Lexus and Toyota Head units pinouts  > Lexus pinouts

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- 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 Amplifier control
CD-IN L+, CD-IN L-, CD-IN R+, CD-IN R- CD-changer audio

 

20 pin Lexus/Toyota Head Unit proprietary of Lexus P1750 connector layout
20 pin Lexus/Toyota Head Unit proprietary connector
20 pin Lexus/Toyota Head Unit accesory proprietary of Lexus P1750 connector layout
20 pin Lexus/Toyota Head Unit accesory proprietary connector
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