Speaker Circuit
AUDIO AND VISUAL SYSTEM: Speaker Circuit
Speaker Circuit
DESCRIPTION
The sound signal that has been amplified by the stereo component amplifier is sent to the speakers from the stereo component amplifier 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK HARNESS AND CONNECTOR
(a) Disconnect the connectors shown in the illustration from the stereo component amplifier and speakers.
(b) Measure the resistance between the front stereo component speaker and the stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(c) Measure the resistance between the front No. 2 speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(d) without Rear Header Speaker:
Measure the resistance between the front No. 2 speakers and front No. 1 speakers to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(e) without Rear Header Speaker:
Measure the resistance between the rear speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(f) with Rear Header Speaker:
Measure the resistance between the rear No. 2 speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(g) with Rear Header Speaker:
Measure the resistance between the rear No. 2 speakers and rear speakers to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(h) with Rear Header Speaker:
Measure the resistance between the rear header speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(i) with Rear Header Speaker:
Measure the resistance between the front No. 1 speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(j) Measure the resistance between the stereo component speaker and stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CONFIRM MODEL
Result:
B -- INSPECT FRONT STEREO COMPONENT SPEAKER
A -- Continue to next step.
3. INSPECT FRONT STEREO COMPONENT SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
Approximately 8 Ohms
NG -- REPLACE FRONT STEREO COMPONENT SPEAKER
OK -- Continue to next step.
4. INSPECT FRONT NO. 1 SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
Approximately 8 Ohms
NG -- REPLACE FRONT NO. 1 SPEAKER
OK -- Continue to next step.
5. 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 front No. 2 speaker.
- When there is a possibility that either the right or left front speaker is detective, inspect by interchanging the right one with the left one.
- Perform the above inspection on both LH and RH sides.
NG -- REPLACE FRONT NO. 2 SPEAKER
OK -- Continue to next step.
6. INSPECT REAR SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
Approximately 8 Ohms
NG -- REPLACE REAR SPEAKER
OK -- Continue to next step.
7. INSPECT REAR 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 rear No. 2 speaker.
- When there is a possibility that either the right or left rear speaker is detective, inspect by interchanging the right one with the left one.
- Perform the above inspection on both LH and RH sides.
NG -- REPLACE REAR NO. 2 SPEAKER
OK -- Continue to next step.
8. INSPECT REAR HEADER SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
Approximately 8 Ohms
NG -- REPLACE REAR HEADER SPEAKER
OK -- Continue to next step.
9. INSPECT STEREO COMPONENT SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
NG -- REPLACE STEREO COMPONENT SPEAKER
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
10. INSPECT FRONT STEREO COMPONENT SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
Approximately 10 Ohms
NG -- REPLACE FRONT STEREO COMPONENT SPEAKER
OK -- Continue to next step.
11. INSPECT FRONT NO. 1 SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
Approximately 4 Ohms
NG -- REPLACE FRONT NO. 1 SPEAKER
OK -- Continue to next step.
12. INSPECT FRONT NO. 2 SPEAKER
(a) Check that the malfunction disappears when another speaker in good condition is installed.
Standard:
Malfunction disappears.
HINT:
- Connect all the connectors to the front No. 2 speaker.
- When there is a possibility that either the right or left front speaker is detective, inspect by interchanging the right one with the left one.
- Perform the above inspection on both LH and RH sides.
NG -- REPLACE FRONT NO. 2 SPEAKER
OK -- Continue to next step.
13. INSPECT REAR SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
Approximately 4 Ohms
NG -- REPLACE REAR SPEAKER
OK -- Continue to next step.
14. INSPECT STEREO COMPONENT SPEAKER
(a) Resistance check.
(1) Measure the resistance between the terminals of the speaker.
Standard resistance:
NG -- REPLACE STEREO COMPONENT SPEAKER
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE