PROCEDURE
(a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: The sound returns to normal.
(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.
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Toyota Tundra Service Manual > Headlight Leveling Switch: Inspection
INSPECTION PROCEDURE 1. INSPECT HEADLIGHT LEVELING SWITCH (a) Check the voltage. (1) Connect the battery positive (+) lead to terminal 1 (B) and the negative (-) lead to terminal 5 (E). (2) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Switch C ...