Pinouts >  Genuine Audi Head units  >  Audi pinouts
also for Audi Symphony CQ-JA1070L, CQ-JA1071L, CQ-JA1072L, CQ-JA1073L, CQ-JA1074L. P/n 8E0035195 (CQ-EA1070L), 4D0035195HX (CQ-EA1071L), CQ-EA1072L, CQ-EA1074L for Audi B4, A7

Head unit pinout abbreviations meaning

Pin
Notation
Pin function

Power pins

Ub+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
S-kont Ignition powered. +12 V with the ignition key is in the ACC or ON position.
ILL, LAMP, Lume, iLLUM Backlight illumination
ANT+, P.ANT, 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.
GA This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
__/ +--- Switched power out

Audio pins

RF Front right speaker out
LF Front left speaker out
RR Rear right speaker out
RL Rear left speaker out
COM The corresponding speaker ground
LINE OUT, LINE-OUT LF, LINE-OUT RF Audio line out

Misc. pins

Amp Amplifier control
DATA, Clock Head unit communication
CAN-L, CAN-H CAN bus
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Audi Symphony II Head Unit visual pinout:
Audi Symphony II Head Unit diagram
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