nope seems to be fine

Dupesh

I can't read Japanese. Can barely read English

Redbul

iTrader: (26)

Sell your car.

Wiring manual WD4009 is the initial wiring manual for Version One (JDM) cars. It should be close to the wiring manual for 1993 USDM cars. You can use the manuals together.

Most of the words in the manual are actually English words written in Japanese special script for foreign words ("Katakana").

Get a "Katakana" chart and have at 'er.

On the other hand, buy Akagi's translation.

Redbul

iTrader: (26)

https://www.rx7club.com/3rd-generati...1157199/page4/

Redbul

iTrader: (26)

Check the elecrtonic part of the ignition switch. The wihite bit at the bottom. It is held on with one screw, that , if it falls out the white piece will come loose and lose contact with the mechanical tab.

Fellow up here had a very similar problem the other day.

Redbul

iTrader: (26)

Has anyone mucked around with your dash (firewall) harness or instrument harnesses, say for an aftermarket alarm?

Looks like some sort of short between your ignition wiring and the combination switch wiring. Trace both back to see if they intersect at the harness behind.

I looks like the combination switch for the headlights has a direct circuit to the headlights through the front (F) harness via the D1-01 connector. The Ignition switch connects to the rest of the system through the front harness X-03 connector.

I suspect you have wires crossed just in behind the combination switch and the ignition switch.

Redbul

iTrader: (26)

Check both sides of the front harness where it passes through the firewall. Someone may have jammed wiring for a aftermarket gauge (or something) through there and shorted out the front harness.

Redbul

iTrader: (26)

https://buyee.jp/item/yahoo/auction/...uggest_history

Redbul

iTrader: (26)

The wire from the combination switch has to run to the front to the headlight relay and then back to the combination switch for the hi:lo switch then back to the headlight.

Dupesh

haven't taken apart my combination switch but I checked the connections and removed fenders to see wiring and everything looks good. BUT!!!! when I plugged in my negative terminal this time everything worked (headlights decided to work, up and down as well) until I tried starting and the car went back to being fucked.... ill keep you updated as I work on it

Redbul

iTrader: (26)

If you have a short in the ignition wiring and other front harness wiring you likely blew fuse this time. Check the pinch points where the front harness passes through the firewall.

Akagis_white_comet

iTrader: (4)

I heard my name mentioned and thought I'd chime in. Before everyone throws the baby out with the bath water, let's all remember that that OP is still quite green and might not be the most well-versed with Wiring Diagrams. We've all been there when just starting out. Plus, Japanese is rather tricky to learn at first, especially if one is inexperienced with wiring diagrams. For clarity, 4009 is the Version 2 wiring book (July 1993 to July 1994). 4003 is the Version 1 book (November 1991 to July 1993). There's more than a few differences that throw a monkey wrench into the mix. Took me a few months to homogenize them so the average person can see how the car changed on the same circuits over time.

From a quick read-through of this thread, car going wacky with ignition switch turned ON suggests something is going screwy with the Circuit Opening Relay or the EGI Main Relay in their wiring. When it goes wacky, power is then being re-routed through the TNS Relay's wiring, operated by the Headlight Switch (first ON position), making it behave as seen on Youtube. This is typically called "backfeeding" and indicates a harness problem.

For the record, the FD is fairly well designed from an electrical perspective. But the execution of that design is where it falters, in the manner that Redbul said (harness too close to tires) Inspecting the Harness is recommended here.