LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Starting >> Smart Access System With Push-Button Start >> DTC B2278 Engine Switch Circuit Malfunction >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B2278 Engine Switch Circuit Malfunction: Description

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

DIAGNOSTIC TROUBLE CODE CHART

DTC Code Detection Condition Trouble Area
B2278 Communication is abnormal between main body ECU and engine switch or engine switch is defective
  • Main body ECU
  • Engine switch
  • Harness or connector
scientia non olet · About LEMON Manuals