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 intelligent tester via the certification ECU (smart key ECU assembly) as the steering lock ECU is not connected to the CAN communication system.

WIRING DIAGRAM

A01X4V1E13
*a Steering Lock Motor
*b Main Body ECU (Cowl Side Junction Block LH)
*c Steering Lock Actuator Assembly (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 steps 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. INSPECT STEERING LOCK ECU

    A01X7SOE02
    *1 Component with harness connected: (Steering Lock ECU)

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

      Standard Voltage
      Tester Connection Condition (Steering Lock Position) Specified Condition
      E26-4 (SLP1) - E26-2 (SGND) Locked 11 to 14 V
      E26-4 (SLP1) - E26-2 (SGND) Unlocked Below 1 V

    OK

    GO TO ENTRY AND START SYSTEM (FOR START FUNCTION) (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    NG

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

    A01X149E02
    *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 E26 steering lock ECU connector.

    2. Disconnect the E1 main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E26-4 (SLP1) - E1-18 (SLP) Always Below 1 Ω
      E26-4 (SLP1) or E1-18 (SLP) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      Within specified range (for Power tilt and telescopic) A
      Within specified range (for Manual tilt and telescopic) B
      Outside specified range C

    A

    REPLACE STEERING LOCK ACTUATOR (STEERING LOCK ECU) Click here

    B

    REPLACE STEERING LOCK ACTUATOR (STEERING LOCK ECU) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR