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Speaker Circuit [09/2019 - 04/2020]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 Toyota GR Corolla, 2023 Toyota Corolla, 2022 Toyota Corolla, 2021 Toyota Corolla, and 2020 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for Hatchback Model A
      for Sedan Model B

    Result: 

    B 

    See step  19

    Result: 

    A 

    See step  2

  2. CHECK MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/o Stereo Component Amplifier Assembly A
      w/ Stereo Component Amplifier Assembly B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  3

  3. CHECK SPEAKER (OPERATION CHECK) 
    1. Enter the "System Check Mode" screen. Refer to Check Speaker in Operation Check.
      GTY452678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to OPERATION CHECK [09/2019 - 04/2020]

    2. Perform the operation check above and determine the speaker that is not operating.

      Result

      Not Operating Speaker Proceed to
      Front No. 1 speaker assembly or front No. 2 speaker assembly A
      Rear speaker assembly B

      HINT: 

      If sound cannot be heard from any speaker, inspect all of them.

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the I71 radio and display receiver assembly connector.
    2. Disconnect the K1 and L1 front No. 1 speaker assembly connectors.
    3. Disconnect the I76 and I77 front No. 2 speaker assembly connectors.
    4. Disconnect the I144 DCM (telematics transceiver) connector.
    5. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I71-1 (FR+) - I144-1 (SPI+) Always Below 1 Ω
      I71-6 (FR-) - I144-2 (SPI-) Always Below 1 Ω
      I144-3 (SPO+) - I76-4 (TWR+) Always Below 1 Ω
      I144-4 (SPO-) - I76-2 (TWR-) Always Below 1 Ω
      I71-2 (FL+) - I77-4 (TWL+) Always Below 1 Ω
      I71-7 (FL-) - I77-2 (TWL-) Always Below 1 Ω
      K1-2 - I76-3 (+) Always Below 1 Ω
      K1-1 - I76-1 (-) Always Below 1 Ω
      L1-2 - I77-3 (+) Always Below 1 Ω
      L1-1 - I77-1 (-) Always Below 1 Ω
      I71-1 (FR+) or I144-1 (SPI+) - Body ground Always 10 kΩ or higher
      I71-6 (FR-) or I144-2 (SPI-) - Body ground Always 10 kΩ or higher
      I144-3 (SPO+) or I76-4 (TWR+) - Body ground Always 10 kΩ or higher
      I144-4 (SPO-) or I76-2 (TWR-) - Body ground Always 10 kΩ or higher
      I71-2 (FL+) or I77-4 (TWL+) - Body ground Always 10 kΩ or higher
      I71-7 (FL-) or I77-2 (TWL-) - Body ground Always 10 kΩ or higher
      K1-2 or I76-3 (+) - Body ground Always 10 kΩ or higher
      K1-1 or I76-1 (-) - Body ground Always 10 kΩ or higher
      L1-2 or I77-3 (+) - Body ground Always 10 kΩ or higher
      L1-1 or I77-1 (-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY 
    1. Remove the front No. 1 speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the front No. 1 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    OK 

    See step  6

  6. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Remove the DCM (telematics transceiver).

      Refer to REMOVAL [09/2019 - 04/2020]

    2. Measure the resistance according to the value(s) in the table below.
      GTY843494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (SPI+) - 3 (SPO+) Always Below 1 Ω
      2 (SPI-) - 4 (SPO-) Always Below 1 Ω
      1 (SPI+) - 2 (SPI-) Always 10 kΩ or higher
      3 (SPO+) - 4 (SPO-) Always 10 kΩ or higher
      1 (SPI+) or 3 (SPO+) - Body ground Always 10 kΩ or higher
      2 (SPI-) or 4 (SPO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2019 - 04/2020] 

    Result: 

    OK 

    See step  7

  7. REPLACE FRONT NO. 2 SPEAKER ASSEMBLY 
    1. Remove the front No. 2 speaker assembly.

      Refer to REMOVAL [01/2019 - ]

    2. Inspect the front No. 2 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      OK

      Malfunction disappears.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

  8. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - REAR SPEAKER ASSEMBLY) 
    1. Disconnect the I71 radio and display receiver assembly connector.
    2. Disconnect the M4 and N4 rear speaker assembly connectors.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I71-4 (RR+) - M4-2 Always Below 1 Ω
      I71-9 (RR-) - M4-1 Always Below 1 Ω
      I71-3 (RL+) - N4-2 Always Below 1 Ω
      I71-8 (RL-) - N4-1 Always Below 1 Ω
      I71-4 (RR+) or M4-2 - Body ground Always 10 kΩ or higher
      I71-9 (RR-) or M4-1 - Body ground Always 10 kΩ or higher
      I71-3 (RL+) or N4-2 - Body ground Always 10 kΩ or higher
      I71-8 (RL-) or N4-1 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. REPLACE REAR SPEAKER ASSEMBLY 
    1. Remove the rear speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the rear speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      OK

      Malfunction disappears.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

  10. CHECK SPEAKER (OPERATION CHECK) 
    1. Enter the "System Check Mode" screen. Refer to Check Speaker in Operation Check.
      GTY452678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to OPERATION CHECK [09/2019 - 04/2020]

    2. Perform the operation check above and determine the speaker that is not operating.

      Result

      Not Operating Speaker Proceed to
      Front No. 1 speaker assembly or front No. 3 speaker assembly A
      Front No. 2 speaker assembly B
      Rear speaker assembly C

      HINT: 

      If sound cannot be heard from any speaker, inspect all of them.

    Result: 

    B 

    See step  14

    Result: 

    C 

    See step  17

    Result: 

    A 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY - FRONT NO. 3 SPEAKER ASSEMBLY) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the K1 and L1 front No. 1 speaker assembly connectors.
    3. Disconnect the I74 and I75 front No. 3 speaker assembly connectors.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-15 (FR+) - I74-4 (+TW) Always Below 1 Ω
      I54-30 (FR-) - I74-2 (-TW) Always Below 1 Ω
      I54-13 (FL+) - I75-4 (+TW) Always Below 1 Ω
      I54-28 (FL-) - I75-2 (-TW) Always Below 1 Ω
      K1-2 - I74-3 (+) Always Below 1 Ω
      K1-1 - I74-1 (-) Always Below 1 Ω
      L1-2 - I75-3 (+) Always Below 1 Ω
      L1-1 - I75-1 (-) Always Below 1 Ω
      I54-15 (FR+) or I74-4 (+TW) - Body ground Always 10 kΩ or higher
      I54-30 (FR-) or I74-2 (-TW) - Body ground Always 10 kΩ or higher
      I54-13 (FL+) or I75-4 (+TW) - Body ground Always 10 kΩ or higher
      I54-28 (FL-) or I75-2 (-TW) - Body ground Always 10 kΩ or higher
      K1-2 or I74-3 (+) - Body ground Always 10 kΩ or higher
      K1-1 or I74-1 (-) - Body ground Always 10 kΩ or higher
      L1-2 or I75-3 (+) - Body ground Always 10 kΩ or higher
      L1-1 or I75-1 (-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY 
    1. Remove the front No. 1 speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the front No. 1 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    OK 

    See step  13

  13. REPLACE FRONT NO. 3 SPEAKER ASSEMBLY 
    1. Remove the front No. 3 speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the front No. 3 speaker assembly.

      Refer to INSPECTION [06/2018 - ]

      OK

      Malfunction disappears.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

  14. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the I6 and I7 front No. 2 speaker assembly connectors.
    3. Disconnect the I144 DCM (telematics transceiver) connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-14 (TWR+) - I144-1 (SPI+) Always Below 1 Ω
      I54-29 (TWR-) - I144-2 (SPI-) Always Below 1 Ω
      I144-3 (SPO+) - I6-2 Always Below 1 Ω
      I144-4 (SPO-) - I6-1 Always Below 1 Ω
      I54-12 (TWL+) - I7-2 Always Below 1 Ω
      I54-27 (TWL-) - I7-1 Always Below 1 Ω
      I54-14 (TWR+) or I144-1 (SPI+) - Body ground Always 10 kΩ or higher
      I54-29 (TWR-) or I144-2 (SPI-) - Body ground Always 10 kΩ or higher
      I144-3 (SPO+) or I6-2 - Body ground Always 10 kΩ or higher
      I144-4 (SPO-) or I6-1 - Body ground Always 10 kΩ or higher
      I54-12 (TWL+) or I7-2 - Body ground Always 10 kΩ or higher
      I54-27 (TWL-) or I7-1 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY 
    1. Remove the front No. 2 speaker assembly.

      Refer to REMOVAL [01/2019 - ]

    2. Inspect the front No. 2 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT NO. 2 SPEAKER ASSEMBLY. Refer to  REMOVAL [01/2019 - ] 

    Result: 

    OK 

    See step  16

  16. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Remove the DCM (telematics transceiver).

      Refer to REMOVAL [09/2019 - 04/2020]

    2. Measure the resistance according to the value(s) in the table below.
      GTY843494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (SPI+) - 3 (SPO+) Always Below 1 Ω
      2 (SPI-) - 4 (SPO-) Always Below 1 Ω
      1 (SPI+) - 2 (SPI-) Always 10 kΩ or higher
      3 (SPO+) - 4 (SPO-) Always 10 kΩ or higher
      1 (SPI+) or 3 (SPO+) - Body ground Always 10 kΩ or higher
      2 (SPI-) or 4 (SPO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2019 - 04/2020] 

  17. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - REAR SPEAKER ASSEMBLY) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the M4 and N4 rear speaker assembly connectors.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-11 (RR+) - M4-2 Always Below 1 Ω
      I54-26 (RR-) - M4-1 Always Below 1 Ω
      I54-9 (RL+) - N4-2 Always Below 1 Ω
      I54-24 (RL-) - N4-1 Always Below 1 Ω
      I54-11 (RR+) or M4-2 - Body ground Always 10 kΩ or higher
      I54-26 (RR-) or M4-1 - Body ground Always 10 kΩ or higher
      I54-9 (RL+) or N4-2 - Body ground Always 10 kΩ or higher
      I54-24 (RL-) or N4-1 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  18

  18. REPLACE REAR SPEAKER ASSEMBLY 
    1. Remove the rear speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the rear speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      OK

      Malfunction disappears.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

  19. CHECK MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/o Stereo Component Amplifier Assembly A
      w/ Stereo Component Amplifier Assembly B

    Result: 

    B 

    See step  28

    Result: 

    A 

    See step  20

  20. CHECK SPEAKER (OPERATION CHECK) 
    1. Enter the "System Check Mode" screen. Refer to Check Speaker in Operation Check.
      GTY452678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to OPERATION CHECK [09/2019 - 04/2020]

    2. Perform the operation check above and determine the speaker that is not operating.

      Result

      Not Operating Speaker Proceed to
      Front No. 1 speaker assembly or front No. 2 speaker assembly
      (w/o Manual (SOS) Switch)      		 A
      Front No. 1 speaker assembly or front No. 2 speaker assembly
      (w/ Manual (SOS) Switch)      		 B
      Rear speaker assembly C

      HINT: 

      If sound cannot be heard from any speaker, inspect all of them.

    Result: 

    B 

    See step  22

    Result: 

    C 

    See step  26

    Result: 

    A 

    See step  21

  21. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY) 
    1. Disconnect the I71 radio and display receiver assembly connector.
    2. Disconnect the K1 and L1 front No. 1 speaker assembly connectors.
    3. Disconnect the I76 and I77 front No. 2 speaker assembly connectors.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I71-1 (FR+) - I76-4 (TWR+) Always Below 1 Ω
      I71-6 (FR-) - I76-2 (TWR-) Always Below 1 Ω
      I71-2 (FL+) - I77-4 (TWL+) Always Below 1 Ω
      I71-7 (FL-) - I77-2 (TWL-) Always Below 1 Ω
      K1-2 - I76-3 (+) Always Below 1 Ω
      K1-1 - I76-1 (-) Always Below 1 Ω
      L1-2 - I77-3 (+) Always Below 1 Ω
      L1-1 - I77-1 (-) Always Below 1 Ω
      I71-1 (FR+) or I76-4 (TWR+) - Body ground Always 10 kΩ or higher
      I71-6 (FR-) or I76-2 (TWR-) - Body ground Always 10 kΩ or higher
      I71-2 (FL+) or I77-4 (TWL+) - Body ground Always 10 kΩ or higher
      I71-7 (FL-) or I77-2 (TWL-) - Body ground Always 10 kΩ or higher
      K1-2 or I76-3 (+) - Body ground Always 10 kΩ or higher
      K1-1 or I76-1 (-) - Body ground Always 10 kΩ or higher
      L1-2 or I77-3 (+) - Body ground Always 10 kΩ or higher
      L1-1 or I77-1 (-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  24

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  22. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER) - FRONT NO. 1 SPEAKER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY) 
    1. Disconnect the I71 radio and display receiver assembly connector.
    2. Disconnect the K1 and L1 front No. 1 speaker assembly connectors.
    3. Disconnect the I76 and I77 front No. 2 speaker assembly connectors.
    4. Disconnect the I72 DCM (telematics transceiver) connector.
    5. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I71-1 (FR+) - I72-2 (SPI+) Always Below 1 Ω
      I71-6 (FR-) - I72-3 (SPI-) Always Below 1 Ω
      I72-5 (SPO+) - I76-4 (TWR+) Always Below 1 Ω
      I72-6 (SPO-) - I76-2 (TWR-) Always Below 1 Ω
      I71-2 (FL+) - I77-4 (TWL+) Always Below 1 Ω
      I71-7 (FL-) - I77-2 (TWL-) Always Below 1 Ω
      K1-2 - I76-3 (+) Always Below 1 Ω
      K1-1 - I76-1 (-) Always Below 1 Ω
      L1-2 - I77-3 (+) Always Below 1 Ω
      L1-1 - I77-1 (-) Always Below 1 Ω
      I71-1 (FR+) or I72-2 (SPI+) - Body ground Always 10 kΩ or higher
      I71-6 (FR-) or I72-3 (SPI-) - Body ground Always 10 kΩ or higher
      I71-2 (FL+) or I77-4 (TWL+) - Body ground Always 10 kΩ or higher
      I71-7 (FL-) or I77-2 (TWL-) - Body ground Always 10 kΩ or higher
      I72-5 (SPO+) or I76-4 (TWR+) - Body ground Always 10 kΩ or higher
      I72-6 (SPO-) or I76-2 (TWR-) - Body ground Always 10 kΩ or higher
      K1-2 or I76-3 (+) - Body ground Always 10 kΩ or higher
      K1-1 or I76-1 (-) - Body ground Always 10 kΩ or higher
      L1-2 or I77-3 (+) - Body ground Always 10 kΩ or higher
      L1-1 or I77-1 (-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  23

  23. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Remove the DCM (telematics transceiver).

      Refer to REMOVAL [09/2019 - 04/2020]

    2. Measure the resistance according to the value(s) in the table below.
      GTY450683Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (SPI+) - 5 (SPO+) Always Below 1 Ω
      3 (SPI-) - 6 (SPO-) Always Below 1 Ω
      2 (SPI+) - 3 (SPI-) Always 10 kΩ or higher
      5 (SPO+) - 6 (SPO-) Always 10 kΩ or higher
      2 (SPI+) or 5 (SPO+) - Body ground Always 10 kΩ or higher
      3 (SPI-) or 6 (SPO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2019 - 04/2020] 

    Result: 

    OK 

    See step  24

  24. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY 
    1. Remove the front No. 1 speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the front No. 1 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    OK 

    See step  25

  25. REPLACE FRONT NO. 2 SPEAKER ASSEMBLY 
    1. Remove the front No. 2 speaker assembly.

      Refer to REMOVAL [01/2019 - ]

    2. Inspect the front No. 2 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      OK

      Malfunction disappears.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

  26. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - REAR SPEAKER ASSEMBLY) 
    1. Disconnect the I71 radio and display receiver assembly connector.
    2. Disconnect the N4 and M4 rear speaker assembly connectors.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I71-4 (RR+) - M4-2 Always Below 1 Ω
      I71-9 (RR-) - M4-1 Always Below 1 Ω
      I71-3 (RL+) - N4-2 Always Below 1 Ω
      I71-8 (RL-) - N4-1 Always Below 1 Ω
      I71-4 (RR+) or M4-2 - Body ground Always 10 kΩ or higher
      I71-9 (RR-) or M4-1 - Body ground Always 10 kΩ or higher
      I71-3 (RL+) or N4-2 - Body ground Always 10 kΩ or higher
      I71-8 (RL-) or N4-1 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  27

  27. INSPECT REAR SPEAKER ASSEMBLY 
    1. Remove the rear speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the rear speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

    Result: 

    NG 

    REPLACE REAR SPEAKER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

  28. CHECK SPEAKER (OPERATION CHECK) 
    1. Enter the "System Check Mode" screen. Refer to Check Speaker in Operation Check.
      GTY452678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to OPERATION CHECK [09/2019 - 04/2020]

    2. Perform the operation check above and determine the speaker that is not operating.

      Result

      Not Operating Speaker Proceed to
      Front No. 1 speaker assembly or front No. 3 speaker assembly A
      Front No. 2 speaker assembly
      (w/ Manual (SOS) Switch)      		 B
      Front No. 2 speaker assembly
      (w/o Manual (SOS) Switch)      		 C
      Rear speaker assembly D
      Rear No. 2 Speaker Assembly E

      HINT: 

      If sound cannot be heard from any speaker, inspect all of them.

    Result: 

    B 

    See step  32

    Result: 

    C 

    See step  35

    Result: 

    D 

    See step  37

    Result: 

    E 

    See step  39

    Result: 

    A 

    See step  29

  29. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY - FRONT NO. 3 SPEAKER ASSEMBLY) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the K1 and L1 front No. 1 speaker assembly connectors.
    3. Disconnect the I74 and I75 front No. 3 speaker assembly connectors.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-15 (FR+) - I74-4 (+TW) Always Below 1 Ω
      I54-30 (FR-) - I74-2 (-TW) Always Below 1 Ω
      I54-13 (FL+) - I75-4 (+TW) Always Below 1 Ω
      I54-28 (FL-) - I75-2 (-TW) Always Below 1 Ω
      K1-2 - I74-3 (+) Always Below 1 Ω
      K1-1 - I74-1 (-) Always Below 1 Ω
      L1-2 - I75-3 (+) Always Below 1 Ω
      L1-1 - I75-1 (-) Always Below 1 Ω
      I54-15 (FR+) or I74-4 (+TW) - Body ground Always 10 kΩ or higher
      I54-30 (FR-) or I74-2 (-TW) - Body ground Always 10 kΩ or higher
      I54-13 (FL+) or I75-4 (+TW) - Body ground Always 10 kΩ or higher
      I54-28 (FL-) or I75-2 (-TW) - Body ground Always 10 kΩ or higher
      K1-2 or I74-3 (+) - Body ground Always 10 kΩ or higher
      K1-1 or I74-1 (-) - Body ground Always 10 kΩ or higher
      L1-2 or I75-3 (+) - Body ground Always 10 kΩ or higher
      L1-1 or I75-1 (-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  30

  30. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY 
    1. Remove the front No. 1 speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the front No. 1 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    OK 

    See step  31

  31. REPLACE FRONT NO. 3 SPEAKER ASSEMBLY 
    1. Remove the front No. 3 speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the front No. 3 speaker assembly.

      Refer to INSPECTION [06/2018 - ]

      OK

      Malfunction disappears.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

  32. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER) - FRONT NO. 2 SPEAKER ASSEMBLY) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the I6 and I7 front No. 2 speaker assembly connectors.
    3. Disconnect the I72 DCM (telematics transceiver) connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-14 (TWR+) - I72-2 (SPI+) Always Below 1 Ω
      I54-29 (TWR-) - I72-3 (SPI-) Always Below 1 Ω
      I72-5 (SPO+) - I6-2 Always Below 1 Ω
      I72-6 (SPO-) - I6-1 Always Below 1 Ω
      I54-12 (TWL+) - I7-2 Always Below 1 Ω
      I54-27 (TWL-) - I7-1 Always Below 1 Ω
      I54-14 (TWR+) or I72-2 (SPI+) - Body ground Always 10 kΩ or higher
      I54-29 (TWR-) or I72-3 (SPI-) - Body ground Always 10 kΩ or higher
      I54-12 (TWL+) or I7-2 - Body ground Always 10 kΩ or higher
      I54-27 (TWL-) or I7-1 - Body ground Always 10 kΩ or higher
      I72-5 (SPO+) or I6-2 - Body ground Always 10 kΩ or higher
      I72-6 (SPO-) or I6-1 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  33

  33. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY 
    1. Remove the front No. 2 speaker assembly.

      Refer to REMOVAL [01/2019 - ]

    2. Inspect the front No. 2 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT NO. 2 SPEAKER ASSEMBLY. Refer to  REMOVAL [01/2019 - ] 

    Result: 

    OK 

    See step  34

  34. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Remove the DCM (telematics transceiver).

      Refer to REMOVAL [09/2019 - 04/2020]

    2. Measure the resistance according to the value(s) in the table below.
      GTY450683Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (SPI+) - 5 (SPO+) Always Below 1 Ω
      3 (SPI-) - 6 (SPO-) Always Below 1 Ω
      2 (SPI+) - 3 (SPI-) Always 10 kΩ or higher
      5 (SPO+) - 6 (SPO-) Always 10 kΩ or higher
      2 (SPI+) or 5 (SPO+) - Body ground Always 10 kΩ or higher
      3 (SPI-) or 6 (SPO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2019 - 04/2020] 

  35. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the I6 and I7 front No. 2 speaker assembly connectors.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-14 (TWR+) - I6-2 Always Below 1 Ω
      I54-29 (TWR-) - I6-1 Always Below 1 Ω
      I54-12 (TWL+) - I7-2 Always Below 1 Ω
      I54-27 (TWL-) - I7-1 Always Below 1 Ω
      I54-14 (TWR+) or I6-2 - Body ground Always 10 kΩ or higher
      I54-29 (TWR-) or I6-1 - Body ground Always 10 kΩ or higher
      I54-12 (TWL+) or I7-2 - Body ground Always 10 kΩ or higher
      I54-27 (TWL-) or I7-1 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  36

  36. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY 
    1. Remove the front No. 2 speaker assembly.

      Refer to REMOVAL [01/2019 - ]

    2. Inspect the front No. 2 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

    Result: 

    NG 

    REPLACE FRONT NO. 2 SPEAKER ASSEMBLY. Refer to  REMOVAL [01/2019 - ] 

  37. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - REAR SPEAKER ASSEMBLY) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the M4 and N4 rear speaker assembly connectors.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-11 (RR+) - M4-2 Always Below 1 Ω
      I54-26 (RR-) - M4-1 Always Below 1 Ω
      I54-9 (RL+) - N4-2 Always Below 1 Ω
      I54-24 (RL-) - N4-1 Always Below 1 Ω
      I54-11 (RR+) or M4-2 - Body ground Always 10 kΩ or higher
      I54-26 (RR-) or M4-1 - Body ground Always 10 kΩ or higher
      I54-9 (RL+) or N4-2 - Body ground Always 10 kΩ or higher
      I54-24 (RL-) or N4-1 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  38

  38. INSPECT REAR SPEAKER ASSEMBLY 
    1. Remove the rear speaker assembly.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the rear speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

    Result: 

    NG 

    REPLACE REAR SPEAKER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

  39. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - REAR NO. 2 SPEAKER ASSEMBLY) 
    1. Disconnect the I54 stereo component amplifier assembly connector.
    2. Disconnect the O71 rear No. 2 speaker assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I54-10 (WF1+) - O71-4 (WF1+) Always Below 1 Ω
      I54-25 (WF1-) - O71-3 (WF1-) Always Below 1 Ω
      I54-8 (WF2+) - O71-2 (WF2+) Always Below 1 Ω
      I54-23 (WF2-) - O71-1 (WF2-) Always Below 1 Ω
      I54-10 (WF1+) or O71-4 (WF1+) - Body ground Always 10 kΩ or higher
      I54-25 (WF1-) or O71-3 (WF1-) - Body ground Always 10 kΩ or higher
      I54-8 (WF2+) or O71-2 (WF2+) - Body ground Always 10 kΩ or higher
      I54-23 (WF2-) or O71-1 (WF2-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  40

  40. INSPECT REAR NO. 2 SPEAKER ASSEMBLY 
    1. Remove the rear No. 2 speaker assembly.

      Refer to REMOVAL [01/2019 - 04/2020]

    2. Inspect the rear No. 2 speaker assembly.

      Refer to INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] 

    Result: 

    NG 

    REPLACE REAR NO. 2 SPEAKER ASSEMBLY. Refer to  REMOVAL [01/2019 - 04/2020] 

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