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Home >> Lexus >> 2020 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Steering >> Steering Control Systems >> Dynamic Rear Steering System - Diagnostic Codes & Symptom Tests >> Dynamic Rear Steering System >> DTC U0100-87: HEG Communication Error (CAN) (ADS_C1-Bus) Communication is Lost; DTC U0129-87: Lost Communication With Brake System Control Module Missing Message; DTC U0131-87: Lost Communication With Power Steering Control Module Missing Message [10/2023 - ] >> Description
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DTC U0100-87: HEG Communication Error (CAN) (ADS_C1-Bus) Communication is Lost; DTC U0129-87: Lost Communication With Brake System Control Module Missing Message; DTC U0131-87: Lost Communication With Power Steering Control Module Missing Message [10/2023 - ]: Description

In order to prevent abnormal operation, the rear steering link assembly monitors CAN communication of the ECM, skid control ECU, and EPS ECU.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate DTC Output from Priority
U0100-87 HEG Communication Error (CAN) (ADS_C1-Bus) Communication is Lost CAN communication from the ECM is interrupted
  • CAN communication system
  • Rear steering link assembly
  • ECM
 Displayed on MID DRS B
U0129-87 Lost Communication With Brake System Control Module Missing Message CAN communication from the skid control ECU is interrupted
  • CAN communication system
  • Rear steering link assembly
  • Skid control ECU (brake actuator assembly)
 Displayed on MID DRS B
U0131-87 Lost Communication With Power Steering Control Module Missing Message CAN communication from the EPS ECU is interrupted
  • CAN communication system
  • Rear steering link assembly
  • Power steering ECU (rack and pinion power steering gear assembly)
 Displayed on MID DRS B
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