Toyota Sienna Service Manual: Poor Sound Quality in All Modes (Low Volume)
INSPECTION PROCEDURE
1 CHECK AUDIO SETTINGS
- Set "BASS", "MID" and "TREB" to the initial values and check that sound is normal.
OK: Malfunction disappears.
2 COMPARE WITH ANOTHER VEHICLE OF SAME MODEL
- Compare with another vehicle of the same model.
- Compare with another vehicle of the same model which does not have trouble to see if there is any difference in the sound quality.
OK: No difference is found
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
Screen Flicker or Color Distortion
INSPECTION PROCEDURE
1 CHECK DISPLAY SETTING
Enter the display adjustment screen by pressing the
"DISPLAY" switch.
Reset display settings (contrast, brightness) and check
...
Map Disc cannot be Inserted
INSPECTION PROCEDURE
1 CHECK RADIO AND NAVIGATION ASSEMBLY
Check if a disc is inserted into the MAP disc slot.
Check if "DISC IN" is displayed.
OK:
"DISC IN&quo ...
Other materials:
On-vehicle inspection
1. CHECK POWER SEAT FUNCTION
Check the basic functions.
Operate the power seat switches and check the
following seat functions:
Sliding
Reclining
Front vertical (Driver side seat only)
Lifter (Driver side seat only)
Lumbar suppo ...
Sound setting
Display the “Phone/Message Settings” screen.
Select “Sound Settings” on the “Phone/Message Settings” screen.
Set the desired ringtone.
Adjust the ringtone volume.
Adjust the message readout
volume.
Set the desired incoming
SMS/MMS tone.
Adjust the incoming SMS ...
Rear speaker
COMPONENTS
ON-VEHICLE INSPECTION
1. INSPECT REAR SPEAKER
HINT:
Remove interior parts so that the rear speaker can be
seen.
Check the speaker installation.
OK:
The speaker is securely installed.
If the result is not as specified, reinstall the rear
speaker.
Vi ...
