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 > Sfi System: Engine Coolant Temperature / Intake Air Temperature Correlation (P011B)
DESCRIPTION The engine has two temperature sensors, an Engine Coolant Temperature (ECT) sensor and an Intake Air Temperature (IAT) sensor, to detect temperature while the engine is in operation. A thermistor, whose resistance value varies according to temperature, is built into each sensor. When the ...
