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 > Vehicle Stability Control System: Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Vehicle Stability Control System DTC No. Detection Item Link C1201 Engine Control System Malfunction C1225 SM Solenoid Circuit C1226 SA2 Solenoid Circuit C1227 SA3 Solenoid Circuit C1228 STR Solenoid Circuit C1234 Yaw Rate Sensor C1237 Speed Sensor Rotor Faulty C1241 Lo ...
