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Home >> Lexus >> 2019 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Smart Access System (For Start) - Diagnostic Codes (1 Of 2) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) >> DTC B2278-62: Engine/Power Switch Signal Compare Failure [10/2023 - ] >> Description

DTC B2278-62: Engine/Power Switch Signal Compare Failure [10/2023 - ]: Description

This DTC is stored when the SSW1 contact signal, SSW2 contact signal and SSW3 contact signal, which are detected when the engine switch is operated, do not match.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority Note
B2278-62 Engine/Power Switch Signal Compare Failure When the engine switch is operated, the SSW1 contact signal, SSW2 contact signal and SSW3 contact signal do not match.
  • Engine switch
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
Power Source Control A DTC Output Confirmation Operation: 
  1. Turn the ignition switch to ON.
VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
If there is a malfunction in only one of the terminals SS1, SS2 or SS3, the system can still operate normally. When only one terminal malfunctions, that terminal is disabled and the system operates normally.
RELATED DATA LIST AND ACTIVE TEST ITEMS

DTC No. Data List and Active Test
B2278-62 Power Source Control 
  • Push Start Switch 1
  • Push Start Switch 2
  • Push Start Switch 3