STEERING LOCK SYSTEM > Unlock Position Sensor Signal Circuit

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DESCRIPTION

The steering lock actuator assembly (steering lock ECU) sends an unlock position signal to the power management control ECU*1 or power source control ECU*2. On receiving the signal, the power management control ECU permits engine start. This prevents the engine from being started with the steering locked.
The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU because the steering lock ECU is not connected to the CAN communication system.
  1. *1: for 1KR-FE, 1NR-FE
  2. *2: for 1ND-TV

WIRING DIAGRAM


C197479E02


INSPECTION PROCEDURE

HINT:
When the engine switch is off, the power management control ECU*1 or power source control ECU*2 may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following step to wake up the ECU.
Connect the intelligent tester to the DLC3 with the engine switch off, and turn any door courtesy switch ON and OFF at 1.5-second intervals until communication between the intelligent tester and the vehicle begins.

  1. *1: for 1KR-FE, 1NR-FE
  2. *2: for 1ND-TV
1.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)
C195843E03

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

    Standard Voltage:
    Tester Connection
    		Condition (Steering lock position)
    		Specified Condition
    D33-4 (SLP1) - D33-1 (GND)
    		Lock
    		11 to 14 V
    Unlock
    		Below 1 V

    Text in Illustration 
    *1
    		Component with harness connected:
    (Steering Lock Actuator Assembly (Steering Lock ECU))



NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT (SOURCE) CONTROL ECU)


    C193913E02

  1. for 1KR-FE, 1NR-FE

    1. Disconnect the connector from the steering lock actuator assembly (steering lock ECU).

    2. Disconnect the connector from the power management control ECU.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D33-4 (SLP1) - D38-3 (SLP)
      		Always
      		Below 1 Ω
      D33-4 (SLP1) - Body ground
      		Always
      		10 kΩ or higher

      Text in Illustration 
      *1
      		Rear view of wire harness connector:
      (to Power Management Control ECU)
      *2
      		Front view of wire harness connector:
      (to Steering Lock Actuator Assembly (Steering Lock ECU))



    C193913E04

  1. for 1ND-TV

    1. Disconnect the connector from the steering lock actuator assembly (steering lock ECU).

    2. Disconnect the connector from the power source control ECU.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D33-4 (SLP1) - D73-3 (SLP)
      		Always
      		Below 1 Ω
      D33-4 (SLP1) - Body ground
      		Always
      		10 kΩ or higher

      Text in Illustration 
      *1
      		Rear view of wire harness connector:
      (to Power source Control ECU)
      *2
      		Front view of wire harness connector:
      (to Steering Lock Actuator Assembly (Steering Lock ECU))



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (Click here)