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Speed Signal Circuit [12/2015 - 08/2016]: Procedure

  1. INSPECT COMBINATION METER ASSEMBLY (INPUT VOLTAGE) 
    1. Disconnect the combination meter assembly connector.
      GTY735246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D145-3 (+S) - Body ground Ignition switch ON 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 

    See step  5

    Result: 

    OK 

    See step  2

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    1. Disconnect the A4 brake actuator assembly connector.
      GTY711489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A4-11 (SP1) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. INSPECT BRAKE ACTUATOR ASSEMBLY (INPUT WAVEFORM) 
    1. Check the input waveform.
      GTY698279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the combination meter assembly with the connector(s) still connected.
      2. Connect an oscilloscope to terminal D145-4 (SI) and body ground.
      3. Turn the ignition switch to ON.
      4. Turn the wheel slowly.
      5. 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 Ignition switch ON, wheel being rotated

        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.

        TEXT IN ILLUSTRATION

        *a Component with harness connected
        (Combination Meter Assembly)

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 11/2017] )

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A4 brake actuator assembly connector.
    2. Disconnect the D145 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A4-11 (SP1) - D145-4 (SI) Always Below 1 Ω
      A4-11 (SP1) or D145-4 (SI) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the D145 combination meter assembly connector.
    2. Disconnect the 2A instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D145-3 (+S) - 2A-30 Always Below 1 Ω
      D145-3 (+S) or 2A-30 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Inspect for a short in the circuit that is connected to the instrument panel junction block assembly connector shown in the wiring diagram.

      HINT: 

      If the voltage is not as specified, 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 2A and 2F instrument panel junction block assembly connectors.
        GTY692459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        2F-13 - Body ground Ignition switch ON 4.5 to 14 V
        2F-27 - Body ground Ignition switch ON 4.5 to 14 V
        2A-29 - Body ground Ignition switch ON 4.5 to 14 V
        2A-28 - Body ground Ignition switch ON 4.5 to 14 V
        TEXT IN ILLUSTRATION

        *a Front view of wire harness connector
        (to Instrument Panel Junction Block Assembly)
        RESULT

        Result Proceed to
        Voltage is not as specified in one circuit A
        Voltage is as specified in all circuits B

    Result: 

    B 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    Result: 

    A 

    See step  7

  7. SYSTEM CHECK 
    1. Select the circuit for which voltage was not as specified in the previous step 6.
      RESULT

      Tester Connection System that Uses the Circuit Proceed to
      2F-13 - Body ground Automatic transaxle system A
      2F-27 - Body ground SFI system B
      2A-29 - Body ground Tire pressure warning system C
      2A-28 - Body ground Smart key system*1, wiper and washer system*2, separate type amplifier system*3, safety connect system*4, navigation system*5, audio and visual system*6 D
      1. *1: w/ Smart Key System
      2. *2: w/ Rain Sensor
      3. *3: for Separate Type Amplifier System
      4. *4: w/ Safety Connect System
      5. *5: for Navigation Receiver Type
      6. *6: for Radio and Display Type

    Result: 

    B 

    See step  9

    Result: 

    C 

    See step  10

    Result: 

    D 

    See step  11

    Result: 

    A 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - TCM) 
    1. Disconnect the 2F instrument panel junction block assembly connector.
    2. Disconnect the B2 TCM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2F-13 - B2-3 (SPD) Always Below 1 Ω
      2F-13 or B2-3 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE TCM 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECM) 
    1. Disconnect the 2F instrument panel junction block assembly connector.
    2. Disconnect the A39 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2F-27 - A39-13 (SPD) Always Below 1 Ω
      2F-27 or A39-13 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - TIRE PRESSURE WARNING ECU) 
    1. Disconnect the 2A instrument panel junction block assembly connector.
    2. Disconnect the D82 tire pressure warning ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2A-29 - D82-2 (SPD) Always Below 1 Ω
      2A-29 or D82-2 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE TIRE PRESSURE WARNING ECU 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - JUNCTION CONNECTOR) 
    1. Disconnect the 2A instrument panel junction block assembly connector.
    2. Disconnect the D175 junction connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2A-28 - D175-13 Always Below 1 Ω
      2A-28 or D175-13 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR) 
    1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.
      1. Disconnect the D175 junction connector.
        GTY714945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        D175-17 - Body ground*1 Ignition switch ON 4.5 to 14 V
        D175-14 - Body ground*2 Ignition switch ON 4.5 to 14 V
        D175-16 - Body ground*3 Ignition switch ON 4.5 to 14 V
        D175-15 - Body ground*4 Ignition switch ON 4.5 to 14 V
        D175-12 - Body ground Ignition switch ON 4.5 to 14 V
        1. *1: w/ Smart Key System
        2. *2: w/ Rain Sensor
        3. *3: for Separate Type Amplifier System
        4. *4: w/ Safety Connect System
        TEXT IN ILLUSTRATION

