PROCEDURE
(a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: Malfunction disappears. HINT: Sound quality adjustment measures vary according to the type of amplifier.
(a) Compare with another vehicle of the same model which does not have trouble to see if there is any difference in the sound quality. OK: No difference is found.
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Toyota Tundra Service Manual > Theft Deterrent System: Horn Circuit
DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horn to sound at intervals of 0.4 seconds. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for cir ...
