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20 pin Toyota Head Unit audio connector layout
20 pin Toyota Head Unit audio connector

Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

BAT+ 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.
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
12 pin unspecified connector layout
12 pin unspecified connector
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Toyota old Panasonic CQ-ES0360A, CQ-ES0370A visual pinout:click to enlarge
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