Signal Specification

All the values given below are between the respective terminal in column 1 and terminal #A2 in column 2 (power ground) unless otherwise stated in brackets after the table entry.

NOTE: It is important to check ground terminals before taking readings.

U=	DC voltage in volts (V)	U_low =	Voltage approximately 0 V
U_bat =	Battery voltage (V)	-	-

Fig 1: Identifying Connector A

Courtesy of VOLVO CARS CORPORATION

CONNECTOR A

Terminal	Breakout box terminal	Signal type	Ignition on	Other
#A1	-	30 supply	U = U_bat	-
#A2	-	15 supply	U = U_bat	Relay voltage
#A3	-	-	-	-
#A4	-	Ground	U=U_low	-

Fig 2: Identifying Connector B

Courtesy of VOLVO CARS CORPORATION

CONNECTOR B

Terminal	Breakout box terminal	Signal type	Ignition on	Other
#B1	-	MOST input signal	Optical input signal when the MOST network is activated	-
#B2	-	MOST output signal	Optical output signal when the MOST network is activated	-