OPERATION CHECK CHECK LANE DEPARTURE ALERT MAIN SWITCH (STEERING PAD SWITCH ASSEMBLY) (a) Check the lane departure alert main switch (steering pad switch assembly) on/off operation. (1) Turn the power switch on (IG). (2) Confirm that the lane departure alert indicator (white) 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 (w/ steering control) remains unchanged when the power switch is turned off and back to on (IG). 
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Audio And Visual System(for Gasoline Model): Microphone Circuit
DESCRIPTION w/o Manual (SOS) Switch: The radio and display receiver assembly, roof console box sub-assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines. Using this circuit, the radio and display receiver assembly sends power to ...
