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 > Do-it-yourself maintenance: Wireless remote control
battery
Replace the battery with a new one if it is depleted. You will need the following items: Flathead screwdriver Small flathead screwdriver Lithium battery CR2016 Replacing the battery 1. Remove the cover. To prevent damage to the key, cover the tip of the screwdriver with a rag. To prevent the button ...
