Steering Heater Unit

Fig 1: Steering Heater Unit Connector Terminals

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.

Content

Measuring condition

Standard

ST11 No. 1

Not used

ST11 No. 2 ←→ Chassis ground

Heater switch power supply input

Ignition switch ON

10 - 14 V

ST11 No. 3 ←→ Chassis ground

Heater unit GND

Always

Less than 1 Ω

ST11 No. 4 ←→ Chassis ground

Heater unit power supply input

Ignition switch ON

10 - 14 V

ST9 No. 1 ←→ Chassis ground

Heater switch power supply input

Ignition switch ON

10 - 14 V

ST9 No. 2 ←→ Chassis ground

Heater switch input

Turn the ignition switch to ON, and press and hold the heater switch.

9 - 14 V

ST9 No. 3

Indicator light output

⁽¹⁾

ST10 No. 1 ←→ Chassis ground

Thermistor input

Ignition switch ON, heater switch ON

1.5 - 4.5 V

ST10 No. 2 ←→ Chassis ground

Thermistor GND

Ignition switch ON, heater switch ON

Less than 1 V

ST10 No. 3 ←→ Chassis ground

Heater output

Ignition switch ON, heater switch ON

9 - 14 V

ST10 No. 4 ←→ Chassis ground

Heater GND

Ignition switch ON, heater switch ON

Less than 1 V

⁽¹⁾	Illuminates when the ignition switch and heater switch are turned to ON.

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