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 > Sliding Roof System: Terminals Of Ecu
TERMINALS OF ECU 1. SLIDING ROOF DRIVE GEAR (SLIDING ROOF ECU) (a) Disconnect the W3 ECU connector. (b) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition W3-1 (UP) - Body ground BR - ...