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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes & Symptom Tests - (Hybrid) >> Electronically Controlled Brake System >> Symptom Tests >> Brake Warning Light Remains ON [02/2014 - 11/2016] >> Procedure

Brake Warning Light Remains ON [02/2014 - 11/2016]: Procedure

  1. CHECK DTC 
    1. Check if ABS, VSC and/or electronically controlled brake system DTCs are output.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    Result:  2

    B 

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [02/2014 - 11/2016] 

    Result:  1

    A 

    See step  2

  2. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if CAN communication system DTCs are output.

      Refer to DIAGNOSIS SYSTEM [02/2014 - 11/2016]

      Result

      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    Result:  2

    B 

    INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - 11/2016] 

    Result:  1

    A 

    See step  3

  3. CHECK IF SKID CONTROL ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED 
    1. Check if the skid control ECU assembly connector is securely connected.

      OK

      The connector is securely connected.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    CONNECT CONNECTOR TO SKID CONTROL ECU ASSEMBLY CORRECTLY 

    Result:  1

    OK 

    See step  4

  4. CHECK AUXILIARY BATTERY 
    1. Check the auxiliary battery voltage.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Auxiliary battery Power switch on (IG) 11 to 14 V
      Auxiliary battery Power switch on (READY) 11 to 15.5 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    CHARGE OR REPLACE AUXILIARY BATTERY 

    Result:  1

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) 
    1. Disconnect the A63 skid control ECU assembly connector.
      GTY432654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU Assembly)
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A63-2 (IG1) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

    Result:  1

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (GND TERMINAL) 
    1. Turn the power switch off.
      GTY445978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU Assembly)      		 - -
    2. Disconnect the A65, A62 and A64 skid control ECU assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A62-1 (GND) - Body ground Always Below 1 Ω
      A63-3 (GND2) - Body ground Always Below 1 Ω
      A63-1 (GND3) - Body ground Always Below 1 Ω
      A64-3 (GND4) - Body ground Always Below 1 Ω
      A64-1 (GND5) - Body ground Always Below 1 Ω
      A65-3 (GND6) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

    Result:  1

    OK 

    See step  7

  7. READ VALUE USING TECHSTREAM (PARKING BRAKE SWITCH ASSEMBLY) 
    1. Reconnect the A63, A65, A62 and A64 skid control ECU assembly connectors.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [02/2014 - 11/2016]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Parking Brake SW Parking brake switch assembly ON or OFF ON: Parking brake applied
      OFF: Parking brake released      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Parking Brake SW
    5. Using the Techstream, check if the switch condition on the Techstream changes according to parking brake operation.

      OK

      The Techstream displays ON or OFF according to parking brake operation.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  9

    Result:  1

    OK 

    See step  8

  8. READ VALUE USING TECHSTREAM (BRAKE WARNING LIGHT / RED (MALFUNCTION)) 
    1. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [02/2014 - 11/2016]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Brake Warning Light Brake warning light / red (malfunction) ON or OFF ON: Warning light on
      OFF: Warning light off      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Brake Warning Light
    2. Check the Techstream display condition of the brake warning light / red (malfunction).

      Result

      Result Proceed to
      Display of the Data List remains OFF. A
      Display of the Data List remains ON. B

      HINT: 

      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 parts.

      Refer to PROBLEM SYMPTOMS TABLE [02/2014 - ]

    Result:  1

    A 

    INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - ] 

    Result:  2

    B 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

  9. INSPECT PARKING BRAKE SWITCH ASSEMBLY 
    1. Turn the power switch off.
      GTY443237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Parking Brake Switch Assembly)
    2. Disconnect the A58 parking brake switch assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (+) - Body ground Parking brake switch assembly on
      (Switch pin free)      		 Below 1 Ω
      1 (+) - Body ground Parking brake switch assembly off
      (Switch pin pushed in)      		 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE PARKING BRAKE SWITCH ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  1

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - PARKING BRAKE SWITCH ASSEMBLY) 
    1. Disconnect the 4F instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A58-1 (+) - 4F-28 Always Below 1 Ω
      A58-1 (+) or 4F-28 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  11

  11. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
      GTY443316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly - -
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4F-28 - 12 (PKB) Always Below 1 Ω
      4F-28 or 12 (PKB) - Body ground Always 10 kΩ or higher

      HINT: 

      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 parts.

      Refer to PROBLEM SYMPTOMS TABLE [02/2014 - ]

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [02/2014 - 11/2016] 

    Result:  2

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [02/2014 - 11/2016] 

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