FixVault

DTC Detection Logic

DTC (On board display) Trouble diagnosis name DTC detection condition Possible causes
C1A40 (40) SYSTEM SW CIRC If the IBA OFF switch is stuck to ON
  • IBA OFF switch circuit
  • IBA OFF switch
  • Brake booster control unit
NOTE: If DTC "C1A40" is displayed along with DTC "U1000", first diagnose the DTC "U1000". Refer to "DTC LOGIC ".