Speaker Circuit

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Speaker Circuit

Speaker Circuit

DESCRIPTION

The sound signal that has been amplified by the stereo component amplifier or radio receiver is sent to the speakers from the stereo component amplifier or radio receiver through this circuit.
If there is a short in this circuit, the stereo component amplifier detects it and stops output to the speakers.
Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier or speakers.
There are two cases when a short is detected.

- When a short is detected in the rear No. 2 speaker circuit, sound cannot be heard only from the rear No. 2 speaker.
- When a short is detected in any circuit other than the rear No. 2 speaker circuit, sound cannot be heard from all speakers including the rear No. 2 speaker.

WIRING DIAGRAM

















INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR





(a) Disconnect the connectors shown in the illustration from the stereo component amplifier or the radio receiver and speakers.
(b) Measure the resistance between speakers or between a speaker and the stereo component amplifier or the radio receiver to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms





(c) Measure the resistance between body ground and the stereo component amplifier to check for a short circuit in the wire harness.
Standard resistance:
10 kOhms or higher

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

2. INSPECT FRONT NO. 1 SPEAKER
(a) Resistance check
(1) Measure the resistance between the terminals of the speakers.
Standard resistance:
9 Speaker System
Approximately 4 Ohms
12 Speaker System
1.8 to 2.6 Ohms

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

3. INSPECT FRONT NO. 2 SPEAKER
(a) Check that the malfunction disappears when another speaker in good condition is installed.
OK:
Malfunction disappears.

HINT:
- Connect all the connectors to the speakers.
- When there is a possibility that either the right or left front speaker is defective, inspect it by interchanging the right one with the left one.

OK -- REPLACE FRONT NO. 2 SPEAKER

NG -- Continue to next step.

4. INSPECT REAR SPEAKER
(a) Resistance check
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
9 Speaker System
3.2 to 4.8 Ohms
12 Speaker System
1.8 to 2.6 Ohms

NG -- REPLACE REAR SPEAKER
OK -- Continue to next step.

5. INSPECT STEREO COMPONENT SPEAKER
(a) Check that the malfunction disappears when another speaker in good condition is installed.
OK:
Malfunction disappears.

HINT:
- Connect all the connectors to the speakers.
- When there is a possibility that either the right or left front speaker is defective, inspect it by interchanging the right one with the left one.

OK -- REPLACE STEREO COMPONENT SPEAKER

NG -- Continue to next step.

6. INSPECT FRONT STEREO COMPONENT SPEAKER





(a) Resistance check
(1) Measure the resistance between the terminals of the front stereo component speaker.
Standard resistance:










NG -- REPLACE FRONT STEREO COMPONENT SPEAKER
OK -- Continue to next step.

7. INSPECT REAR NO. 2 SPEAKER

HINT: If the vehicle is not equipped with a rear No. 2 speaker, proceed to the next step.

(a) Resistance check
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
1.8 to 2.6 Ohms

NG -- REPLACE REAR NO. 2 SPEAKER
OK -- Continue to next step.

8. INSPECT ROOF SPEAKER

HINT: If the vehicle is not equipped with a roof speaker, proceed to the next step.

(a) Resistance check
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
1.5 to 2.1 Ohms

NG -- REPLACE ROOF SPEAKER
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE