STEERING LOCK SYSTEM Unlock Position Sensor Signal Circuit

DESCRIPTION

The steering lock ECU sends an unlock position signal to the main body ECU. On receiving the signal, the main body ECU permits an 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 as the steering lock ECU is not connected to the CAN communication system.

WIRING DIAGRAM

A001AR3E12
*a Main Body ECU
*b Steering Lock Actuator (Steering Lock ECU)

CAUTION / NOTICE / HINT

Tech Tips

When the engine switch is off, the main body ECU 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:

With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.

PROCEDURE


  1. CHECK STEERING LOCK ACTUATOR (SLP1 VOLTAGE)

    A001B5IE03
    *1 Component with harness connected: (Steering Lock Actuator)

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

      Standard voltage
      Tester Connection Condition (Steering Lock Position) Specified Condition
      L33-4 (SLP1) - L33-2 (SGND) Locked 11 to 14 V
      L33-4 (SLP1) - L33-2 (SGND) Unlocked Below 1 V

    OK

    GO TO ENTRY AND START SYSTEM Click here

    NG

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

    A001D2ME05
    *1 Front view of wire harness connector: (to Main Body ECU)
    *2 Front view of wire harness connector: (to Steering Lock ECU)

    1. Disconnect the L13 main body ECU connector.

    2. Disconnect the L33 steering lock actuator connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L13-18 (SLP) - L33-4 (SLP1) Always Below 1 Ω
      L33-4 (SLP1) - Body ground Always 10 kΩ or higher

    OK

    REPLACE STEERING LOCK ACTUATOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR