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Home >> Toyota >> 2008 >> RAV4 Base, 2.4 D, FWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Vehicle Stability Control System >> Downhill Assist Control Indicator Light Remains ON >> Inspection Procedure

Inspection Procedure

  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if the CAN communication system DTC is output (see DIAGNOSIS SYSTEM ).

      Result 

      DTC RESULT DESCRIPTION

      Result Proceed to
      DTC not output A
      DTC output B

    B: REPAIR CAN COMMUNICATION SYSTEM 

    A: Go to next step. 

  2. CHECK SKID CONTROL ECU CONNECTOR 
    1. Check if the skid control ECU connector is securely connected.

      OK: The connector is securely connected. 

    NG: CONNECT CONNECTOR CORRECTLY 

    OK: Go to next step. 

  3. CHECK WIRE HARNESS (SKID CONTROL ECU - BODY GROUND) 
    1. Disconnect the A19 ECU connector.
      2. Fig 1: Identifying A19 ECU Connector Terminals
      G05585056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      A19-28 (HDCS) - Body ground Downhill assist control switch is pushed Below 1 Ω
      A19-28 (HDCS) - Body ground Downhill assist control switch is not pushed 10 kΩ or higher

    OK: Go to step   6

    NG: Go to next step. 

  4. INSPECT DOWNHILL ASSIST CONTROL SWITCH 
    1. Remove the downhill assist control switch.
      2. Fig 2: Identifying Downhill Assist Control Switch
      G05585033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the switch.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      1 - 4 Switch is pushed Below 1 Ω
      1 - 4 Switch is not pushed 10 kΩ or higher

    NG: REPLACE DOWNHILL ASSIST CONTROL SWITCH 

    OK: Go to next step. 

  5. CHECK WIRE HARNESS (CONTROL SWITCH - SKID CONTROL ECU AND BODY GROUND) 
    1. Disconnect the A19 ECU connector.
      2. Fig 3: Identifying A19 ECU And E31 Switch Connectors Terminals
      G05585034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E31 switch connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      A19-28 (HDCS) - E31-4 Below 1 Ω
      E31-1 - Body ground Below 1 Ω
      A19-28 (HDCS) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step. 

  6. CHECK COMBINATION METER 
    1. Check the combination meter (see HOW TO PROCEED WITH TROUBLESHOOTING ).

    NG: REPLACE COMBINATION METER 

    OK: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY 

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