DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR
INSPECT FRONT NO. 1 SPEAKER
INSPECT FRONT NO. 2 SPEAKER
INSPECT FRONT NO. 3 SPEAKER
INSPECT REAR NO. 2 SPEAKER
CONFIRM MODEL
INSPECT REAR SPEAKER
INSPECT REAR STEREO COMPONENT SPEAKER
INSPECT FRONT STEREO COMPONENT SPEAKER
INSPECT WOOFER BOX SPEAKER
INSPECT REAR NO. 3 SPEAKER
INSPECT REAR SPEAKER
INSPECT WOOFER BOX SPEAKER
AUDIO AND VISUAL SYSTEM - 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
| 1.CHECK HARNESS AND CONNECTOR |
Disconnect the connectors shown in the illustration from the stereo component amplifier and speakers.
with Front Center Speaker:
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 Ω
Measure the resistance between each of the front No. 3 speakers and the stereo component amplifier to check for an open circuit in the wire harness.
- Standard resistance:
- Below 1 Ω
Measure the resistance between each of the front No. 2 speakers and the front No. 3 speakers to check for an open circuit in the wire harness.
- Standard resistance:
- Below 1 Ω
without Front Center Speaker:
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 Ω
with Front Center Speaker:
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 Ω
without Front Center Speaker:
Measure the resistance between each of the rear No. 3 speakers and the stereo component amplifier to check for an open circuit in the wire harness.
- Standard resistance:
- Below 1 Ω
without Front Center Speaker:
Measure the resistance between each of the rear No. 2 speakers and the rear No. 3 speakers to check for an open circuit in the wire harness.
- Standard resistance:
- Below 1 Ω
with Front Center Speaker:
Measure the resistance between each of the rear No. 2 speakers and the rear speakers to check for an open circuit in the wire harness.
- Standard resistance:
- Below 1 Ω
with Front Center Speaker:
Measure the resistance between each of the rear stereo component speakers and the stereo component amplifier to check for an open circuit in the wire harness.
- Standard resistance:
- Below 1 Ω
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 Ω
Measure the resistance between the woofer box speaker and the stereo component amplifier to check for an open circuit in the wire harness.
- Standard resistance:
- Below 1 Ω
Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.
- Standard resistance:
- 10 kΩ or higher
Check that the malfunction disappears when another speaker in good condition is installed.
- Standard:
- Malfunction disappears.
Connect all the connectors to the rear speakers.
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.
| 8.INSPECT REAR STEREO COMPONENT SPEAKER |
Check that the malfunction disappears when another speaker in good condition is installed.
- OK:
- Malfunction disappears.
Connect all the connectors to the rear stereo component speakers.
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.
| | REPLACE REAR STEREO COMPONENT SPEAKER |
|
|
| 9.INSPECT FRONT STEREO COMPONENT SPEAKER |
Resistance check.
Measure the resistance between the terminals of the speaker.
- Standard resistance:
- 7 to 9 Ω
| | REPLACE FRONT STEREO COMPONENT SPEAKER |
|
|
| 10.INSPECT WOOFER BOX SPEAKER |
Resistance check.
Measure the resistance according to the value(s) in the table below.
- The speaker should not be removed for checking.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| 3 - 4 | Always | 7 to 8.6 Ω |
| | REPLACE WOOFER BOX SPEAKER |
|
|
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 11.INSPECT REAR NO. 3 SPEAKER |
Check that the malfunction disappears when another speaker in good condition is installed.
- Standard:
- Malfunction disappears.
Connect all the connectors to the rear No. 3 speakers.
When there is a possibility that either the right or left rear No. 3 speaker is detective, inspect by interchanging the right one with the left one.
Perform the above inspection of both LH or RH sides.
| | REPLACE REAR NO. 3 SPEAKER |
|
|
Resistance check.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- Approximately 4 Ω
- Perform the above inspection on both LH and RH sides.
| 13.INSPECT WOOFER BOX SPEAKER |
Resistance check.
Measure the resistance according to the value(s) in the table below.
- The speaker should not be removed for checking.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| 1 - 3 | Always | Approximately 2 Ω |
| 2 - 4 | Always | Approximately 2 Ω |
| | REPLACE WOOFER BOX SPEAKER |
|
|
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
LEXUS IS250, IS220d / GSE20 ALE20
