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Home >> Lexus >> 2017 >> LS 460 Base, AWD >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Pre-Collision System (W/ Driver Monitor Camera) - Diagnostic Codes >> PRE-COLLISION SYSTEM(w/ Driver Monitor Camera) >> DTC C1A6A: Infrared Signal Circuit [09/2015 - ] >> Description

DTC C1A6A: Infrared Signal Circuit [09/2015 - ]: Description

If a headlight assembly illumination malfunction or automatic light sensor signal malfunction is detected, or the near infrared ray filter position signal, near infrared light signal input from the headlight assembly indicate an open circuit, a signal is sent to the driving support ECU and DTC C1A6A is output.

DTC Code DTC Detection Condition Trouble Area
C1A6A When one of the following conditions is met while the engine switch is on (IG):
  • An automatic light control sensor signal malfunction continues for 3 seconds or more.
  • An automatic light control sensor communication stop malfunction occurs.
  • A headlight assembly combination signal malfunction continues for 10 seconds or more.
  • Near infrared light open circuit.
  • A light failure indicator sensor open circuit between body ground continues for 30 seconds or more.
  • The wire harness between the object recognition ECU and headlight assembly has an open or short circuit for 30 seconds or more.
  • The type of infrared ray light that is learned is incorrect.
  • Lighting system
  • CAN communication system
  • Harness or connector
  • Headlight unit
  • Object recognition ECU
  • Front multiplex network light ECU
NOTE:

After replacing the object recognition ECU, if the headlight assembly is not connected when the engine switch is turned on (IG), the ECU records the wrong headlight type and outputs DTC C1A6A.

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