LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> SC 430 >> Repair and Diagnosis >> Body & Frame >> Exterior/Interior Trim >> Multiplex Communication >> Multiplex Communication System >> DTC B1278 Combination Switch ECU Communication Stop >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B1278 Combination Switch ECU Communication Stop: Description

This DTC is detected when communication between the turn signal switch (combination switch) and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

DTC No. DTC Detection Condition Trouble Area
B1278 Combination switch ECU communication stop
  • Turn signal switch
  • Wire harness
scientia non olet · About LEMON Manuals