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Home >> Lexus >> 2018 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Steering >> Power Steering >> Variable Gear Ratio Steering System - Diagnostics - Introduction >> Variable Gear Ratio Steering System >> Problem Symptoms Table [12/2017 - 10/2023] >> Problem Symptoms Table [12/2017 - 10/2023]

Problem Symptoms Table [12/2017 - 10/2023]

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VGRS SYSTEM

Symptom Suspected Area Link
Steering wheel is off-center Steering wheel is off-center or deviates from neutral position Refer to Steering Wheel is Off-center or Deviates from Neutral Position [12/2017 - 10/2023]
VGRS system stops or does not operate Actuator temperature is abnormal Refer to VGRS System Stops or does not Operate [12/2017 - 10/2023]
IG power source circuit Refer to DTC C15C6: IG Power Supply Voltage [12/2017 - 10/2023]
PIG power supply circuit Refer to DTC C15C7: DC Motor Power Source Voltage; DTC C15C8: DC Motor Power Source Voltage(ECU Start-up) [12/2017 - 10/2023]
Steering system (Hard steering) Refer to PROBLEM SYMPTOMS TABLE [12/2017 - 10/2020] , or refer to PROBLEM SYMPTOMS TABLE [10/2020 - 10/2023]
If the symptoms still occur even after the above suspected areas have been inspected and proved to be normal, replace the VGRS ECU (front steering control ECU). Refer to REMOVAL [12/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]
Steering angle differs between left and right Steering angle differs between left and right Refer to Steering Angle Differs between Left and Right [12/2017 - 10/2023]
VGRS system suspends right after engine start VGRS system suspends right after engine start Refer to VGRS System Suspends right after Engine Start [12/2017 - 10/2023]
Steering wheel vibrates or abnormal noise is heard from steering wheel Steering actuator assembly -
Rack and pinion power steering gear assembly -
Steering column assembly -
Master warning light malfunction Combination meter assembly Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 10/2023]
VGRS ECU (Front steering control ECU) Refer to TERMINALS OF ECU [12/2017 - 10/2023] 
CAN communication system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 10/2023]