Fig 1: Identifying Control Module I/O Signal Connector Terminals - Steering Lock CONTROL MODULE

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.	Terminal symbol	Contents
(B424) No. 1	GND	GND
(B424) No. 3	SLR+	Steering lock motor drive power supply
(B424) No. 4	SLP	Unlock position output
(B424) No. 5	LIN	LIN communication
(B424) No. 6	IG2	IGN power supply
(B424) No. 7	B	+B

NOTE: Perform the following check from the back side of the connector, with the connector of the control module connected.

If the measured value is out of standard, it is possible that the vehicle has a fault.

Terminal No.	Standard	Measuring condition	Item
1 (GND) ←→ Chassis ground	Continuity exists	Always	Continuity
-	-	-	-
3 (SLR+) ←→ Chassis ground	10 - 14 V → 1 V or less	Motor not operating → Motor operating	Voltage
4 (SLP) ←→ Chassis ground	10 - 14 V → 1 V or less	Lock → Unlock	Voltage
5 (LIN)	Input/output signal	-	-
6 (IG2) ←→ Chassis ground	10 - 14 V	Ignition ON	Voltage
7 (B) ←→ Chassis ground	10 - 14 V	Always	Voltage

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 Lock Control Module