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Home >> Lexus >> 2008 >> IS F V8-5.0L (2UR-GSE) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Testing and Inspection >> Component Tests and General Diagnostics >> Speaker Circuit

Speaker Circuit









AUDIO / VIDEO: 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) w/ Front Center Speaker
Measure the resistance between the front stereo component speaker and the stereo component amplifier to check for an open and short circuit in the wire harness.
Standard Resistance:





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





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










(e) w/o Front Center Speaker
Measure the resistance between each of the rear speakers and the stereo component amplifier to check for an open and short circuit in the wire harness.
Standard Resistance:





(f) w/ Front Center Speaker
Measure the resistance between each of the rear speakers and the stereo component amplifier to check for an open and short circuit in the wire harness.
Standard Resistance:





(g) w/o Front Center Speaker
Measure the resistance between each of the rear No. 3 speakers and the stereo component amplifier to check for an open and short circuit in the wire harness.
Standard Resistance:





(h) w/o 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 and short circuit in the wire harness.
Standard Resistance:





(i) w/ Front Center Speaker
Measure the resistance between each of the rear No. 2 speakers and the rear speakers to check for an open and short circuit in the wire harness.
Standard Resistance:





(j) w/ Front Center Speaker
Measure the resistance between each of the rear stereo component speakers and the stereo component amplifier to check for an open and short circuit in the wire harness.
Standard Resistance:





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





(l) w/ Front Center Speaker
Measure the resistance between the woofer box speaker and the stereo component amplifier to check for an open and short circuit in the wire harness.
Standard Resistance:





(m) w/o Front Center Speaker
Measure the resistance between the woofer box speaker and the stereo component amplifier to check for an open and short circuit in the wire harness.
Standard Resistance:






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:










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.
Standard:
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 above inspection on both LH and RH sides.

NG -- INSPECT FRONT NO. 3 SPEAKER
OK -- REPLACE FRONT NO. 2 SPEAKER
4. INSPECT FRONT NO. 3 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 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 above inspection on both LH and RH sides.

NG -- INSPECT REAR NO. 2 SPEAKER
OK -- REPLACE FRONT NO. 3 SPEAKER
5. INSPECT REAR 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 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 above inspection on both LH and RH sides.

NG -- CONFIRM MODEL
OK -- REPLACE REAR NO. 2 SPEAKER
6. CONFIRM MODEL
Result:






B -- INSPECT REAR NO. 3 SPEAKER
A -- Continue to next step.
7. INSPECT REAR 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 rear 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 above inspection on both LH and RH sides.

NG -- INSPECT REAR STEREO COMPONENT SPEAKER
OK -- REPLACE REAR SPEAKER
8. INSPECT REAR STEREO COMPONENT 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 stereo component 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 above inspection on both LH and RH sides.

NG -- INSPECT FRONT STEREO COMPONENT SPEAKER
OK -- REPLACE REAR STEREO COMPONENT SPEAKER
9. INSPECT FRONT STEREO COMPONENT SPEAKER





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






NG -- REPLACE FRONT STEREO COMPONENT SPEAKER
OK -- Continue to next step.
10. INSPECT WOOFER BOX SPEAKER





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

Standard Resistance:






NG -- REPLACE WOOFER BOX SPEAKER
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
11. INSPECT REAR NO. 3 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 rear No. 3 speakers.
- When there is a possibility that either the right or left rear No. 3 speaker is defective, inspect by interchanging the right one with the left one.
- Perform the above inspection of both LH and RH sides.

NG -- INSPECT REAR SPEAKER
OK -- REPLACE REAR NO. 3 SPEAKER
12. INSPECT REAR SPEAKER





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






NG -- REPLACE REAR SPEAKER
OK -- Continue to next step.
13. INSPECT WOOFER BOX SPEAKER





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

Standard Resistance:






NG -- REPLACE WOOFER BOX SPEAKER
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
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