The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to troubleshoot when, during a DTC check, a "Normal" code is displayed but the problem is still occurring. Numbers in the table show the inspection order in which the circuits or parts should be checked.
HINT: In some cases, the problem is not detected by the diagnostic system even though a problem symptom is present. It is possible that the problem is occurring outside the detection range of the diagnostic system, or that the problem is occurring in a completely different system.

Diagnostic trouble code chart
Circuit inspectionCustomization
Your vehicle includes a variety of electronic features that can be
personalized to your preferences. The settings of these features
can be changed by the meter control switches, on the audio system
screen or at your toyota dealer.
Customizing vehicle features (audio system screen)
Audio system ...