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20 pin Toyota Head Unit audio connector layout
20 pin Toyota Head Unit audio connector
PIONEER DEX-MG9967zt, p/n 86120-60870

Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

B+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
ACC Ignition powered. +12 V with the ignition key is in the ACC or ON position.
ILL Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on.

Audio pins

FR+ or RF+ Front right speaker out
FL+ or LF+ Front left speaker out
RR+ Rear right speaker out
LR+ or  RL+ Rear left speaker out
FR- or RF-, FL- or LF-, RR-, LR- or RL-, SGND The corresponding speaker ground

Misc. pins

MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
Amp, ATX+, ATX- Amplifier control
CD-IN L+, CD-IN L-, CD-IN R+, CD-IN R- CD-changer audio
TXM+, TXM-, TXS+, TXS- Changer to Head unit (Master) and Head Unit to changer (Slave)
20 pin Lexus/Toyota Head Unit accesory proprietary connector layout
20 pin Lexus/Toyota Head Unit accesory proprietary connector
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