April 5, 2026: LEMON Manuals is launched! Read the announcement.

Rain Sensor

Fig 1: 10 CD Changer Connector Terminals

GLL104029

Courtesy of VOLVO CARS OF NORTH AMERICA.

Connector A, terminals #A1-#A5

U = DC in volts (V).

Ubat = battery voltage in volts (V).

Ulow = Voltage close to 0 V.

Terminal, control module	Signal type	Ignition off	Ignition on	Other
#A1	Serial communication			Data signal
#A2	Ground	Ulow	U _low
#A3	Power supply	Ubat/0 V	U_bat /0 V
#A4	Windshield wiper position signal	-	U_bat /0V	When the windshield wipers are in the parked position, U must be U_bat . When the windshield wipers are operating U must be 0V (grounded).
#A5	Not used