AUDIO AND VISUAL SYSTEM > Speaker Circuit

for Preparation Click here


DESCRIPTION

The radio receiver sends sound signals to the speakers.

WIRING DIAGRAM


E106752E03


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)
I044961E01

  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)
E110356E02

  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
E110354

  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)
I043618E01

  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)
I043620E01

  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