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 > Occupant Classification System: Terminals Of Ecu
TERMINALS OF ECU 1. CHECK OCCUPANT CLASSIFICATION ECU Terminal No. (Symbols) Wiring Color Terminal Description Condition Specification Y2-1 (+B) - Y2-3 (GND) W - W-B Battery Ignition switch ON 11 to 14 V Y2-2 (DIA) - Y2-3 (GND) GR - W-B Diagnosis (DLC3) Ignition switch ON Pulse generation Y2-3 (GND) ...
