Toyota PT546-00140, Troubleshooting Manual

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2 GENERAL One or more speakers do not work.
Is there continuity in the speaker wire
harness?
Temporarily install another speaker.
Is the function OK?
Head unit faulty.
Speaker wire harness faulty.
Speaker faulty.
Yes
No
No
Yes
No
Yes
Check volume control.
Check fade, balance settings.
Check for proper connection to head unit.
Head unit faulty.
Yes
No
No
Yes
Yes
No
Head unit faulty.
Please connect proper to head unit.
Do non-functioning speakers produce hiss?
Head unit faulty.