AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) Speaker Circuit

DESCRIPTION

The sound signals amplified by the radio receiver assembly are sent to the speakers from the radio receiver assembly via the speaker circuit.

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

Thus sound cannot be heard from the speakers even if there is not a malfunction in the radio receiver assembly or speakers.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT)

   
   

   • *1: for RH Side

   • *2: for LH Side

   • *3: except 2 Speakers

   
   

   1. Disconnect the R1 and/or R2*3 radio receiver assembly connector.

   2. Disconnect the S16*1 and/or S15*2 front No. 1 speaker assembly connector.

   3. for Double Cab:

      Disconnect the T24*1 and/or T23*2 front No. 2 speaker assembly connector.

   4. for Double Cab:

      Disconnect the S18*1 and/or S17*2 rear speaker assembly connector.

   5. for Extra Cab:

      Disconnect the S20*1 and/or S19*2 rear speaker assembly connector.

      Standard Resistance
      for 6 Speakers RH Side Tester Connection Condition Specified Condition R1-1 (FR+) - T24-4 Always Below 1 Ω R1-5 (FR-) - T24-2 Always Below 1 Ω T24-3 (+) - S16-1 Always Below 1 Ω T24-1 (-) - S16-2 Always Below 1 Ω R2-1 (RR+) - S18-1 Always Below 1 Ω R2-3 (RR-) - S18-2 Always Below 1 Ω R1-1 (FR+) - Body ground Always 10 kΩ or higher R1-5 (FR-) - Body ground Always 10 kΩ or higher T24-3 - Body ground Always 10 kΩ or higher T24-1 - Body ground Always 10 kΩ or higher R2-1 (RR+) - Body ground Always 10 kΩ or higher R2-3 (RR-) - Body ground Always 10 kΩ or higher
      for 6 Speakers LH Side Tester Connection Condition Specified Condition R1-2 (FL+) - T23-4 Always Below 1 Ω R1-6 (FL-) - T23-2 Always Below 1 Ω T23-3 - S15-1 Always Below 1 Ω T23-1 - S15-2 Always Below 1 Ω R2-2 (RL+) - S17-1 Always Below 1 Ω R2-6 (RL-) - S17-2 Always Below 1 Ω R1-2 (FL+) - Body ground Always 10 kΩ or higher R1-6 (FL-) - Body ground Always 10 kΩ or higher T23-3 - Body ground Always 10 kΩ or higher T23-1 - Body ground Always 10 kΩ or higher R2-2 (RL+) - Body ground Always 10 kΩ or higher R2-6 (RL-) - Body ground Always 10 kΩ or higher
      except 6 Speakers RH Side (for Double Cab) Tester Connection Condition Specified Condition R1-1 (FR+) - S16-1 Always Below 1 Ω R1-5 (FR-) - S16-2 Always Below 1 Ω R2-1 (RR+) - S18-1* Always Below 1 Ω R2-3 (RR-) - S18-2* Always Below 1 Ω R1-1 (FR+) - Body ground Always 10 kΩ or higher R1-5 (FR-) - Body ground Always 10 kΩ or higher R2-1 (RR+) - Body ground* Always 10 kΩ or higher R2-3 (RR-) - Body ground* Always 10 kΩ or higher
      except 6 Speakers LH Side (for Double Cab) Tester Connection Condition Specified Condition R1-2 (FL+) - S15-1 Always Below 1 Ω R1-6 (FL-) - S15-2 Always Below 1 Ω R2-2 (RL+) - S17-1* Always Below 1 Ω R2-6 (RL-) - S17-2* Always Below 1 Ω R1-2 (FL+) - Body ground Always 10 kΩ or higher R1-6 (FL-) - Body ground Always 10 kΩ or higher R2-2 (RL+) - Body ground* Always 10 kΩ or higher R2-6 (RL-) - Body ground* Always 10 kΩ or higher
      except 6 Speakers RH Side (except Double Cab) Tester Connection Condition Specified Condition R1-1 (FR+) - S16-1 Always Below 1 Ω R1-5 (FR-) - S16-2 Always Below 1 Ω R2-1 (RR+) - S20-1* Always Below 1 Ω R2-3 (RR-) - S20-2* Always Below 1 Ω R1-1 (FR+) - Body ground Always 10 kΩ or higher R1-5 (FR-) - Body ground Always 10 kΩ or higher R2-1 (RR+) - Body ground* Always 10 kΩ or higher R2-3 (RR-) - Body ground* Always 10 kΩ or higher
      except 6 Speakers LH Side (except Double Cab) Tester Connection Condition Specified Condition R1-2 (FL+) - S15-1 Always Below 1 Ω R1-6 (FL-) - S15-2 Always Below 1 Ω R2-2 (RL+) - S19-1* Always Below 1 Ω R2-6 (RL-) - S19-2* Always Below 1 Ω R1-2 (FL+) - Body ground Always 10 kΩ or higher R1-6 (FL-) - Body ground Always 10 kΩ or higher R2-2 (RL+) - Body ground* Always 10 kΩ or higher R2-6 (RL-) - Body ground* Always 10 kΩ or higher

      
      

      • *: for 4 Speakers

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

2. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

   
   

   1. Disconnect the S16*1 and/or S15*2 front No. 1 speaker assembly connector.

      
      

      • *1: for RH

      • *2: for LH

   2. Inspect the front No. 1 speaker assembly Click here.

      Result

      Result	Proceed to
      OK (for 6 Speakers)	A
      OK (for 4 Speakers)	B
      OK (for 2 Speakers)	C
      NG	D

   
   

   B

   INSPECT REAR SPEAKER ASSEMBLY Click here

   C

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

   D

   REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

   A

3. CHECK FRONT NO. 2 SPEAKER ASSEMBLY

   
   

   1. Replace the front No. 2 speaker with a known good one Click here.

   2. Check that the malfunction disappears.

      Tech Tips

      
      

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

      • 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 LH and RH sides.

      OK
      Malfunction disappears.

   
   

   NG

   INSPECT REAR SPEAKER ASSEMBLY Click here

   OK

   END (FRONT NO. 2 SPEAKER ASSEMBLY IS DEFECTIVE)

4. INSPECT REAR SPEAKER ASSEMBLY

   
   

   • *1: for RH

   • *2: for LH

   
   

   1. for Double Cab:

      Disconnect the S18*1 and/or S17*2 rear speaker assembly connector.

   2. for Extra Cab:

      Disconnect the S20*1 and/or S19*2 rear speaker assembly connector.

   3. Inspect the rear speakers assembly Click here.

   
   

   NG

   REPLACE REAR SPEAKER ASSEMBLY Click here

   OK

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