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 > Heated Oxygen Sensor: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. CHECK HEATED OXYGEN SENSOR (a) Disconnect the heated oxygen sensor connector. (b) Measure the heater resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 1 (HT1B) - 2 (+B) (for Bank 1) 20°C ( ...
