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Speed Signal Circuit [07/2015 - ]: Procedure

  1. INSPECT COMBINATION METER ASSEMBLY (INPUT VOLTAGE) 
    1. Disconnect the H14 combination meter assembly connector.
      GTY654140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H14-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Combination Meter Assembly)

      HINT: 

      If any of the ECUs specified in the wiring diagram supplies power to the combination meter assembly, the combination meter assembly will output a waveform.

    Result:  NG

    NG 

    See step  5

    Result:  OK

    OK 

    See step  2

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    1. Reconnect the H14 combination meter assembly connector.
    2. Disconnect the A24 brake booster with master cylinder assembly (skid control ECU) connector.
      GTY669870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A24-11 (SP1) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Brake Booster with Master Cylinder Assembly (Skid Control ECU))

    Result:  NG

    NG 

    See step  4

    Result:  OK

    OK 

    See step  3

  3. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) (INPUT WAVEFORM) 
    1. Check the input waveform.
      GTY642148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A24 brake booster with master cylinder assembly (skid control ECU) connector.
      2. Remove the combination meter assembly with the connector(s) still connected.
      3. Connect an oscilloscope to terminal H14-20 (SI) and body ground.
      4. Turn the power switch on (IG).
      5. Turn the wheel slowly.
      6. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Power switch on (IG), wheel being rotated
        TEXT IN ILLUSTRATION

        *a Component with harness connected
        (Combination Meter Assembly)

        OK

        The waveform is similar to that shown in the illustration.

        HINT: 

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

    Result:  OK

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [07/2015 - ]

    Result:  NG

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) 

    Refer to REMOVAL [07/2015 - ]

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU)) 
    1. Disconnect the H14 combination meter assembly connector.
    2. Disconnect the A24 brake booster with master cylinder assembly (skid control ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H14-20 (SI) - A24-11 (SP1) Always Below 1 Ω
      H14-20 (SI) - Body ground Always 10 kΩ or higher

    Result:  OK

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [07/2015 - ]

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - JUNCTION CONNECTOR) 
    1. Disconnect the H115 junction connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H14-19 (+S) - H115-21 Always Below 1 Ω
      H14-19 (+S) - Body ground Always 10 kΩ or higher

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  OK

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR) 
    1. Inspect for a short in the wire harness and connectors connected to the junction connector shown in the wiring diagram.

      HINT: 

      If voltage is not present, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.

      1. Disconnect the H114 and H115 junction connectors.
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        H114-12 - Body ground Power switch on (IG) 4.5 to 14 V
        H114-13 - Body ground Power switch on (IG) 4.5 to 14 V
        H114-14 - Body ground Power switch on (IG) 4.5 to 14 V
        H114-15 - Body ground Power switch on (IG) 4.5 to 14 V
        H115-19 - Body ground Power switch on (IG) 4.5 to 14 V
        H115-21 - Body ground Power switch on (IG) 4.5 to 14 V
        H115-22 - Body ground Power switch on (IG) 4.5 to 14 V

        Result

        Result Proceed to
        Voltage is not present in one circuit. A
        Voltage is present in all of the circuits. B

    Result:  B

    B 

    REPLACE JUNCTION CONNECTOR (INSTRUMENT PANEL WIRE) 

    Result:  A

    A 

    See step  7

  7. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in step 6.

      Result

      Tester Connection System that uses the circuit Proceed to
      H115-19 - Body ground Vehicle proximity notification system*4 A
      H114-22 - Body ground Auto wiper system*1 B
      H114-13 - Body ground Smart access system with push-button start C
      H114-15 - Body ground Navigation system*2 or Audio and visual system*3 D
      H114-14 - Body ground Navigation system*2 or Audio and visual system*3 E
      H114-12 - Body ground Safety connect system*5 E
      • *1: w/ Auto Wiper System
      • *2: w/ Navigation System
      • *3: w/o Navigation System
      • *4: w/ w/ Vehicle Proximity Notification System
      • *5: w/ Manual (SOS) Switch

    Result:  B

    B 

    See step  9

    Result:  C

    C 

    See step  10

    Result:  D

    D 

    See step  11

    Result:  E

    E 

    See step  12

    Result:  A

    A 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (VEHICLE APPROACHING SPEAKER CONTROLLER CIRCUIT) 
    1. Disconnect the H50 vehicle approaching speaker controller connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H50-6 (SPD) - Body ground Always 10 kΩ or higher

    Result:  OK

    OK 

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER 

    Refer to REMOVAL [07/2015 - ]

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY CIRCUIT) 
    1. Disconnect the H51 windshield wiper relay assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H51-24 (SPD) - Body ground Always 10 kΩ or higher

    Result:  OK

    OK 

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY 

    Refer to REMOVAL [07/2015 - ]

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) CIRCUIT) 
    1. Disconnect the H57 certification ECU (smart key ECU assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H57-27 (SPD) - Body ground Always 10 kΩ or higher

    Result:  OK

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Refer to REMOVAL [07/2015 - ]

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT) 
    1. Disconnect the H97*1, H89*2 or h1*3 radio receiver assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H97-56 (SPD)*1 - Body ground Always 10 kΩ or higher
      H89-17 (SPD)*2 - Body ground Always 10 kΩ or higher
      h1-56 (SPD)*3 - Body ground Always 10 kΩ or higher
      • *1: w/ Navigation System
      • *2: w/ Audio and Visual System (for Radio and Display Type)
      • *3: w/ Audio and Visual System (for Radio and Display Type with Digital Audio Broadcasting Function)

      Result

      Result Proceed to
      OK (w/ Navigation system) A
      OK (w/ Audio and Visual System (for Radio and A Display Type with Digital Audio Broadcasting Function))
      OK (w/ Audio and Visual System (for Radio and Display Type)) B
      NG C

    Result:  A

    A 

    REPLACE RADIO RECEIVER ASSEMBLY 

    Refer to REMOVAL [07/2015 - ]

    Result:  B

    B 

    REPLACE RADIO RECEIVER ASSEMBLY 

    Refer to REMOVAL [07/2015 - ]

    Result:  C

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in step 6.

      Result

      Tester Connection System that uses the circuit Proceed to
      H114-14 - Body ground Navigation system*1 or Audio and visual system*2 B
      H114-12 - Body ground Safety connect system*3 C
      • *1: w/ Navigation System
      • *2: w/o Navigation System
      • *3: w/ Manual (SOS) Switch

    Result:  B

    B 

    See step  14

    Result:  A

    A 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT) 
    1. Disconnect the H99*1, *3 or H87*2 stereo component amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H99-17 (SPD)*1, *3 - Body ground Always 10 kΩ or higher
      H87-11 (SPD)*2 - Body ground Always 10 kΩ or higher
      • *1: w/ Navigation System
      • *2: w/ Audio and Visual System (for Radio and Display Type)
      • *3: w/ Audio and Visual System (for Radio and Display Type with Digital Audio Broadcasting Function)

    Result:  OK

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [07/2015 - ]

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) CIRCUIT) 
    1. Disconnect the H101 DCM (telematics transceiver) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H101-10 (SPDP) - Body ground Always 10 kΩ or higher

    Result:  OK

    OK 

    REPLACE DCM (TELEMATICS TRANSCEIVER) 

    Refer to REMOVAL [07/2015 - ]

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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