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 > Seat Belt Warning System: Terminals Of Ecu
TERMINALS OF ECU 1. CHECK COMBINATION METER ASSEMBLY (a) Disconnect the J28 combination meter assembly connector. (b) Disconnect the J28 combination meter assembly connector. (c) Measure the resistance and voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Termi ...
