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46 (8+8+10+20) pin ISO 10487 Head Unit / Car Stereo connector layout
46 (8+8+10+20) pin ISO 10487 Head Unit / Car Stereo connector

Head unit pinout abbreviations meaning

Pin
Notation
Pin function

Power pins

Ub+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
/- + Ignition powered. +12 V with the ignition key is in the ACC or ON position.
lightbulb image Backlight adjustment
AUT.ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 
__/ +--- Switched power out

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- The corresponding speaker ground
LINE OUT, LINE-OUT LF, LINE-OUT RF, LIN, LIN-R, LIN-L Audio line out

Misc. pins

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.
Amp Amplifier control
DATA, CLOCK Head unit communication
CAN-L, CAN-H CAN bus
K-BUS K-line bus
SW+B Battery power switch
SDA, SCL, MRQ Head unit communication
CD-IN L+, CD-IN L-, CD-IN R+, CD-IN R- CD-changer audio
RC-IN, RC-GND, /- RC +12V, FB-IN, R-CON Remote control
DWA, DWA-GND, Alarm-GND

anti-theft alarm system

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Blaupunkt Travelpilot RNS149 visual pinout:click to enlarge
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