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 > Trailer Brake Control System: Gain Rocker Switch (+) Circuit (C14A1,C14A2)
DESCRIPTION DTC No. Detection Item INF Code DTC Detection Condition Trouble Area C14A1 Gain Rocker Switch (+) Circuit 21 With the ignition switch turned to ON and the IG terminal voltage from 11 to 14 V, an open circuit occurs continuously in the GAIN (+) selection button internal circuit or wire ha ...

Toyota Tundra Owners Manual