Steering Heater Unit

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.	Content	Measuring condition	Standard
A No. 1	Not used	-	-
A No. 2	Not used	-	-
A No. 3 ↔ Chassis ground	Heater unit GND	Always	Less than 1 Ω
A No. 4 ↔ Chassis ground	Heater unit power supply input	Ignition switch ON	10 - 14 V
B No. 1 ↔ Chassis ground	Heater unit power supply input	Ignition switch ON	10 - 14 V
B No. 2 ↔ Chassis ground	Heater switch input	Turn the ignition switch to ON, and press and hold the heater switch.	9 - 14 V
B No. 3	Indicator light output	-	*
D No. 1 ↔ Chassis ground	Heater GND	Ignition switch ON, heater switch ON	Less than 1 V
D No. 2 ↔ Chassis ground	Thermistor input	Ignition switch ON, heater switch ON	1.5 - 4.5 V
D No. 3 ↔ Chassis ground	Thermistor GND	Ignition switch ON, heater switch ON	Less than 1 V
D No. 5 ↔ Chassis ground	Heater output	Ignition switch ON, heater switch ON	9 - 14 V

*: Illuminates when the ignition switch and heater switch are turned to ON.

NOTE: Connect the each connector of the unit before checking.