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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Restraints >> Seat Belts >> Pre-Collision System - Diagnostic Codes & Circuit Tests - (Hybrid) >> Pre-Collision System >> DTC C1A4A: Skid Control Buzzer Circuit [11/2016 - ] >> Procedure

DTC C1A4A: Skid Control Buzzer Circuit [11/2016 - ]: Procedure

  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Clear DTCs 

    2. Perform the Active Test according to the display on the Techstream.

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

      NOTE:

      Perform the Active Test for 1 second or more.

      HINT: 

      Performing the Active Test for 1 second or more causes DTC C1A4A to be stored if the DTC detection conditions are met.

      Body Electrical > Pre-Collision 2 > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      PCS Crash Alarm Buzzer Skid control buzzer assembly ON / OFF Test possible with power switch on (IG), vehicle stopped

      Body Electrical > Pre-Collision 2 > Active Test 

      Tester Display
      PCS Crash Alarm Buzzer
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Trouble Codes 

      Result

      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    Result:  1

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  2

    B 

    See step  2

  2. CHECK TERMINAL VOLTAGE 
    1. Disconnect the A59 skid control buzzer assembly connector.
      GTY719677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Buzzer Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A59-2 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
    3. Connect the A59 skid control buzzer assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - AUXILIARY BATTERY) 

    Result:  1

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the A59 skid control buzzer assembly connector.
    2. Disconnect the F126 driving support ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A59-1 (BZ) - F126-3 (BZ) Always Below 1 Ω
      A59-1 (BZ) or F126-3 (BZ) - Body ground Always 10 kΩ or higher
    4. Connect the F126 driving support ECU assembly connector.
    5. Connect the A59 skid control buzzer assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    See step  6

    Result:  2

    NG 

    See step  4

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY) 
    1. Repair or replace the harness or connector.

    NEXT 

  5. CHECK FOR DTCs (PRE-COLLISION SYSTEM) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Clear DTCs 

    2. Perform the Active Test according to the display on the Techstream.

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

      NOTE:

      Perform the Active Test for 1 second or more.

      HINT: 

      Performing the Active Test for 1 second or more causes DTC C1A4A to be stored if the DTC detection conditions are met.

      Body Electrical > Pre-Collision 2 > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      PCS Crash Alarm Buzzer Skid control buzzer assembly ON / OFF Test possible with power switch on (IG), vehicle stopped

      Body Electrical > Pre-Collision 2 > Active Test 

      Tester Display
      PCS Crash Alarm Buzzer
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Trouble Codes 

      Result

      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    Result:  1

    A 

    END 

    Result:  2

    B 

    See step  6

  6. INSPECT SKID CONTROL BUZZER ASSEMBLY (CONFIRM BUZZER OPERATION) 
    1. Turn the power switch on (IG).
    2. Check if the skid control buzzer assembly is sounding.

      Result

      Result Proceed to
      The skid control buzzer assembly does not sound when the power switch is on (IG) A
      The skid control buzzer assembly sounds continuously when the power switch is on (IG) B

    Result:  2

    B 

    See step  8

    Result:  1

    A 

    See step  7

  7. INSPECT SKID CONTROL BUZZER ASSEMBLY (UNIT INSPECTION) 
    1. Remove the skid control buzzer assembly.

      Refer to REMOVAL [11/2016 - ]

    2. Inspect the skid control buzzer assembly.

      Refer to INSPECTION [11/2016 - ]

      Result

      Result Proceed to
      Skid control buzzer assembly is abnormal A
      Skid control buzzer assembly is normal B

    Result:  2

    B 

    See step  9

    Result:  1

    A 

    See step  8

  8. REPLACE SKID CONTROL BUZZER ASSEMBLY 
    1. Replace the skid control buzzer assembly.

      Refer to REMOVAL [11/2016 - ]

    NEXT 

  9. CHECK FOR DTCs (PRE-COLLISION SYSTEM) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Clear DTCs 

    2. Perform the Active Test according to the display on the Techstream.

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

      NOTE:

      Perform the Active Test for 1 second or more.

      HINT: 

      Performing the Active Test for 1 second or more causes DTC C1A4A to be stored if the DTC detection conditions are met.

      Body Electrical > Pre-Collision 2 > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      PCS Crash Alarm Buzzer Skid control buzzer assembly ON / OFF Test possible with power switch on (IG), vehicle stopped

      Body Electrical > Pre-Collision 2 > Active Test 

      Tester Display
      PCS Crash Alarm Buzzer
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Pre-Collision 2 > Trouble Codes 

      Result

      Result Proceed to
      DTC C1A4A is not output A
      DTC C1A4A is output B

    Result:  1

    A 

    END 

    Result:  2

    B 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  COMPONENTS [02/2014 - ] 

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