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Madd Tyte JDM yo ®
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7,014 Posts
Discussion Starter · #1 ·
that original wiring diagram floating around here is wrong. I edited the wiring chart to reflect my changes.


the black on the toyota in-dash wiring is NOT chassis ground. it is one of the terminals for the rear speaker, the other terminal being YELLOW.

the Chassis ground on the toyota in-dash wiring is BROWN. this ground wire terminates at the 10mm bolt behind the shifter under the center console! connect the Black radio ground of the aftermarket repair harness to this Brown wire.

I verified this w/ my DVM. the BLACK wire in the dash has NO continuity the this chassis ground. however, the brown wire DOES. less than 1.0 ohm resistance too.
http://cygnusx1.net/supra/library/Wiring/pages/Page_134.html

if you connect your Reverse/repair wiring harness (Scosche PN TA02RB) to the Black wire for radio ground, you WILL damage something. I am currently repairing my hacked wiring w/ the dash out of the car, and alt+Tab'ing between the TEWD and This diagram.

EDIT; found out something else too.

Toyota conn A, pins 8 and 9 (Scosche TA02RB, pins H and I) for power antenna and Remote Amp turn-on.

Toyota colors:
Pin 8: Black/Red
Pin 9: Pink/Blue

Scosche colors:
Pin H: Blue
Pin I: Blue/White

Connect Scosche Blue wire to Toyota Dash Black/Red to control Antenna
Connect Scosche Blue/White wire to Toyota Dash Pink/Blue to control Antenna.
http://cygnusx1.net/supra/library/Wiring/pages/Page_130.html

EDIT2: the Illumination/Dimmer wire.
Scosche pin J-Orange/White, Toyota Pin 10-Green. this is the power input to the Radio's illumination from the headlight switch. Connect Toyota In-dash GREEN wire to Scosche Pin J (orange-white) for radio illumination power FEED.

Scosche pin O-Orange/black, Toyota pin 5-White/green. This is the path to ground (dimmer rheostat, Then to ground). Connect Toyota In-dash White/Green wire to Scosche pin O (orange-black) for radio illumination Ground.
http://cygnusx1.net/supra/library/Wiring/pages/Page_063.html
 

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Madd Tyte JDM yo ®
Joined
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7,014 Posts
Discussion Starter · #3 ·
thanks bro ;) i figured i wasnt the only one who is going to be doing radio wiring in an MK3. id hate to hear about someone frying their radio or wiring because they hooked up the wrong ground, or power or whatever.
 

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Moderator, l337 M0d3r4t0r
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12,276 Posts
ha i just looked at my tsrm i when i installed another deck yesterday... dind't even think there was one floating around nice thanks for the update for easy refrence gonna save to my hd now ;)
 

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Madd Tyte JDM yo ®
Joined
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7,014 Posts
Discussion Starter · #5 ·
thats what i thought i was gonna do... since i could easily see what color wire goes to what. the only thing i couldnt see from the TEWD was which speaker wire was pos and which was Neg. youd think Toyota would have used one color wire per channel and just add a black stripe to the negative terminal... :ugh2:
 

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Supranian
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2,007 Posts
I think you have the ground wire colors reversed in your diagram, but good update nevertheless.
Thanks....
 
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