Toyota Tundra Service Manual: Poor Sound Quality in All Modes (Low Volume)

PROCEDURE

1.	CHECK AUDIO SETTINGS

(a) Set treble, middle and bass to the initial values and check that the sound is normal.

OK:

The sound returns to normal.

END (AUDIO SETTINGS ARE DEFECTIVE)

2.	COMPARE WITH ANOTHER VEHICLE OF SAME MODEL

(a) Compare with another vehicle of the same model which is not malfunctioning to see if there is any difference in the sound quality.

OK:

No difference is found.

END (AUDIO SETTINGS ARE DEFECTIVE)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Toyota Tundra Service Manual > Air Conditioning System(for Automatic Air Conditioning System): Passenger Side Cool Air Bypass Damper Control (B1445/45)
DESCRIPTION HINT: Although the tester title says "Passenger Side", there is only one cool air bypass servo motor on this vehicle. The cool air bypass servo motor sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates th ...

Toyota Tundra Owners Manual