VEHICLE STABILITY CONTROL SYSTEM Downhill Assist Control Indicator Light does not Come ON

DTC Code DTC Name
Downhill Assist Control Indicator Light does not Come ON

DESCRIPTION

Even if the downhill assist control switch is pressed, the downhill assist control indicator light blinks and downhill assist control does not activate under the following conditions:

  • The transfer is in H4.

  • The brake system is malfunctioning.

  • The temperature of the hydraulic brake booster increases and downhill assist control is temporarily canceled.

WIRING DIAGRAM

C216836E04

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK CAN COMMUNICATION LINE

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus.

      Click here

      OK

      CAN Bus Check indicates no malfunctions in CAN communication.

      Result

      Result

      OK

      NG
    NG

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

    Click here

    OK

  2. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B

      Chassis > ABS/VSC/TRC > Trouble Codes

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    Click here

    A

  3. INSPECT DOWNHILL ASSIST CONTROL SWITCH (COMBINATION SWITCH)

    1. Remove the combination switch.

      Click here

    2. C219806C02

      *a

      Component without harness connected

      (Downhill Assist Control Switch [Combination Switch])

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      15 (+B2) - 9 (E)

      Pressed

      Below 1 Ω

      Not pressed

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPLACE COMBINATION SWITCH ASSEMBLY

    Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU HDCS CIRCUIT)

    1. Disconnect the A7 skid control ECU connector.

    2. Disconnect the i5 combination switch connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A7-44 (HDCS) - i5-15 (+B2)

      Always

      Below 1 Ω

      A7-44 (HDCS) - Body ground

      Always

      10 kΩ or higher

      i5-9 (E) - Body ground

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. READ VALUE USING INTELLIGENT TESTER (DOWNHILL ASSIST CONTROL LIGHT)

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Downhill Assist Control Light

      Downhill assist control indicator light

      ON or OFF

      ON: Indicator light on

      OFF: Indicator light off

      -

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

      Click here

      Chassis > ABS/VSC/TRC > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Downhill Assist Control Light

      Downhill assist control indicator light

      Indicator light ON/OFF

      Observe the combination meter.

      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

      B

      OFF

      Changes between ON and OFF

      A

      Does not change between ON and OFF

      B
    A

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

    Click here

    B

    REPLACE MASTER CYLINDER SOLENOID

    Click here