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26 (10+8+8) pin ISO 10487 Head Unit / Car Audio connector layout
26 (10+8+8) pin ISO 10487 Head Unit / Car Audio connector

Abbreviations of head unit pinouts

Pin
Notation
Pin function

Power pins

GND, GROUND Chassis Ground
ACC Ignition powered. +12 V with the ignition key is in the ACC or ON position.
LAMP Backlight illumination
ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 
MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.

Audio pins

FR+ Front right audio out
FL+ Front left audio out
RR+ Rear right audio out
LR+ Rear left audio out
FR-, RF-, FL-, LF-, RR-, LR-, RL- The corresponding audio ground
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Alpine ALfa Romeo 932 RDS visual pinout:click to enlarge
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