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 > Automatic Transmission System: Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (complying with SAE J1978). Various data output from the vehicle's ECM can then be read. (b) OBD II regulations require that the vehicle's on-board co ...