LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2020 >> Mirai >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Meter / Gauge System - Diagnostic Codes & Symptom Tests >> Meter / Gauge System >> Speed Signal Circuit [01/2018 - ] >> Procedure

Speed Signal Circuit [01/2018 - ]: Procedure

  1. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY 
    1. Disconnect the combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the G55 DCM (telematics transceiver) connector.
    4. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    5. Disconnect the G32 windshield wiper relay assembly connector.
    6. Disconnect the G76 vehicle approaching speaker controller connector.
    7. Disconnect the G113 navigation ECU connector.
    8. Measure the voltage according to the value(s) in the table below.
      GTY545965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Combination Meter Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G13-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  2

  2. CHECK WINDSHIELD WIPER RELAY ASSEMBLY 
    1. Reconnect the G32 windshield wiper relay assembly connector.
    2. Disconnect the combination meter assembly connector.
    3. Disconnect the G111 radio and display receiver assembly connector.
    4. Disconnect the P49 stereo component amplifier assembly connector.
    5. Disconnect the G55 DCM (telematics transceiver) connector.
    6. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the voltage according to the value(s) in the table below.
      GTY545965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Combination Meter Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G13-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  3

  3. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Reconnect the G111 radio and display receiver assembly connector.
    2. Disconnect the combination meter assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the voltage according to the value(s) in the table below.
      GTY545965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Combination Meter Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G13-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  4

  4. CHECK DCM (TELEMATICS TRANSCEIVER) 
    1. Reconnect the G55 DCM (telematics transceiver) connector.
    2. Disconnect the combination meter assembly connector.
    3. Disconnect the G111 radio and display receiver assembly connector.
    4. Disconnect the P49 stereo component amplifier assembly connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the voltage according to the value(s) in the table below.
      GTY545965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Combination Meter Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G13-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  5

  5. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Reconnect the G41 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the combination meter assembly connector.
    3. Disconnect the G111 radio and display receiver assembly connector.
    4. Disconnect the P49 stereo component amplifier assembly connector.
    5. Disconnect the G55 DCM (telematics transceiver) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the voltage according to the value(s) in the table below.
      GTY545965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Combination Meter Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G13-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  6

  6. CHECK VEHICLE APPROACHING SPEAKER CONTROLLER 
    1. Reconnect the G76 vehicle approaching speaker controller connector.
    2. Disconnect the combination meter assembly connector.
    3. Disconnect the G111 radio and display receiver assembly connector.
    4. Disconnect the P49 stereo component amplifier assembly connector.
    5. Disconnect the G55 DCM (telematics transceiver) connector.
    6. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    7. Disconnect the G32 windshield wiper relay assembly connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the voltage according to the value(s) in the table below.
      GTY545965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Combination Meter Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G13-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  7

  7. CHECK NAVIGATION ECU 
    1. Reconnect the G113 navigation ECU connector.
    2. Disconnect the combination meter assembly connector.
    3. Disconnect the G111 radio and display receiver assembly connector.
    4. Disconnect the P49 stereo component amplifier assembly connector.
    5. Disconnect the G55 DCM (telematics transceiver) connector.
    6. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    7. Disconnect the G32 windshield wiper relay assembly connector.
    8. Disconnect the G76 vehicle approaching speaker controller connector.
    9. Measure the voltage according to the value(s) in the table below.
      GTY545965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Combination Meter Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G13-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  8

  8. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    1. Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.
      GTY560606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Booster with Master Cylinder Assembly [Skid Control ECU])
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A63-11 (SP1) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  17

    Result: 

    OK 

    See step  9

  9. CHECK COMBINATION METER ASSEMBLY (INPUT WAVEFORM) 
    1. Remove the combination meter assembly with the connector(s) connected.
      GTY564254Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Combination Meter Assembly)
      *b Waveform
    2. Connect an oscilloscope to terminal G13-20 (SI) and the body ground.
    3. Check the signal waveform according to the condition(s) in the table below.
      MEASUREMENT CONDITION

      Item Condition
      Tester Connection G13-20 (SI) - Body ground
      Tool Setting 5 V/DIV., 20 ms./DIV.
      Vehicle Condition Driving at approximately 20 km/h (12 mph)

      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.

      OK

      The waveform displayed is as shown in the illustration.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU). Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

  10. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G13-19 (+S) - P49-11 (SPD) Always Below 1 Ω
      G13-19 (+S) or P49-11 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - WINDSHIELD WIPER RELAY ASSEMBLY) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G13-19 (+S) - G32-24 (SPD) Always Below 1 Ω
      G13-19 (+S) or G32-24 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY. Refer to  REMOVAL [06/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G13-19 (+S) - G111-27 (SPD) Always Below 1 Ω
      G13-19 (+S) or G111-27 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [01/2018 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER]) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G13-19 (+S) - G55-10 (SPDP) Always Below 1 Ω
      G13-19 (+S) or G55-10 (SPDP) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [01/2018 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY]) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G13-19 (+S) - G41-5 (SPD) Always Below 1 Ω
      G13-19 (+S) or G41-5 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - VEHICLE APPROACHING SPEAKER CONTROLLER) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G13-19 (+S) - G76-6 (SPD) Always Below 1 Ω
      G13-19 (+S) or G76-6 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NAVIGATION ECU) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the G111 radio and display receiver assembly connector.
    3. Disconnect the P49 stereo component amplifier assembly connector.
    4. Disconnect the G55 DCM (telematics transceiver) connector.
    5. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
    6. Disconnect the G32 windshield wiper relay assembly connector.
    7. Disconnect the G76 vehicle approaching speaker controller connector.
    8. Disconnect the G113 navigation ECU connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G13-19 (+S) - G113-9 (SPD) Always Below 1 Ω
      G13-19 (+S) or G113-9 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NAVIGATION ECU. Refer to  REMOVAL [01/2018 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY [SKID CONTROL ECU]) 
    1. Disconnect the G13 combination meter assembly connector.
    2. Disconnect the A63 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
      G13-20 (SI) - A63-11 (SP1) Always Below 1 Ω
      G13-20 (SI) or A63-11 (SP1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals