Speaker Circuit

AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Speaker Circuit

Speaker Circuit

DESCRIPTION

- If the vehicle has a built-in type amplifier, a sound signal is sent from the radio receiver to the speakers via the "for 6 Speakers" circuit.
- If the vehicle has a separate type amplifier, a sound signal from the radio receiver is amplified by the stereo component amplifier and then transmitted to the speaker via the "for 13 Speakers" circuit.

If there is a short in speaker circuit, the stereo component amplifier detects short 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 from the stereo component amplifier or radio receiver and speakers.




(b) for 13 Speakers:
Measure the resistance between each of the front No. 2 speakers and stereo component amplifier 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 speakers and radio receiver to check for an open circuit in the wire harness.
Standard Resistance:





(d) for 13 Speakers:
Measure the resistance between each of the front No. 1 speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard Resistance:





(e) for 13 Speakers:
Measure the resistance between each of the front No. 4 speakers and radio receiver to check for an open circuit in the wire harness.
Standard Resistance:





(f) for 13 Speakers:
Measure the resistance between each of the rear No. 2 speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard Resistance:





(g) for 6 Speakers:
Measure the resistance between each of the rear speakers and radio receiver to check for an open circuit in the wire harness.
Standard Resistance:





(h) for 13 Speakers:
Measure the resistance between each of the rear speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard Resistance:





(i) for 13 Speakers:
Measure the resistance between each of rear No. 3 speakers and stereo component amplifier to check for an open circuit in the wire harness.
Standard Resistance:





(j) for 6 Speakers:
Measure the resistance between each of the front No. 1 speakers and front No. 2 speakers to check for an open circuit in the wire harness.
Standard Resistance:





(k) for 13 Speakers:
Measure the resistance between each of the front No. 2 speakers and front No. 3 speakers to check for an open circuit in the wire harness.
Standard Resistance:





(l) for 13 Speakers:
Measure the resistance between the stereo component amplifier and body ground to check for a short circuit in the wire harness.
Standard Resistance:





(m) for 6 Speakers:
Measure the resistance between each speaker or radio receiver and body ground to check for a short circuit in the wire harness.
Standard Resistance:





Text in Illustration





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 according to the value(s) in the table below.
Standard Resistance:

for 13 Speakers





for 6 Speakers





Text in Illustration





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

3. INSPECT REAR SPEAKER




(a) Resistance check
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

for 13 Speakers





for 6 Speakers





Text in Illustration





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

4. CONFIRM MODEL
Result:





B -- INSPECT FRONT NO. 4 SPEAKER
A -- Continue to next step.

5. INSPECT FRONT NO. 2 SPEAKER
(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.
- 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
OK -- END (FRONT NO. 2 SPEAKER WAS DEFECTIVE)
6. INSPECT FRONT NO. 4 SPEAKER




(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. 4 SPEAKER
OK -- Continue to next step.

7. INSPECT REAR NO. 2 SPEAKER




(a) Resistance check
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





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

8. INSPECT REAR NO. 3 SPEAKER




(a) Resistance check
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPLACE REAR NO. 3 SPEAKER
OK -- Continue to next step.

9. INSPECT FRONT NO. 2 SPEAKER




(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. 2 SPEAKER
OK -- Continue to next step.

10. INSPECT FRONT NO. 3 SPEAKER
(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. 3 speaker.
- 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
OK -- END (FRONT NO. 3 SPEAKER WAS DEFECTIVE)