ELECTRONICALLY CONTROLLED BRAKE SYSTEM Brake Hold Standby Indicator Light Circuit

DESCRIPTION


WIRING DIAGRAM

B002BLYE02

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve Click here.

PROCEDURE


  1. PRE-CHECK


    1. If the brake hold standby indicator light does not illuminate even though the brake hold switch (satellite switch set) is pushed, check that the brake hold function operation conditions are met.


      1. The driver's door is closed.

      2. Driver's seat belt is fastened.

      3. The system is normal.

        Tech Tips

        If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.


        • Electronically controlled brake system

        • ABS system

        • VSC system

        • Electric parking brake system

        • Hybrid control system


    NEXT
  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output (for LHD: See page , for RHD: Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B
    C
    A
  3. INSPECT COMBINATION METER ASSEMBLY


    1. Perform the Active Test of the combination meter assembly (meter CPU) using the GTS Click here.

    2. Check the combination meter assembly.

      OK
      The brake hold standby indicator light turns on or off in accordance with the GTS operation.

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table refer back to the table and proceed to the next step before replacing the part Click here.


    NG
    OK
  4. PERFORM ACTIVE TEST USING GTS (BRAKE HOLD STANDBY INDICATOR LIGHT)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Active Test mode on the GTS.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      BH Standby Light Brake hold standby indicator light Indicator light ON/OFF Observe combination meter
    4. Check that the brake hold standby indicator light on the combination meter assembly turns on or off in accordance with the GTS operation.

      OK
      The brake hold standby indicator light turns on or off in accordance with the GTS operation.

    NG
    OK
  5. INSPECT BRAKE HOLD SWITCH


    1. Remove the brake hold switch (satellite switch set) Click here.

    2. Inspect the brake hold switch (satellite switch set) Click here.


    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE HOLD SWITCH)


    1. Disconnect the A16 skid control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A16-23 (HZRI) - N42-7 (+B) Always Below 1 Ω
      A16-23 (HZRI) - Body ground Always 10 kΩ or higher
      N42-4 (E) - Body ground Always Below 1 Ω

    NG
    OK
  7. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY


    1. Turn on the interior lights and check that they illuminate, and then set the switch so that the lights illuminate when the door is opened.

    2. Check that the lights illuminate when the driver door is opened.

      OK
      The interior lights illuminate when the driver door is opened.

    NG
    OK
  8. CHECK HARNESS AND CONNECTOR (CTY TERMINAL)

    B002BBXE02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Skid Control ECU Assembly)


    1. Disconnect the A14 skid control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A14-25 (CTY) - Body ground Driver door open Below 1 V
      Driver door closed Pulse generation

    OK
    NG