Unlock Position Sensor Signal Circuit: Procedure

WARNING: This page is about a different car, the 2012 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

Measure the voltage according to the value(s) in the table below.

Fig 1: Identifying SLP1 And SGND Of E39 Connector Terminal

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Standard Voltage

Tester Connection	Switch Condition	Specified Condition
E39-4 (SLP1) - E39-2 (SGND)	Engine switch off Engine switch on (ACC or IG)	Below 1 V

NG → See step 3

OK: Go to next step

CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU)

Disconnect the E39 connector from the steering lock actuator assembly.

Fig 2: Identifying Steering Lock Actuator Assembly And Main Body ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the E50 connector from the main body ECU.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
E39-4 (SLP1) - E50-18 (SLP)	Always	Below 1 Ω
E39-4 (SLP1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 4

CHECK SMART KEY SYSTEM (for Smart Function). Refer to HOW TO PROCEED WITH TROUBLESHOOTING
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE