AUDIO AND VISUAL SYSTEM(for Radio and Display Type) Speaker Circuit

DESCRIPTION

If there is a short in a speaker circuit, the radio and display receiver assembly detects it and stops output to the speakers.

As a result, sound cannot be heard from the speakers even if there is no malfunction in the radio and display receiver assembly or speakers.

WIRING DIAGRAM

B0028CAE01
for 2 Speakers
*a Front No. 1 Speaker Assembly LH
*b Front No. 1 Speaker Assembly RH
*c Radio and Display Receiver Assembly
B00292TE01
B0024LPE09

PROCEDURE


  1. CHECK SPEAKER TYPE


    1. Check speaker type.

      Result
      Result Proceed to
      for 2 Speakers A
      for 4 Speakers B
      for 6 Speakers C

    B

    CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT) Click here

    C

    CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT)


    • *1: for LH Side

      *2: for RH Side


    1. Disconnect the G40 radio and display receiver assembly connector.

    2. Disconnect the K4*1 and/or J4*2 front No. 1 speaker assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LH Side
      Tester Connection Condition Specified Condition
      G40-2 (FL+) - K4-1 Always Below 1 Ω
      G40-6 (FL-) - K4-2 Always Below 1 Ω
      G40-2 (FL+) or K4-1 - Body ground Always 10 kΩ or higher
      G40-6 (FL-) or K4-2 - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      G40-1 (FR+) - J4-1 Always Below 1 Ω
      G40-5 (FR-) - J4-2 Always Below 1 Ω
      G40-1 (FR+) or J4-1 - Body ground Always 10 kΩ or higher
      G40-5 (FR-) or J4-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY


    1. Remove the front No. 1 speaker assembly.

      Click here

    2. Inspect the front No. 1 speaker assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT)


    • *1: for LH Side

      *2: for RH Side


    1. Disconnect the G40 and G41 radio and display receiver assembly connectors.

    2. Disconnect the K4*1 and/or J4*2 front No. 1 speaker assembly connector.

    3. Disconnect the M2*1 and/or L2*2 rear speaker assembly connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LH Side
      Tester Connection Condition Specified Condition
      G40-2 (FL+) - K4-1 Always Below 1 Ω
      G40-6 (FL-) - K4-2 Always Below 1 Ω
      G41-2 (RL+) - M2-1 Always Below 1 Ω
      G41-6 (RL-) - M2-2 Always Below 1 Ω
      G40-2 (FL+) or K4-1 - Body ground Always 10 kΩ or higher
      G40-6 (FL-) or K4-2 - Body ground Always 10 kΩ or higher
      G41-2 (RL+) or M2-1 - Body ground Always 10 kΩ or higher
      G41-6 (RL-) or M2-2 - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      G40-1 (FR+) - J4-1 Always Below 1 Ω
      G40-5 (FR-) - J4-2 Always Below 1 Ω
      G41-1 (RR+) - L2-1 Always Below 1 Ω
      G41-3 (RR-) - L2-2 Always Below 1 Ω
      G40-1 (FR+) or J4-1 - Body ground Always 10 kΩ or higher
      G40-5 (FR-) or J4-2 - Body ground Always 10 kΩ or higher
      G41-1 (RR+) or L2-1 - Body ground Always 10 kΩ or higher
      G41-3 (RR-) or L2-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY


    1. Remove the front No. 1 speaker assembly.

      Click here

    2. Inspect the front No. 1 speaker assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

    OK

  6. INSPECT REAR SPEAKER ASSEMBLY


    1. Remove the rear speaker assembly.

      for Smart Cab: Click here

      for Double Cab: Click here

    2. Inspect the rear speaker assembly.

      for Smart Cab: Click here

      for Double Cab: Click here

      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE REAR SPEAKER ASSEMBLY for Smart Cab: Click here
    REPLACE REAR SPEAKER ASSEMBLY for Double Cab: Click here

  7. CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT)


    • *1: for LH Side

      *2: for RH Side


    1. Disconnect the G40 and G41 radio and display receiver assembly connectors.

    2. Disconnect the K4*1 and/or J4*2 front No. 1 speaker assembly connector.

    3. Disconnect the K7*1 and/or J7*2 front No. 2 speaker assembly connector.

    4. Disconnect the M2*1 and/or L2*2 rear speaker assembly connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LH Side
      Tester Connection Condition Specified Condition
      G40-2 (FL+) - K7-4 (TWL+) Always Below 1 Ω
      G40-6 (FL-) - K7-2 (TWL-) Always Below 1 Ω
      K7-3 (+) - K4-1 Always Below 1 Ω
      K7-1 (-) - K4-2 Always Below 1 Ω
      G41-2 (RL+) - M2-1 Always Below 1 Ω
      G41-6 (RL-) - M2-2 Always Below 1 Ω
      G40-2 (FL+) or K7-4 (TWL+) - Body ground Always 10 kΩ or higher
      G40-6 (FL-) or K7-2 (TWL-) - Body ground Always 10 kΩ or higher
      K7-3 (+) or K4-1 - Body ground Always 10 kΩ or higher
      K7-1 (-) or K4-2 - Body ground Always 10 kΩ or higher
      G41-2 (RL+) or M2-1 - Body ground Always 10 kΩ or higher
      G41-6 (RL-) or M2-2 - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      G40-1 (FR+) - J7-4 (TWR+) Always Below 1 Ω
      G40-5 (FR-) - J7-2 (TWR-) Always Below 1 Ω
      J7-3 (+) - J4-1 Always Below 1 Ω
      J7-1 (-) - J4-2 Always Below 1 Ω
      G41-1 (RR+) - L2-1 Always Below 1 Ω
      G41-3 (RR-) - L2-2 Always Below 1 Ω
      G40-1 (FR+) or J7-4 (TWR+) - Body ground Always 10 kΩ or higher
      G40-5 (FR-) or J7-2 (TWR-) - Body ground Always 10 kΩ or higher
      J7-3 (+) or J4-1 - Body ground Always 10 kΩ or higher
      J7-1 (-) or J4-2 - Body ground Always 10 kΩ or higher
      G41-1 (RR+) or L2-1 - Body ground Always 10 kΩ or higher
      G41-3 (RR-) or L2-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY


    1. Remove the front No. 1 speaker assembly.

      Click here

    2. Inspect the front No. 1 speaker assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

    OK

  9. INSPECT REAR SPEAKER ASSEMBLY


    1. Remove the rear speaker assembly.

      Click here

    2. Inspect the rear speaker assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SPEAKER ASSEMBLY Click here

    OK

  10. CHECK FRONT NO. 2 SPEAKER ASSEMBLY


    1. Replace the front No. 2 speaker assembly.

      Click here

    2. Check the malfunction disappears.

      OK
      Malfunction disappears.

      Tech Tips


      • Connect all the connectors to the rear No. 2 speaker assemblies that were disconnected.

      • When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.

      • Perform the above inspection on both the LH and RH sides.

      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT NO. 2 SPEAKER ASSEMBLY IS DEFECTIVE)

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here