Signal Specification

All values below are measured between the relevant terminal in column 1 and terminal #2F in column 2 (power ground). Unless otherwise stated in parenthesis after the table entry.

NOTE: It is important to connect the breakout box and check the ground terminals before taking readings.

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

Connector, headlamp control module (HCM)

Fig 1: Identifying Headlamp Control Module (HCM) Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Control module terminal	Signal type	Ignition on
1A - H1	-	-
2A	Communication CAN_L high speed network	The voltage is 1.5-2.5 V during communication
2B	-	-
2C	Left headlamp control unit (LHCU), LIN communication	During communication the voltage is 0 V - U _bat
2D	Position sensor, ground	U_low
2E	Front position sensor, signal	0.5-4.5 V
2F	Power ground	U_low
2G	-	-
2H	-	-
3A	Communication CAN_H high speed network	The voltage is 2.0-3.5 V during communication
3B	Internal signal	-
3C	Right headlamp control unit (RHCU), LIN communication	During communication the voltage is 0 V - U _bat
3D	Position sensor, voltage supply	5 V
3E	Rear position sensor, signal	0.5-4.5 V
3F	15-feed	U _bat
3G	-	-
3H	-	-
4A - 4H	-	-

Connector, front and rear position sensors

Fig 2: Identifying Front And Rear Position Sensor Connector Terminals

Courtesy of VOLVO CARS CORPORATION

FRONT POSITION SENSOR

Position sensor connection	Control module terminal	Signal type
1	2D	Ground
2	-	-
3	-	-
4	2E	Signal, position sensor
5	3D	Power supply, +5 V
6	-	-

REAR POSITION SENSOR

Position sensor connection	Control module terminal	Signal type
1	2D	Ground
2	-	-
3	-	-
4	3E	Signal, position sensor
5	3D	Power supply, +5 V
6	-	-