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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (4 Of 4) & Symptom Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC C1447: External System Malfunction [12/2017 - 09/2018] >> Description

DTC C1447: External System Malfunction [12/2017 - 09/2018]: Description

The skid control ECU (brake actuator assembly) acquires the steering sensor zero point every time the engine switch is turned on (IG) and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The ECU also stores previous zero points.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1447 External System Malfunction Due to the VGRS system calibration request, the steering sensor zero point value has been cleared.
  • Speed sensor
  • Steering sensor
  • Yaw rate sensor
  • VGRS ECU (front steering control ECU)
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