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 Owners Manual > Steps to take in an
emergency: If your vehicle overheats
The following may indicate that your vehicle is overheating: The needle of the engine coolant temperature gauge enters the red zone or a loss of engine power is experienced. (For example, the vehicle speed does not increase.) "ENGINE COOLANT OVERTEMP" is shown on the multi-information display. Stea ...
