Turn signal help- all lights work except turn signal-FIXED

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Seeing if anyone can help.

ALL the lights work except the turn signals.
Headlights Low and High beams- work
Headlight Boomerang light- work
tail lights- work
Brake lights- work
Hazard Lights- work
Dome light- works

Ive checked all fuses-good, relays-good(even replaced relay under dash just in case), replaced Blinker Switch

All stock 2018 Subaru BRZ 50th Anniversary. No aftermarket lights.

[DarkPira7e]

You're testing this with the car running, or at least in ign. on, right?

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Originally Posted by DarkPira7e

You're testing this with the car running, or at least in ign. on, right?

Correct with ignition on, also with car running

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FIXED- What I did.

-Checked fuses-good.
-“Turn Signal Flasher Assembly” replaced with known good one- blinkers still not working.
-“Combination Switch” replaced with known good one- blinkers still not working
-Wires running from fuses were HOT with ignition “ON”.
-Continuity present on all grounds.
EVERYTHING checked out good! What was left to check that was part of the blinkers??? The “MAIN BODY ECU”(circled in GREEN) in the AllData pic. Which controls the “TURNL” and the “TURNR”(circled in BLUE) in AllData pic.
Changed it out. NOW EVERYTHING WORKS LIKE IT SHOULD!!
Pic of part changed out with part#.
Hope this helps someone else out.

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Part and location

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FYI I got the part from “Mani Valen” on Facebook. He has a bunch of FRS/BRZ/86 part outs.

[Compelica]

Possibly explains why the main body ECU has to be replaced when it comes to certain lights not working as it should:

https://www.ft86club.com/forums/show...0&postcount=30

The BIU (body computer) has a series of diodes inside on the door switch grounding to isolate the two door triggers. This so that the window drop feature when door is opened on one side or another can operate independently and not drop both windows when one door is opened. Now diodes are a tricky things designed for a very specific electrical loads and do heat up and blow if they are loaded with more devices like adding lamps, or using LED with dedicated diodes within it too.

The diodes in the BIU aren’t replaceable and are part of the circuit board so if you blow diodes on the BIU, you’re pretty much going to need to replace it. Upon replacement, you also need to reprogram it as it retains the codes for the ignition key chip transponder as well as ECU handshake, and radio key for remote key fob. (Spelled very expensive trip to the dealer).

So if you’re installing an aftermarket addition, such as alarm triggers, auxiliary power ports, or to the interior lamp or anything on a BIU circuit, it’s best to just run new set of wires separately, and isolated from BIU circuits.