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Old 06-10-2018, 03:44 PM   #1
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Oem infotainment wire help

I need some help from the electrical / audio experts. I am working on adding modern oem functions from my FRS to my restomod 93 MR2. I am adding the infotainment system from a 2015 frs. I have sourced all the oem pieces parts from various places. (Huge thanks to @Joesurf79 for parting out his track car interior)

Item #1 oem mic:
It has three wires coming off the plug just downstream from the mic itself. I do notice the mic itself color codes change at the plug. There are 4 wires in the harness post plug; red, white, black and bare metal.
My stab and guessing the wires are:
The bare metal i assume is a signal shield bare wire (pin 18?)
Red- power to mic amplifier (pin 4?)
Black- neg signal (pin 19?)
White- signal (pin5?)
Ground sent to pin 6 seems to turn on the phone option in the menu

Does this make sense to those who know this better than me?

I am getting an echo and effect to people on the receiving end of the calls? Could be bad connection or because the mic isn’t mounted yet to is picks up sound on both sides? OR did I wire something wrong?

Item #2 the usb / aux port
I have the the oem usb/aux plug. The usb part is very cut and dry it only plugs in one way. The aux port has 4 wires again. Red,black, white and bare.
My thoughts are:
Red - right positive (pin 26)
White - left positive (pin 28)
Black - signal negative (pin 27)
Bare wire - signal ground (pin ?)
Apply ground to pin 11 for the option to be enabled.

Item #3 aux display in
I want the ability to mirror my phone to the screen to show Ways and obd2 apps
I found a thread on this one so it should be:
Video negative - (pin 14)
Video positive - (pin 13)
Apply ground to pin 25 for the option to be enabled.

Backup camera- I have this working like a charm.

Diagram of pins attached.
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