SYSTEM DIAGRAM 
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Smart Key System(for Start Function, Gasoline Model): Engine/Power Switch Malfunction (B2278)
DESCRIPTION This DTC is stored when the SSW1 contact signal and SSW2 contact signal, which are detected when the engine switch is operated, do not match. DTC No. Detection Item DTC Detection Condition Trouble Area Note B2278 Engine/Power Switch Malfunction When the engine switch is operated, the SSW ...
