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Speed Signal Circuit [08/2015 - ]: Procedure

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the L27 connector.
      GTY339156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified 0Condition
      L27-15 (+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 Sub-assembly)

      HINT: 

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

    NG → Refer to   5 

    OK: Go to next step 

  2. INSPECT COMBINATION METER SUB-ASSEMBLY (OUTPUT VOLTAGE) 
    1. Reconnect the L27 connector.
    2. Disconnect the A58 connector.
      GTY339198Courtesy 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
      A58-11 (SP1) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Skid Control ECU)

    NG → Refer to   4 

    OK: Go to next step 

  3. INSPECT SKID CONTROL ECU (INPUT WAVEFORM) 
    1. Check the input waveform.
      GTY326051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A58 connector.
      2. Remove the combination meter sub-assembly with the connector(s) still connected.
      3. Connect an oscilloscope to terminal L27-16 (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
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Wheel being rotated
        TEXT IN ILLUSTRATION

        *a Component with harness connected
        (Combination Meter Sub-assembly)

        OK

        The waveform is displayed as 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

        Result Proceed to
        OK (w/o Multi-information display) A
        OK (w/ Multi-information display) B
        NG C

    B → Refer to   28 

    C → Refer to   17 

    A → Refer to   18 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER SUB-ASSEMBLY - SKID CONTROL ECU) 
    1. Disconnect the L27 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A58-11 (SP1) - L27-16 (SI) Always Below 1 Ω
      A58-11 (SP1) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      OK (w/o Multi-information display) A
      OK (w/ Multi-information display) B
      NG C

    B → Refer to   28 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → Refer to   18 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER SUB-ASSEMBLY - JUNCTION CONNECTOR) 
    1. Disconnect the L70 junction connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L27-15 (+S) - L70-32 Always Below 1 Ω
      L27-15 (+S) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR) 
    1. Inspect for a short in the circuit that is connected to the junction block 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 L70 connector.
        GTY325596Courtesy 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
        L70-1 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-2 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-3 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-11 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-21 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-22 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-31 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-31 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-31 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-31 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-12 - Body ground Power switch on (IG) 4.5 to 14 V
        TEXT IN ILLUSTRATION

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

        Result

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

    B → REPLACE JUNCTION CONNECTOR 

    A: Go to next step 

  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
      L70-1 - Body ground Tire pressure Warning System A
      L70-2 - Body ground Safety Connect System*1 B
      L70-11 - Body ground Vehicle Proximity Notification System*2 C
      L70-22 - Body ground Hybrid Control System D
      L70-31 - Body ground Lighting System E
      L70-21 - Body ground Audio/Visual System*3 E
      L70-3 - Body ground Audio/Visual System*4 E
      L70-3 - Body ground Navigation System*5 E
      L70-12 - Body ground Auto Wiper System*6 E
      • *1: w/ Manual (SOS) switch
      • *2: w/ Vehicle proximity notification system
      • *3: for 8 speakers
      • *4: for Radio and display type
      • *5: for Navigation receiver type
      • *6: w/ Auto wiper system

    B → Refer to   9 

    C → Refer to   10 

    D → Refer to   11 

    E → Refer to   12 

    A: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT, TIRE PRESSURE WARNING ECU AND RECEIVER CIRCUIT) 
    1. Disconnect the L4*1 or R35*2 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L4-2 (SPD)*1 - Body ground Always 10 kΩ or higher
      R35-2 (SPD)*2 - Body ground Always 10 kΩ or higher
      • *1: w/ Vehicle proximity notification system
      • *2: w/o Vehicle proximity notification system

      Result

      Result Proceed to
      OK (w/ Vehicle proximity notification system) A
      OK (w/o Vehicle proximity notification system) B
      NG C

    B → Refer to   29 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → Refer to   19 

  9. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) CIRCUIT) 
    1. Disconnect the L19 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L19-10 (SPDP) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → Refer to   26 

  10. CHECK HARNESS AND CONNECTOR (VEHICLE APPROACHING SPEAKER CONTROLLER CIRCUIT) 
    1. Disconnect the L130 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L130-6 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → Refer to   23 

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT) 
    1. Disconnect the L5 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L5-14 (SPDI) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → Refer to   20 

  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
      L70-31 - Body ground Lighting System A
      L70-21 - Body ground Audio/Visual System*1 B
      L70-3 - Body ground Audio/Visual System*2 C
      L70-3 - Body ground Navigation System*3 C
      L70-12 - Body ground Auto Wiper System*4 D
      • *1: for 8 speakers
      • *2: for Radio and display type
      • *3: for Navigation receiver type
      • *4: w/ Auto wiper system

    B → Refer to   14 

    C → Refer to   15 

    D → Refer to   16 

    A: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY CIRCUIT) 
    1. Disconnect the A48 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A48-16 (SPDR) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → Refer to   25 

  14. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT) 
    1. Disconnect the L31 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L31-11 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → Refer to   22 

  15. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY CIRCUIT, RADIO AND DISPLAY RECEIVER ASSEMBLY CIRCUIT) 
    1. Disconnect the L38*1 or L35*2 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L38-17 (SPD)*1 - Body ground Always 10 kΩ or higher
      L35-17 (SPD)*2 - Body ground Always 10 kΩ or higher
      • *1: for Navigation receiver type
      • *2: for Radio and display type

      Result

      Result Proceed to
      OK (for Navigation receiver type) A
      OK (for Radio and display type) B
      NG C

    B → Refer to   24 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → Refer to   21 

  16. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY CIRCUIT) 
    1. Disconnect the L169 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L169-24 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → Refer to   27 

  17. REPLACE SKID CONTROL ECU. Refer to  REMOVAL [08/2015 - ] 
  18. REPLACE METER CIRCUIT PLATE. Refer to  DISASSEMBLY [08/2015 - ] 
  19. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL [08/2015 - ] 
  20. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL [08/2015 - ] 
  21. REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  22. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  23. REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER. Refer to  REMOVAL [08/2015 - ] 
  24. REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  25. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  26. REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [08/2015 - ] 
  27. REPLACE WINDSHIELD WIPER RELAY ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  28. REPLACE COMBINATION METER SUB-ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  29. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [08/2015 - ] 
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