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 "Standard Model" 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 "Premium Model" 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 or radio receiver and speakers.
(b) Premium Model:
Measure the resistance between each of the front No. 2 speakers and the stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(c) Standard Model:
Measure the resistance between each of the front No. 2 speakers and the radio receiver to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(d) Premium Model:
Measure the resistance between each of the front No. 1 speakers and the stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(e) Standard Model:
Measure the resistance between each of the front No. 2 speakers and each of the front No. 1 speakers to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(f) Premium Model:
Measure the resistance between each of the rear speakers and the stereo component amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms
(g) Standard Model:
Measure the resistance between each of the rear speakers and the radio receiver to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ohms




(h) Measure the resistance between each speaker and body ground 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 speaker.
Standard resistance:
Premium Model
1.8 to 2.6 Ohms
Standard Model
Approximately 4 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 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.

OK -- REPLACE FRONT NO. 2 SPEAKER
NG -- Continue to next step.
4. CONFIRM MODEL
Result:






B -- INSPECT REAR SPEAKER
A -- Continue to next step.
5. INSPECT REAR SPEAKER




(a) Woofer speaker:
(1) Measure the resistance according to the value(s) in the table below.
NOTICE: The speaker should not be removed for checking.

Standard resistance:





(b) Tweeter speaker:
(1) Check that the malfunction disappears when another rear speaker in good condition is installed.
OK:
Malfunction appears.
HINT:
- Connect all the connectors to the rear 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.

NG -- REPLACE REAR SPEAKER
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
6. 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 -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE