VEHICLE STABILITY CONTROL SYSTEM(for Hydraulic Brake Booster) Crawl Indicator Light does not Come ON

DESCRIPTION

If the following condition is met, the crawl indicator light turns off and crawl control is stopped.


If any of the following conditions are met, the crawl indicator light blinks and crawl control is stopped.


When the vehicle is driven at 25 km/h (16 mph) or more during crawl control, control is temporarily stopped and the crawl indicator light blinks.

When using crawl control continually for a long period of time, if the temperature inside the hydraulic brake booster becomes too high, the crawl indicator light will turn off. After a while, the temperature decreases and crawl control becomes operable.

WIRING DIAGRAM

B001E41E12

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (master cylinder solenoid), perform calibration Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION LINE


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (w/ Central Gateway ECU: See page , w/o Central Gateway ECU: Click here.

      OK
      CAN Bus Check indicates no malfunctions in CAN communication.
      Result
      Result Proceed to
      OK A
      NG (w/ Central Gateway ECU) B
      NG (w/o Central Gateway ECU) C

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. CHECK FOR TEST MODE DTC


    1. Perform the downhill assist control switch check in the Test Mode Procedure Click here.

      OK
      Test mode DTC C1379 is cleared.

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - MASTER CYLINDER SOLENOID) Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (CRAWL CONTROL LIGHT)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Crawl Control Light Crawl indicator light Indicator light ON/OFF Observe combination meter

    6. When performing the Crawl Control Light Active Test, check Crawl Control Light in the Data List.

      Click here

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Crawl Control Light Crawl indicator light/ ON or OFF

      ON: Indicator light on

      OFF: Indicator light off

      		 -
      Result
      Result Proceed to
      Data List Display Data List Display when Performing Active Test ON/OFF Operation
      ON Changes between ON and OFF A
      Does not change between ON and OFF (for LHD) B
      Does not change between ON and OFF (for RHD) C
      OFF Changes between ON and OFF A
      Does not change between ON and OFF (for LHD) B
      Does not change between ON and OFF (for RHD) C

    A

    GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

  4. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - MASTER CYLINDER SOLENOID)


    1. Disconnect the G156 downhill assist control switch (combination switch assembly) connector.

    2. Disconnect the A7 skid control ECU (master cylinder solenoid) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-28 (HZRI) - G306-5 (+B2) Always Below 1 Ω
      A7-28 (HZRI) or G306-5 (+B2) - Body ground Always 10 kΩ or higher
      G306-2 (E) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT COMBINATION SWITCH ASSEMBLY


    1. Remove the combination switch assembly Click here.

    2. Inspect the combination switch assembly Click here.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE MASTER CYLINDER SOLENOID Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE COMBINATION SWITCH ASSEMBLY Click here