Unlock Position Sensor Signal Circuit: Procedure

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Steering Lock Actuator Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Voltage

   Tester connection (Symbols)	Condition	Specified condition
   K28-4 (SLP1) - K28-2 (SGND)	Engine switch off Turn the engine switch on (ACC or IG)	Below 1 V

OK → CHECK PUSH BUTTON START FUNCTION 

NG: Go to next step 

1. Disconnect the K28 connector from the steering lock actuator assembly.
   Fig 2: Checking Steering Lock Actuator Assembly And Power Source Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the K73 connector from the power source control ECU assembly.
3. Measure the resistance according to the value(s) in the table below.

   Resistance

   Tester connection (Symbols)	Condition	Specified condition
   K28-4 (SLP1) - K73-26 (SLP)	Always	Below 1 Ω
   K28-4 (SLP1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE STEERING LOCK ACTUATOR ASSEMBLY