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Home >> Lexus >> 2015 >> GS 450h Base >> Repair and Diagnosis (Single Page) >> Steering >> Power Steering >> Variable Gear Ratio Steering System (Diagnostic Codes & Symptom Tests) >> Variable Gear Ratio Steering System >> DTC C1595/55: Lost Communication with Steering Angle Sensor Module (SIL); DTC C15C4/68: Steering Signal Not Detected [09/2014 - ] >> Description
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DTC C1595/55: Lost Communication with Steering Angle Sensor Module (SIL); DTC C15C4/68: Steering Signal Not Detected [09/2014 - ]: Description

Signal transmission between the VGRS ECU (front steering control ECU) and steering sensor is performed via serial communication.

If a serial communication error occurs between the VGRS ECU (front steering control ECU) and steering sensor, the ECU stores DTC C1595/55.

The test mode DTC C15C4/68 is only stored during test mode.

DTC Code DTC Detection Condition Trouble Area
C1595/55 The VGRS ECU (front steering control ECU) detects a serial communication error between the ECU and steering sensor.
  • Steering sensor
  • VGRS ECU (front steering control ECU)
  • Harness or connector
C15C4/68 The system enters test mode.
  • Steering sensor
  • VGRS ECU (front steering control ECU)
  • Harness or connector