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

DESCRIPTION

• If there is a short in this 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 no malfunction in the radio receiver assembly or speakers.

• If a short is detected in a speaker circuit, no sound can be heard from the speakers.

WIRING DIAGRAM

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

   
   

   1. Disconnect the connectors from the radio receiver assembly and speakers.

   2. Measure the resistance between the front No. 1 speaker assembly RH and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H48-1 (FR+) - J1-1 Always Below 1 Ω H48-5 (FR-) - J1-2 Always Below 1 Ω

   3. Measure the resistance between the front No. 1 speaker assembly LH and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H48-2 (FL+) - K1-1 Always Below 1 Ω H48-6 (FL-) - K1-2 Always Below 1 Ω

   4. Measure the resistance between the radio setting condenser and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H48-1 (FR+) - H46-3 (RIN) Always Below 1 Ω H48-5 (FR-) - H46-6 (ROUT) Always Below 1 Ω

   5. Measure the resistance between the front No. 2 speaker assembly RH and the radio setting condenser to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H46-8 (RI+) - I3-2 Always Below 1 Ω H46-7 (RI-) - I3-1 Always Below 1 Ω

   6. Measure the resistance between the radio setting condenser and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H48-2 (FL+) - H46-1 (LIN) Always Below 1 Ω H48-6 (FL-) - H46-2 (LOUT) Always Below 1 Ω

   7. Measure the resistance between the front No. 2 speaker assembly LH and the radio setting condenser to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H46-4 (LI+) - I5-2 Always Below 1 Ω H46-5 (LI-) - I5-1 Always Below 1 Ω

   8. Measure the resistance between the rear speaker assembly RH and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H49-1 (RR+) - L4-1 Always Below 1 Ω H49-3 (RR-) - L4-2 Always Below 1 Ω

   9. Measure the resistance between the rear speaker assembly LH and the radio receiver assembly to check for an open circuit in the wire harness.

      Standard Resistance
      Tester Connection Condition Specified Condition H49-2 (RL+) - M4-1 Always Below 1 Ω H49-6 (RL-) - M4-2 Always Below 1 Ω

   10. Measure the resistance between the radio receiver assembly and body ground to check for a short circuit in the wire harness.

       Standard Resistance

       Tester Connection Condition Specified Condition H48-1 (FR+) - Body ground Always 10 kΩ or higher H48-5 (FR-) - Body ground Always 10 kΩ or higher H48-2 (FL+) - Body ground Always 10 kΩ or higher H48-6 (FL-) - Body ground Always 10 kΩ or higher H49-1 (RR+) - Body ground Always 10 kΩ or higher H49-3 (RR-) - Body ground Always 10 kΩ or higher H49-2 (RL+) - Body ground Always 10 kΩ or higher H49-6 (RL-) - Body ground Always 10 kΩ or higher

   11. Measure the resistance between the radio setting condenser and body ground to check for a short circuit in the wire harness.

       Standard Resistance
       Tester Connection Condition Specified Condition H46-8 (RI+) - Body ground Always 10 kΩ or higher H46-7 (RI-) - Body ground Always 10 kΩ or higher H46-4 (LI+) - Body ground Always 10 kΩ or higher H46-5 (LI-) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

2. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Front No. 1 Speaker Assembly)

      Resistance check

      
      

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

         Standard Resistance
         Tester Connection Condition Specified Condition J1-1 - J1-2 Always 3.2 to 4.8 Ω K1-1 - K1-2 Always 3.2 to 4.8 Ω

   
   

   NG

   REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Click here

   OK

3. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Front No. 2 Speaker Assembly)

      Resistance check

      
      

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

         Standard Resistance
         Tester Connection Condition Specified Condition I3-2 - I3-1 Always 3.2 to 4.8 Ω I5-2 - I5-1 Always 3.2 to 4.8 Ω

   
   

   NG

   REPLACE FRONT NO. 2 SPEAKER ASSEMBLY Click here

   OK

4. REPLACE RADIO SETTING CONDENSER

   
   

   1. Check that the malfunction disappears when a known good radio setting condenser is installed.

      OK
      Malfunction disappears.

   
   

   OK

   END (RADIO SETTING CONDENSER WAS DEFECTIVE)

   NG

5. INSPECT REAR SPEAKER ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Rear Speaker Assembly)

      Resistance check

      
      

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

         Standard Resistance
         Tester Connection Condition Specified Condition L4-1 - L4-2 Always 3.2 to 4.8 Ω M4-1 - M4-2 Always 3.2 to 4.8 Ω

   
   

   OK

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

   NG

   REPLACE REAR SPEAKER ASSEMBLY