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 > Intuitive Parking Assist System: Indicator Circuit
DESCRIPTION The sonar ON/OFF indicator light and warning indicator lights are installed in the combination meter assembly. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - COMBINATION METER ASSEMBLY) (a) Disconnect the J35 clearance warning ECU assembly conne ...
