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16 pin (10+6) Toyota Head Unit proprietary connector layout
16 pin (10+6) Toyota Head Unit proprietary connector
p/n 86120-02250

Meaning of Head Unit pinout signals

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. May be used for backlight adjustment in some models.
ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 

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
DATA, CLOCK Head unit communication
SDA, SCL, MRQ Head unit communication (information display and so on)
CD-IN L+, CD-IN L-, CD-IN R+, CD-IN R-, CL, CH, IH, CDL, CDR CD-changer audio
SWG Steering wheel control buttons
18 pin unspecified connector layout
18 pin unspecified connector
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Toyota Corolla (2002-2004) W58300 Head Unit visual pinout:click to enlarge
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