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Home >> Toyota >> 2021 >> RAV4 LE, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Symptom Tests (2 Of 2) & Circuit Tests >> Meter / Gauge System >> Speed Signal Circuit [12/2021 - 10/2022] >> Procedure

Speed Signal Circuit [12/2021 - 10/2022]: Procedure

  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Combination Meter Assembly)
    1. Disconnect the combination meter assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      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

      Result  Proceed to 
      OK (for Gasoline Model) A
      OK (for HV Model) B
      NG C

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  8

    Result: 

    A 

    See step  2

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    GTY873608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Brake Actuator Assembly [Skid Control ECU])
    1. Disconnect the brake actuator assembly (skid control ECU) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A39-34 (SP1) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) (INPUT WAVEFORM) 
    GTY870221Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    *b Waveform
    1. Check the input waveform.
      1. Remove the combination meter assembly with the connector(s) still connected.

        Refer to REMOVAL [11/2018 - 10/2022]

      2. Connect an oscilloscope to terminal G18-20 (SI) and body ground.
      3. Turn the ignition switch to ON.
      4. Turn a wheel slowly.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Tester connection G18-20 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        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.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) 

    Refer to REMOVAL [08/2020 - 10/2022]

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY [SKID CONTROL ECU]) 
    1. Disconnect the G18 combination meter assembly connector.
    2. Disconnect the A39 brake actuator 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
      G18-20 (SI) - A39-34 (SP1) Always Below 1 Ω
      G18-20 (SI) or A39-34 (SP1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    GTY1115005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Brake Actuator Assembly [No. 2 Skid Control ECU])
    1. Disconnect the brake actuator assembly (No. 2 skid control ECU) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A105-18 (SP1) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  6

  6. CHECK BRAKE ACTUATOR ASSEMBLY (NO. 2 SKID CONTROL ECU) (INPUT WAVEFORM) 
    GTY870221Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    *b Waveform
    1. Check the input waveform.
      1. Remove the combination meter assembly with the connector(s) still connected.

        Refer to REMOVAL [11/2018 - 10/2022]

      2. Connect an oscilloscope to terminal G18-20 (SI) and body ground.
      3. Turn the ignition switch to ON.
      4. Turn a wheel slowly.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Tester connection G18-20 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        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.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY (NO. 2 SKID CONTROL ECU) 

    Refer to REMOVAL [12/2021 - 10/2022]

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY [NO. 2 SKID CONTROL ECU]) 
    1. Disconnect the G18 combination meter assembly connector.
    2. Disconnect the A105 brake actuator assembly (No. 2 skid control ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G18-20 (SI) - A105-18 (SP1) Always Below 1 Ω
      G18-20 (SI) or A105-18 (SP1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. *1: for Gasoline Model
    2. *2: w/ Audio and Visual System
    3. *3: w/ Smart Key System
    4. *4: w/ Navigation System
    5. *5: for 9 Speakers
    1. Disconnect the combination meter assembly connector.
      GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Disconnect the A24 ECM connector.*1
    3. Disconnect the G3 radio and display receiver assembly connector.*2
    4. Disconnect the G54 certification ECU (smart key ECU assembly) connector.*3
    5. Disconnect the H7 navigation ECU connector.*4
    6. Disconnect the M3 stereo component amplifier assembly connector.*5
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G18-36 (+S) - Body ground Always 10 kΩ or higher

      Result

      Result  Proceed to 
      OK (for Gasoline Model) A
      OK (for HV Model) B
      NG C

    Result: 

    B 

    See step  17

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  9

  9. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Smart Key System A
      w/o Smart Key System B

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  10

  10. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Combination Meter Assembly)
    1. Disconnect the combination meter assembly connector.
    2. Disconnect the G54 certification ECU (smart key ECU assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the certification ECU (smart key ECU assembly).

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Refer to REMOVAL [12/2021 - 10/2022]

    Result: 

    NG 

    See step  11

  11. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Navigation System A
      w/o Navigation System B

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  12

  12. CHECK NAVIGATION ECU 
    1. Disconnect the combination meter assembly connector.
      GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Disconnect the H7 navigation ECU connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the navigation ECU.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NAVIGATION ECU 

    Refer to REMOVAL [10/2019 - 10/2022]

    Result: 

    NG 

    See step  13

  13. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Audio and Visual System A
      w/o Audio and Visual System B

    Result: 

    B 

    See step  15

    Result: 

    A 

    See step  14

  14. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Disconnect the combination meter assembly connector.
      GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Disconnect the G3 radio and display receiver assembly connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the radio and display receiver assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    NG 

    See step  15

  15. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      For 9 Speakers A
      except 9 Speakers B

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [08/2020 - 10/2022]

    Result: 

    A 

    See step  16

  16. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY 
    1. Disconnect the combination meter assembly connector.
      GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Disconnect the M3 stereo component amplifier assembly connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the stereo component amplifier assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    NG 

    REPLACE ECM 

    Refer to REMOVAL [08/2020 - 10/2022]

  17. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Audio and Visual System A
      w/o Audio and Visual System B

    Result: 

    B 

    See step  19

    Result: 

    A 

    See step  18

  18. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Disconnect the combination meter assembly connector.
      GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Disconnect the G3 radio and display receiver assembly connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the radio and display receiver assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    NG 

    See step  19

  19. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Smart Key System A
      w/o Smart Key System B

    Result: 

    B 

    See step  21

    Result: 

    A 

    See step  20

  20. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Combination Meter Assembly)
    1. Disconnect the combination meter assembly connector.
    2. Disconnect the G54 certification ECU (smart key ECU assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the certification ECU (smart key ECU assembly).

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Refer to REMOVAL [12/2021 - 10/2022]

    Result: 

    NG 

    See step  21

  21. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Navigation System A
      w/o Navigation System B

    Result: 

    B 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

    Result: 

    A 

    See step  22

  22. CHECK NAVIGATION ECU 
    1. Disconnect the combination meter assembly connector.
      GTY856826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Disconnect the H7 navigation ECU connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G18-36 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the navigation ECU.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NAVIGATION ECU 

    Refer to REMOVAL [10/2019 - 10/2022]

    Result: 

    NG 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2018 - 10/2022]

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