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### AUDIO AND VISUAL SYSTEM > Speaker Circuit

## for Preparation Click here

## DESCRIPTION

The radio receiver sends sound signals to the speakers.

## WIRING DIAGRAM

## INSPECTION PROCEDURE

1.CHECK VEHICLE TYPE

1. Check the vehicle type.

   Result
   Result | Proceed to
   Single cab | A
   Extra cab or Double cab | B

| A |

CHECK WIRE HARNESS (RADIO RECEIVER - FRONT NO. 1 SPEAKER)

B |

2.CHECK SPEAKER

1. Check that each speaker sounds.

   Result
   Result | Proceed to
   Front No. 1 speaker does not operate *1 | A
   Front No. 1 speaker does not operate *2 | B
   Front No. 2 speaker does not operate *2 | C
   Rear No. 1 speaker does not operate | D

   *1: w/ 4 speakers
   *2: w/ 6 speakers

| B |

Go to step 5

| C |

Go to step 8

| D |

Go to step 10

A |

3.CHECK WIRE HARNESS (RADIO RECEIVER - FRONT NO. 1 SPEAKER)

1. Disconnect the R1 receiver connector.

1. Disconnect the S15 or S16 receiver connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition
     R1-1 (FR+) - S16-1 | Below 1 Ω
     R1-5 (FR-) - S16-2 | Below 1 Ω
     R1-1 (FR+) - Body ground | 10 kΩ or higher
     R1-5 (FR-) - Body ground | 10 kΩ or higher
     R1-2 (FL+) - S15-1 | Below 1 Ω
     R1-6 (FL-) - S15-2 | Below 1 Ω
     R1-2 (FL+) - Body ground | 10 kΩ or higher
     R1-6 (FL-) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

4.INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

1. Check the front No. 1 speaker assembly (Click here).

   OK:
     Front No. 1 speaker is normal.

| NG |

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

OK |

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR DIAGNOSTIC TROUBLE CODE CHART

5.CHECK FRONT NO. 2 SPEAKER ASSEMBLY

1. Check that the front No. 2 speaker sounds.

   OK:
     Speaker sounds.

| NG |

Go to step 8

OK |

6.CHECK WIRE HARNESS (FRONT NO. 1 SPEAKER - FRONT NO. 2 SPEAKER)

1. Disconnect the S15 and T23, or S16 and T24 connectors.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition
     S15-1 - T23-3 | Below 1 Ω
     S15-1 - Body ground | 10 kΩ or higher
     S15-2 - T23-1 | Below 1 Ω
     S15-2 - Body ground | 10 kΩ or higher
     S16-1 - T24-3 | Below 1 Ω
     S16-1 - Body ground | 10 kΩ or higher
     S16-2 - T24-1 | Below 1 Ω
     S16-2 - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

7.INSPECT FRONT NO.2 SPEAKER ASSY

1. Disconnect the T23 or T24 receiver connector.

1. Measure the resistance of the speaker.

   Standard resistance:

     Tester Connection | Specified Condition
     1 - 2 | Below 1 Ω
     3 - 4 | Below 1 Ω
     1 - Body ground | 10 kΩ or higher
     3 - Body ground | 10 kΩ or higher

| NG |

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

OK |

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

8.CHECK WIRE HARNESS (RADIO RECEIVER - FRONT NO. 2 SPEAKER)

1. Disconnect the R2 receiver connector.

1. Disconnect the T23 or T24 speaker connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition
     R2-1 (FR+) - T24-4 | Below 1 Ω
     R2-5 (FR-) - T24-2 | Below 1 Ω
     R2-1 (FR+) - Body ground | 10 kΩ or higher
     R2-5 (FR-) - Body ground | 10 kΩ or higher
     R2-2 (FL+) - T23-4 | Below 1 Ω
     R2-6 (FL-) - T23-2 | Below 1 Ω
     R2-2 (FL+) - Body ground | 10 kΩ or higher
     R2-6 (FL-) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

9.INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

1. Check that the malfunction disappears when another speaker in good condition is installed.

   OK:
     Malfunction disappears.

   HINT:
   1. Connect all connectors to speakers.
   2. 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.

| OK |

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

NG |

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR DIAGNOSTIC TROUBLE CODE CHART

10.CHECK WIRE HARNESS (RADIO RECEIVER - REAR NO. 1 SPEAKER)

1. Disconnect the R2 receiver connector.

1. Disconnect the S17, S18, S19 or S20 speaker connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition
     R2-1 (RR+) - S18-1*1 or S20-1*2 | Below 1 Ω
     R2-3 (RR-) - S18-2*1 or S20-2*2 | Below 1 Ω
     R2-1 (RR+) - Body ground | 10 kΩ or higher
     R2-3 (RR-) - Body ground | 10 kΩ or higher
     R2-2 (RL+) - S17-1*1 or S19-1*2 | Below 1 Ω
     R2-6 (RL-) - S17-2*1 or S19-2*2 | Below 1 Ω
     R2-2 (RL+) - Body ground | 10 kΩ or higher
     R2-6 (RL-) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

11.INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

1. Check the rear No. 1 speaker assembly (Click here).

   OK:
     Rear No. 1 speaker is normal.

| NG |

REPLACE REAR NO. 1 SPEAKER ASSEMBLY

OK |

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR DIAGNOSTIC TROUBLE CODE CHART