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Home >> Lexus >> 2019 >> GS 350 Base, RWD >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Pre-Collision System - Diagnostic Codes & Circuit Tests >> Pre-Collision System >> DTC C1A4B: Stop Light Relay Circuit [10/2015 - 09/2017] >> Caution / Notice / Hint
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Caution / Notice / Hint

NOTE:
  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After replacing the brake actuator assembly (skid control ECU), perform zero point calibration and store the system information.

    Refer to CALIBRATION [10/2015 - ]

  • When this DTC is output, a malfunction in the lighting system is suspected. Check if the lighting system is functioning normally.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]

  • The pre-collision system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]

  • When the start function does not operate, check the smart access system with push-button start (for start function).

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ]