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 > Brake Control / Dynamic Control Systems: Stop Light Control Relay
On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE 1. CHECK STOP LIGHT CONTROL RELAY (a) Remove the stop light control relays (BRK NO. 1) from the engine room relay block. (b) Measure the resistance according to the value(s) in the table below. Standard resistance: for BRK NO. 1 Tester Connection ...