Lexus IS250 IS220d GSE20 ALE20 - NAVIGATION
INSPECT STEREO COMPONENT AMPLIFIER
INSPECT FRONT NO. 1 SPEAKER (LEFT HAND)
INSPECT REAR NO. 2 SPEAKER (RIGHT HAND)
INSPECT REAR NO. 2 SPEAKER (LEFT HAND)
INSPECT REAR NO. 3 SPEAKER (RIGHT HAND)
INSPECT REAR NO. 3 SPEAKER (LEFT HAND)
INSPECT REAR STEREO COMPONENT SPEAKER (LEFT HAND)
INSPECT REAR STEREO COMPONENT SPEAKER (RIGHT HAND)
INSPECT FRONT STEREO COMPONENT SPEAKER
INSPECT FRONT NO. 1 SPEAKER (RIGHT HAND)
INSPECT FRONT NO. 2 SPEAKER (RIGHT HAND)
INSPECT FRONT NO. 2 SPEAKER (LEFT HAND)
INSPECT FRONT NO. 3 SPEAKER (RIGHT HAND)
INSPECT FRONT NO. 3 SPEAKER (LEFT HAND)
INSPECT REAR NO. 2 SPEAKER (RIGHT HAND)
INSPECT REAR NO. 2 SPEAKER (LEFT HAND)
INSPECT REAR SPEAKER (RIGHT HAND)
INSPECT REAR SPEAKER (LEFT HAND)
DTC 74-40 Short in Speaker Circuit
DESCRIPTION
| DTC No. | DTC Detection Condition | Trouble Area |
| 74-40 | A short is detected in the speaker output circuit. | Wire harness Speaker Stereo component amplifier |
This circuit has a fail-safe function.
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- After the inspection is completed, clear the DTCs.
| 1.INSPECT STEREO COMPONENT AMPLIFIER |
Disconnect the stereo component amplifier connectors P29 and P28.
Clear the DTCs and recheck for DTCs.
Check if DTC 74-40 is output.
- OK:
- DTC 74-40 is not output.
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR |
Disconnect the connectors shown in the illustration from the stereo component amplifier and speakers.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection Condition Specified condition CTR+ - Body ground (*1) Always 10 kΩ or higher CTR- - Body ground (*1) Always 10 kΩ or higher ML+ - Body ground (*2) Always 10 kΩ or higher ML- - Body ground (*2) Always 10 kΩ or higher O4-2 - Body ground (*2) Always 10 kΩ or higher O4-4 - Body ground (*2) Always 10 kΩ or higher MR+ - Body ground (*2) Always 10 kΩ or higher MR- - Body ground (*2) Always 10 kΩ or higher N4-2 - Body ground (*2) Always 10 kΩ or higher N4-4 - Body ground (*2) Always 10 kΩ or higher SL+ - Body ground (*1) Always 10 kΩ or higher SL- - Body ground (*1) Always 10 kΩ or higher SR+ - Body ground (*1) Always 10 kΩ or higher SR- - Body ground (*1) Always 10 kΩ or higher WFL+ - Body ground Always 10 kΩ or higher WFL- - Body ground Always 10 kΩ or higher WF2+ - Body ground (*2) Always 10 kΩ or higher WF2- - Body ground (*2) Always 10 kΩ or higher WF1+ - Body ground Always 10 kΩ or higher WF1- - Body ground Always 10 kΩ or higher
*1: with Front Center Speaker
*2: without Front Center Speaker
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| A | |
| 6.INSPECT REAR NO. 2 SPEAKER (RIGHT HAND) |
Reconnect the stereo component amplifier connector and rear No. 2 speaker connector.
Check that audio sound can be heard from the speaker.
- OK:
- Audio sound can be heard.
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| NG | ||
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| 10.INSPECT REAR STEREO COMPONENT SPEAKER (LEFT HAND) |
Reconnect the stereo component amplifier connector and rear stereo component speaker connector.
Check that audio sound can be heard from the speaker.
- OK:
- Audio sound can be heard.
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| A | |
| 21.INSPECT REAR NO. 2 SPEAKER (RIGHT HAND) |
Reconnect the stereo component amplifier connector and rear No. 2 speaker connector.
Check that audio sound can be heard from the speaker.
- OK:
- Audio sound can be heard.
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| OK | |
| 22.INSPECT REAR NO. 2 SPEAKER (LEFT HAND) |
Reconnect the stereo component amplifier connector and rear No. 2 speaker connector.
Check that audio sound can be heard from the speaker.
- OK:
- Audio sound can be heard.
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| OK | |
| 23.INSPECT REAR SPEAKER (RIGHT HAND) |
Reconnect the stereo component amplifier connector and rear speaker connector.
Check that audio sound can be heard from the speaker.
- OK:
- Audio sound can be heard.
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| OK | ||
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| 24.INSPECT REAR SPEAKER (LEFT HAND) |
Resistance check.
Measure the resistance between the terminals of the speaker.
- Standard resistance:
- Approximately 4 Ω
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| OK | ||
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