Audio And Visual System (W/O Multi-Display) Speaker Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

INSPECT REAR SPEAKER ASSEMBLY

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

DESCRIPTION

1. If there is a short in this circuit, the radio receiver assembly detects it and stops output to the speakers.
   
2. Thus sound cannot be heard from the speakers even if there is no malfunction in the radio receiver assembly or speakers.
   
3. If a short is detected in a speaker circuit, no sound can be heard from the speakers.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

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

2. for 4 speakers:
   Measure the resistance between each of the front No. 1 speaker assemblies and the radio receiver assembly to check for an open circuit in the wire harness.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E1-1 (FR+) - H1-1	Always	Below 1 Ω
   E1-5 (FR-) - H1-2	Always	Below 1 Ω
   E1-2 (FL+) - I1-1	Always	Below 1 Ω
   E1-6 (FL-) - I1-2	Always	Below 1 Ω

3. for 6 speakers:
   Measure the resistance between each of the front No. 2 speaker assemblies and the radio receiver assembly to check for an open circuit in the wire harness.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E1-1 (FR+) - H4-4 (+)	Always	Below 1 Ω
   E1-5 (FR-) - H4-2 (-)	Always	Below 1 Ω
   E1-2 (FL+) - I4-4 (+)	Always	Below 1 Ω
   E1-6 (FL-) - I4-2 (-)	Always	Below 1 Ω

4. for 6 speakers:
   Measure the resistance between each of the front No. 2 speaker assemblies and the front No. 1 speaker assemblies to check for an open circuit in the wire harness.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H4-3 (TWR+) - H1-1	Always	Below 1 Ω
   H4-1 (TWR-) - H1-2	Always	Below 1 Ω
   I4-3 (TWL+) - I1-1	Always	Below 1 Ω
   I4-1 (TWL-) - I1-2	Always	Below 1 Ω

5. Measure the resistance between each of the rear speaker assemblies and the radio receiver assembly to check for an open circuit in the wire harness.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E2-1 (RR+) - L1-1	Always	Below 1 Ω
   E2-3 (RR-) - L1-2	Always	Below 1 Ω
   E2-2 (RL+) - L2-1	Always	Below 1 Ω
   E2-6 (RL-) - L2-2	Always	Below 1 Ω

6. 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
   E1-1 (FR+) - Body ground	Always	10 kΩ or higher
   E1-5 (FR-) - Body ground	Always	10 kΩ or higher
   E1-2 (FL+) - Body ground	Always	10 kΩ or higher
   E1-6 (FL-) - Body ground	Always	10 kΩ or higher
   E2-1 (RR+) - Body ground	Always	10 kΩ or higher
   E2-3 (RR-) - Body ground	Always	10 kΩ or higher
   E2-2 (RL+) - Body ground	Always	10 kΩ or higher
   E2-6 (RL-) - Body ground	Always	10 kΩ or higher
   H4-3 (TWR+) - Body ground*1	Always	10 kΩ or higher
   H4-1 (TWR-) - Body ground*1	Always	10 kΩ or higher
   I4-3 (TWL+) - Body ground*1	Always	10 kΩ or higher
   I4-1 (TWL-) - Body ground*1	Always	10 kΩ or higher

   *1: for 6 Speakers
   

1. Resistance check
   

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      H1-1 - H1-2	Always	3.2 to 4.8 Ω
      I1-1 - I1-2	Always	3.2 to 4.8 Ω

      Text in Illustration

      *A	RH
      *B	LH
      *a	Component without harness connected (Front No. 1 Speaker Assembly)

1. Resistance check
   

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      L1-1 - L1-2	Always	3.2 to 4.8 Ω
      L2-1 - L2-2	Always	3.2 to 4.8 Ω

   2. Proceed to the next step based on the inspection result.
      

      Result:

      Result	Proceed to
      NG	A
      OK (for 6 speakers)	B
      OK (for 4 speakers)	C

1. Check that the malfunction disappears when a known good speaker is installed (COROLLA_ZRE142 RM000002XAP016X.html).
   

   OK:

   Malfunction disappears.
   

   HINT:

   1. Connect all the connectors to the front No. 2 speaker assemblies that were disconnected.
      
   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.
      
   3. Perform the above inspection on both LH and RH sides.