OPERATION CHECK CHECK LANE DEPARTURE ALERT MAIN SWITCH (a) Check the lane departure alert main switch (steering pad switch assembly) on/off operation. (1) Turn the ignition switch to ON. (2) Confirm that the lane departure alert indicator (green) in the combination meter assembly illuminates or turns off when the lane departure alert main switch (steering pad switch assembly) is pressed. HINT: The ON/OFF status of the lane departure alert system remains unchanged when the ignition switch is turned off and back to ON. 
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Toyota Tundra Service Manual > Instrument Panel Speaker(for Double Cab): Inspection
INSPECTION PROCEDURE 1. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY (a) When there is a malfunction such as noise from a speaker or no sound at all, replace the speaker with a new one and check that the malfunction disappears. OK: Malfunction disappears. HINT: Connect the connectors to the front No. 2 spea ...
