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 > Rear Door Lock(for Double Cab): Inspection
INSPECTION PROCEDURE 1. INSPECT REAR DOOR LOCK ASSEMBLY LH (a) Check the door lock motor. (1) Apply battery voltage to the door lock and check operation of the door lock. OK: Measurement Condition Specified Condition Battery positive (+) → Terminal 4 (L) Battery negative (-) → Terminal 1 (UL) Lo ...