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 > Lin Communication System: Terminals Of Ecu
TERMINALS OF ECU *A Main Body ECU (Multiplex Network Body ECU) with 1 connector - - *1 Main Body ECU (Multiplex Network Body ECU) - - *A Main Body ECU (Multiplex Network Body ECU) with 3 connectors - - *1 Main Body ECU (Multiplex Network Body ECU) - - 1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND ...
