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
Radio Broadcast cannot be Received or Poor Reception
INSPECTION PROCEDURE
1 CHECK RADIO RECEIVER
Check the radio's automatic station search function.
Check the radio's automatic station search function
by activating it.
OK:
The ra ...
Vehicle Speed Signal Circuit between Radio Receiver and Combination
Meter
DESCRIPTION
This circuit is necessary for the ASL (Auto Sound Leveliser) built into the
radio receiver.
Speed signals are received from the combination meter and used for the ASL.
The ASL fun ...
Other materials:
Lubrication system
On-vehicle inspection
1. CHECK ENGINE OIL LEVEL
(a) Warm up the engine, stop it and wait 5 minutes. The
oil level should be between the dipstick's low level
mark and full level mark.
If the engine oil level is low, check for leakage and
add oil up to the full level mark.
NOTICE:
D ...
CAN Bus Line
DESCRIPTION
When any DTC for the CAN communication system is output, first measure the
resistance between the
terminals of the DLC3 to specify the trouble area, and check that there is no
short in the CAN main wire,
between the main wire, and +B or GND.
WIRING DIAGRAM
INSPECTION PRO ...
Warning lights and
indicators
The warning lights and indicators on the instrument cluster and
center panel inform the driver of the status of the vehicle’s various
systems.
For the purpose of explanation, the following illustration displays
all warning lights and indicators illuminated.
Vehicles with monochrome displ ...
