Ford, Volvo Head units pinouts  > Volvo pinouts

Meaning of Head Unit pinout signals

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.
RHEO 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

TEL This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
SPEED This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
CAN-L, CAN-H CAN on board diagnostic bus
CT+,CT- ClockTime or CurrentTime signal from DCF77
12 pins unspecified connector layout
12 pins unspecified connector
12 pins unspecified connector layout
12 pins unspecified connector
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Volvo HU-415 Head Unit visual pinout:
Volvo HU-415 Head Unit diagram
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