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Home >> Lexus >> 2015 >> IS 250 Base, AWD >> Repair and Diagnosis (Single Page) >> Steering >> Manual 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 [04/2013 - 10/2016] >> Description
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DTC C1595-55: Lost Communication with Steering Angle Sensor Module(SIL); DTC C15C4-68: Steering Signal Not Detected [04/2013 - 10/2016]: 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 No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1595-55 Lost Communication with Steering Angle Sensor Module(SIL) With the engine switch on (IG) and a power source voltage of 10 V or more, serial communication from the steering sensor is interrupted for 3 seconds or more.
  • Steering sensor
  • VGRS ECU (front steering control ECU)
  • Harness or connector
Comes on Engine switch on (IG) again
C15C4-68 Steering Signal Not Detected The system enters test mode.
  • Steering sensor
  • VGRS ECU (front steering control ECU)
  • Harness or connector
- Test mode code