Speaker Circuit

AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (w/o Multi-display): Speaker Circuit; 2013 MY Corolla [07/2012 -]
- 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





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

(a) Disconnect the connectors from the radio receiver assembly and speakers.

(b) 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:





(c) 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:





(d) 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:





(e) 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:





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

Standard Resistance:





*1: for 6 Speakers

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT NO. 1 SPEAKER ASSEMBLY Removal
OK -- Continue to next step.

3. INSPECT REAR SPEAKER ASSEMBLY

(a) Resistance check





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

Standard Resistance:





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

Result:





Text in Illustration





B -- REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

C -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

A -- REPLACE REAR SPEAKER ASSEMBLY Removal

4. REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Check that the malfunction disappears when a known good speaker is installed Removal.

OK:

Malfunction disappears.

HINT
* Connect all the connectors to the front No. 2 speaker assemblies that were disconnected.
* 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.

NG -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

OK -- END (FRONT NO. 2 SPEAKER ASSEMBLY WAS DEFECTIVE)