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Home >> Lexus >> 2007 >> IS 350 >> Repair and Diagnosis >> Electrical >> Starter >> Starting (2GR-FSE) >> Smart Access System With Push-Button Start >> DTC B2278 Engine Switch Circuit Malfunction >> Description
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DTC B2278 Engine Switch Circuit Malfunction: Description

This DTC is output when 1) a malfunction is detected between the power source control ECU and the engine switch; or 2) either of the switches inside the engine switch is malfunctioning.

DTC DETECTION CONDITION CHART

DTC No. DTC Detection Condition Trouble Area
B2278 Communication is abnormal between the power source control ECU and engine switch or the engine switch is defective
  • Power source control ECU
  • Engine switch
  • Wire harness
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