        *a Front view of wire harness connector
        (to Junction Connector)
        RESULT

        Result Proceed to
        Voltage is not as specified in one circuit A
        Voltage is as specified in all circuits B

    Result: 

    B 

    REPLACE JUNCTION CONNECTOR 

    Result: 

    A 

    See step  13

  13. SYSTEM CHECK 
    1. Select the circuit for which voltage was not as specified in the previous step 12.
      RESULT

      Tester Connection System that Uses the Circuit Proceed to
      D175-17 - Body ground*1 Smart key system A
      D175-14 - Body ground*2 Wiper and washer system B
      D175-16 - Body ground*3 Separate Type Amplifier System C
      D175-15 - Body ground*4 Safety connect system D
      D175-12 - Body ground Navigation system*5, audio and visual system*6 E
      1. *1: w/ Smart Key System
      2. *2: w/ Rain Sensor
      3. *3: for Separate Type Amplifier System
      4. *4: w/ Safety Connect System
      5. *5: for Navigation Receiver Type
      6. *6: for Radio and Display Type

    Result: 

    B 

    See step  15

    Result: 

    C 

    See step  16

    Result: 

    D 

    See step  17

    Result: 

    E 

    See step  18

    Result: 

    A 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU) 
    1. Disconnect the D175 junction connector.
    2. Disconnect the D89 power management control ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D175-17 - D89-23 (SPD) Always Below 1 Ω
      D175-17 or D89-23 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE POWER MANAGEMENT CONTROL ECU 

    (Refer to REMOVAL [12/2015 - 11/2017] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - WINDSHIELD WIPER RELAY ASSEMBLY) 
    1. Disconnect the D175 junction connector.
    2. Disconnect the D78 windshield wiper relay assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D175-14 - D78-19 (SPD) Always Below 1 Ω
      D175-14 or D78-19 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the D175 junction connector.
    2. Disconnect the L5 stereo component amplifier assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D175-16 - L5-11 (SPD) Always Below 1 Ω
      D175-16 or L5-11 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - TELEMATICS TRANSCEIVER) 
    1. Disconnect the D175 junction connector.
    2. Disconnect the D73 telematics transceiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D175-15 - D73-10 (SPDP) Always Below 1 Ω
      D175-15 or D73-10 (SPDP) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE TELEMATICS TRANSCEIVER 

    (Refer to REMOVAL [12/2015 - 11/2017] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  18. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - NAVIGATION RECEIVER ASSEMBLY OR RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. for Navigation Receiver Type
      1. Disconnect the D175 junction connector.
      2. Disconnect the D153 navigation receiver assembly connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        D175-12 - D153-17 (SPD) Always Below 1 Ω
        D175-12 or D153-17 (SPD) - Body ground Always 10 kΩ or higher
    2. for Radio and Display Type
      1. Disconnect the D175 junction connector.
      2. Disconnect the D155 radio and display receiver assembly connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        D175-12 - D155-17 (SPD) Always Below 1 Ω
        D175-12 or D155-17 (SPD) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      NG A
      OK (for Navigation Receiver Type) B
      OK (for Radio and Display Type) C

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    REPLACE NAVIGATION RECEIVER ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 11/2017] )

    Result: 

    C 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 11/2017] )

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