Courtesy of SUBARU OF AMERICA, INC.

Terminal No.

Contents

Measuring condition

Standard

A No. 1

Not used

A No. 2

Not used

A No. 3 ←→ Chassis ground

Steering heater Control Module GND

Always

Less than 1 Ω

A No. 4 ←→ Chassis ground

Steering heater Control Module power supply input

Ignition switch ON

10 - 14 V

B No. 1 ←→ Chassis ground

Heater switch 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

Not used

B No. 4

Indicator light output

⁽¹⁾

D No. 1 ←→ Chassis ground

Heater GND

Ignition switch ON, heater switch ON

Less than 1 V

D No. 3 ←→ Chassis ground

Thermistor GND

Ignition switch ON, heater switch ON

Less than 1 V

D No. 4 ←→ Chassis ground

Thermistor input

Ignition switch ON, heater switch ON

1.5 - 4.5 V

D No. 5 ←→ Chassis ground

Heater output

Ignition switch ON, heater switch ON

9 - 14 V

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

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

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Steering Heater Control Module

Use the Manual With the Right Hardware

When to See a Mechanic