Signal Specification, Rear Audio Separation

U=	DC voltage in volts (V)	UAC =	AC voltage in volts (V)
Ubat =	Battery voltage (V)	f =	Frequency in Hertz (Hz)
Ulow =	Voltage approximately 0 V	t =	Time in seconds
PWM =	Pulse width modulated signal as a %	-	-

Fig 1: Identifying 16-Bit Connector

Courtesy of VOLVO CARS CORPORATION

SIGNAL TABLE

Terminal	Signal type	Ignition on	Other
#A1	Battery voltage supply	Ubat	-
#A2	Switch signal for reverse warning	-	Connects audio from the reverse warning system to the rear speakers when reverse gear is engaged.
#A3	Left audio (in)	-	From DVD player.
#A4	Audio ground	-	For audio signal from DVD player. Internally connected to terminal #12
#A5	Loudspeaker signal left-hand (L+) (out)	-	Rear speakers, high level audio.
#A6	Loudspeaker signal left-hand (L-) (out)	U=Ulow	Rear speakers, high level audio.
#A7	Loudspeaker signal right-hand (R-) (out)	U=Ulow	Rear speakers, high level audio.
#A8	Loudspeaker signal right-hand (R+-) (out)	-	Rear speakers, high level audio.
#A9	Ground terminal control module	U=Ulow	-
#A10	Activation signal for rear audio separation (RAS)	Approx. 7-9 V when function is activated.	Connecting function. From Rear seat entertainment module (RSE).
#A11	Right audio (in)	-	From DVD player.
#A12	Audio ground	-	For audio signal from DVD player. Is internally connected to terminal #4.
#A13	Incoming loudspeaker sound (L+)	-	Input signal from the front audio system.
#A14	Incoming loudspeaker sound (L-)	-	Input signal from the front audio system.
#A15	Incoming loudspeaker sound (R-)	-	Input signal from the front audio system.
#A16	Incoming loudspeaker audio (R+)	-	Input signal from the front audio system.