Speaker Circuit

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Speaker Circuit

Speaker Circuit

DESCRIPTION

- When the vehicle has a built-in type amplifier, a sound signal is sent from the radio receiver to the speakers via the "6 Speaker System" circuit.
- When 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 "9 Speaker System".

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 VEHICLE EQUIPMENT

Vehicle equipment





B -- CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - SPEAKER)
A -- Continue to next step.

2. CHECK WIRE HARNESS (RADIO RECEIVER - SPEAKER)




(a) Disconnect the R3 and R4 receiver connectors.
(b) Disconnect the T6, T7, R11 and R12 speaker connectors.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






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

3. CHECK WIRE HARNESS (FRONT NO. 1 SPEAKER - FRONT NO. 2 SPEAKER)




(a) Disconnect the F12, F13, T6 and T7 speaker connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






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

4. INSPECT FRONT NO. 1 SPEAKER




(a) Disconnect the F12 and F13 speaker connectors.
(b) Measure the resistance of the speaker.
Standard resistance:






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

5. INSPECT FRONT NO. 2 SPEAKER
(a) Check that the malfunction disappears when the speaker is replaced with a normal one.
OK:
Malfunction disappears.
HINT:
- Connect all the connectors to the front No. 2 speakers.
- 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 inspection above on both LH and RH sides.

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

6. INSPECT REAR NO. 1 SPEAKER




(a) Disconnect the R11 and R12 speaker connectors.
(b) Measure the resistance of the speaker.
Standard resistance:






NG -- REPLACE REAR NO. 1 SPEAKER
OK -- REPLACE RADIO RECEIVER
7. CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - SPEAKER)




(a) Disconnect the S14 and S29 amplifier connectors.
(b) Disconnect the C8, F12, F13, T6, T7, T8 and T9 speaker connectors.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






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

8. CHECK WIRE HARNESS (REAR NO. 1 SPEAKER - REAR NO. 2 SPEAKER)




(a) Disconnect the R11, R12, T8 and T9 speaker connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






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

9. INSPECT FRONT NO. 1 SPEAKER




(a) Disconnect the F12 and F13 speaker connectors.
(b) Measure the resistance of the speaker.
Standard resistance:






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

10. INSPECT FRONT NO. 2 SPEAKER
(a) Check that the malfunction disappears when the speaker is replaced with a normal one.
OK :
Malfunction disappears
HINT:
- Connect all the connectors to the front No. 2 speakers.
- 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 inspection above on both LH and RH sides.

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

11. INSPECT REAR NO. 1 SPEAKER




(a) Disconnect the R11 and R12 speaker connectors.
(b) Measure the resistance of the speaker.
Standard resistance:






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

12. INSPECT REAR NO. 2 SPEAKER
(a) Check that the malfunction disappears when the speaker is replaced with a normal one.
OK:
Malfunction disappears.
HINT:
- Connect all the connectors to the rear No. 2 speakers.
- When there is a possibility that either the right or left rear speaker is defective, inspect by interchanging the right one with the left one.
- Perform the inspection above on both LH or RH sides.

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

13. INSPECT FRONT STEREO COMPONENT SPEAKER




(a) Disconnect the C8 speaker connector.
(b) Measure the resistance of the speaker.
Standard resistance:






NG -- REPLACE FRONT STEREO COMPONENT SPEAKER
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE