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Home >> Toyota >> 2017 >> Prius Prime Advanced >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge / Display - Diagnostic Codes & Symptom Tests >> Meter / Gauge System >> Circuit Tests >> Speed Signal Circuit [05/2019 - 07/2020] >> Procedure

Speed Signal Circuit [05/2019 - 07/2020]: Procedure

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    GTY730974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Combination Meter Assembly (Meter Circuit Plate))
    1. Disconnect the I6 combination meter assembly (meter circuit plate) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      HINT: 

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. INSPECT COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE) (OUTPUT VOLTAGE) 
    GTY688155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
    1. Connect the I6 combination meter assembly (meter circuit plate) connector.
    2. Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A32-11 (SP1) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. INSPECT SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) (INPUT WAVEFORM) 
    GTY707066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly (Meter Circuit Plate))
    1. Check the input waveform.
      1. Connect the A32 skid control ECU (brake booster with master cylinder assembly) connector.
      2. Remove the combination meter assembly (meter circuit plate) with the connector(s) still connected.
      3. Connect an oscilloscope to terminal I6-20 (SI) and body ground.
      4. Turn the power switch on (IG).
      5. Turn a wheel slowly.
      6. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Tester Connection I6-20 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Power switch on (IG), 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 (METER CIRCUIT PLATE). Refer to  DISASSEMBLY [09/2016 - ] 

    Result: 

    NG 

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY). Refer to  REMOVAL [09/2016 - 07/2020] 

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE)) 
    1. Disconnect the I6 combination meter assembly (meter circuit plate) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A32-11 (SP1) - I6-20 (SI) Always Below 1 Ω
      A32-11 (SP1) or I6-20 (SI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE). Refer to  DISASSEMBLY [09/2016 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

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

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE)) 
    1. Disconnect the I1 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the I38 DCM (telematics transceiver)*1 connector.
    3. Disconnect the I33 navigation receiver assembly connector.
    4. Disconnect the I112 stereo component amplifier assembly*2 connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I1-19 (SPD), I38-10 (SPDP)*1, I33-17 (SPD), I112-11 (SPD)*2 or I6-19 (+S) - Body ground Always 10 kΩ or higher
      1. *1: w/ Manual (SOS) Switch
      2. *2: for 10 Speakers

      Result

      Result Proceed to
      OK (w/ Manual (SOS) Switch) A
      OK (w/o Manual (SOS) Switch) B
      NG C

    Result: 

    B 

    See step  10

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  7

  7. INSPECT DCM (TELEMATICS TRANSCEIVER) (SHORT CIRCUIT IN DCM (TELEMATICS TRANSCEIVER)) 
    1. Connect the I1 certification ECU (smart key ECU assembly) connector.
    2. Connect the I33 navigation receiver assembly connector.
    3. Connect the I112 stereo component amplifier assembly* connector.
      1. *: for 10 Speakers
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I38-10 (SPDP) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [05/2019 - 07/2020] 

    Result: 

    NG 

    See step  8

  8. INSPECT NAVIGATION RECEIVER ASSEMBLY (SHORT CIRCUIT IN NAVIGATION RECEIVER ASSEMBLY) 
    1. Disconnect the I33 navigation receiver assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I33-17 (SPD), I38-10 (SPDP) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Result Proceed to
      OK A
      NG (for 10 Speakers) B
      NG (except 10 Speakers) C

    Result: 

    A 

    REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL [05/2019 - 07/2020] 

    Result: 

    C 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2016 - 07/2020] 

    Result: 

    B 

    See step  9

  9. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (SHORT CIRCUIT IN STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the I112 stereo component amplifier assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I112-11 (SPD), I38-10 (SPDP) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [05/2019 - 07/2020] 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2016 - 07/2020] 

  10. INSPECT NAVIGATION RECEIVER ASSEMBLY (SHORT CIRCUIT IN NAVIGATION RECEIVER ASSEMBLY) 
    1. Connect the I1 certification ECU (smart key ECU assembly) connector.
    2. Connect the I112 stereo component amplifier assembly* connector.
      1. *: for 10 Speakers
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I33-17 (SPD) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Result Proceed to
      OK A
      NG (for 10 Speakers) B
      NG (except 10 Speakers) C

    Result: 

    A 

    REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL [05/2019 - 07/2020] 

    Result: 

    C 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2016 - 07/2020] 

    Result: 

    B 

    See step  11

  11. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (SHORT CIRCUIT IN STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the I112 stereo component amplifier assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I112-11 (SPD), I33-17 (SPD) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [05/2019 - 07/2020] 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2016 - 07/2020] 

  12. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE)) 
    1. Disconnect the I1 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the I38 DCM (telematics transceiver)* connector.
    3. Disconnect the I105 radio and display receiver assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I1-19 (SPD), I38-10 (SPDP)*, I105-27 (SPD) or I6-19 (+S) - Body ground Always 10 kΩ or higher
      1. *: w/ Manual (SOS) Switch

      Result

      Result Proceed to
      OK (w/ Manual (SOS) Switch) A
      OK (w/o Manual (SOS) Switch) B
      NG C

    Result: 

    B 

    See step  15

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  13

  13. INSPECT DCM (TELEMATICS TRANSCEIVER) (SHORT CIRCUIT IN DCM (TELEMATICS TRANSCEIVER)) 
    1. Connect the I1 certification ECU (smart key ECU assembly) connector.
    2. Connect the I105 radio and display receiver assembly connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I38-10 (SPDP) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [05/2019 - 07/2020] 

    Result: 

    NG 

    See step  14

  14. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (SHORT CIRCUIT IN RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Disconnect the I105 radio and display receiver assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I105-27 (SPD), I38-10 (SPDP) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [05/2019 - ] 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2016 - 07/2020] 

  15. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (SHORT CIRCUIT IN RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Connect the I1 certification ECU (smart key ECU assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I105-27 (SPD) or I6-19 (+S) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [05/2019 - ] 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2016 - 07/2020] 

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