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Home >> Lexus >> 2020 >> RC 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Stability Control System - Diagnostic Codes (5 Of 5), Symptoms & Circuit Tests >> Vehicle Stability Control System >> DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0134: Lost Communication with DRS Module [11/2017 - 09/2020] >> Description
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DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0134: Lost Communication with DRS Module [11/2017 - 09/2020]: Description

The skid control ECU (brake actuator assembly) receives signals from the ECM, steering angle sensor, yaw rate and acceleration sensor, VGRS ECU (front steering control ECU) and DRS ECU (rear steering control ECU) via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0073 Control Module Communication Bus Off Any of the following is detected:
  1. A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession. (Sent signals cannot be received.)
  2. When the +BS terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor, steering angle sensor, VGRS ECU (front steering control ECU) (w/ VGRS system) and DRS ECU (rear steering control ECU) (w/ DRS system) continues for 1 second or more.
  3. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • A delay in receiving data from the yaw rate and acceleration sensor, steering angle sensor, VGRS ECU (front steering control ECU) (w/ VGRS system) and DRS ECU (rear steering control ECU) (w/ DRS system) occurs more than once within 5 seconds.
 CAN communication system
U0100 Lost Communication With ECM/PCM "A" When the +BS terminal voltage is between 10 and 17.4 V, and the vehicle speed is 15 km/h (9 mph) or more, data cannot be received from the ECM for 2 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM
U0124 Lost Communication With Lateral Acceleration Sensor Module Either of the following is detected:
  1. When the +BS terminal voltage is between 10 and 17.4 V, and the vehicle speed is 7 km/h (4 mph) or more, data from the acceleration sensor cannot be received for 1 second or more.
  2. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds.
    • The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Acceleration sensor (yaw rate and acceleration sensor)
U0126 Lost Communication With Steering Angle Sensor Module Either of the following is detected:
  1. When the +BS terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more.
  2. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    • The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Steering angle sensor
U0130 Lost Communication with Steering Effort Control Module Either of the following is detected:
  1. When the +BS terminal voltage is between 10 and 17.4 V, data from the VGRS ECU (front steering control ECU) cannot be received for 1 second or more.
  2. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • Data from the VGRS ECU (front steering control ECU) cannot be received once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • VGRS ECU (front steering control ECU)
U0134 Lost Communication with DRS Module Either of the following is detected:
  1. When the +BS terminal voltage is between 10 and 17.4 V, data from the DRS ECU (rear steering control ECU) cannot be received for 1 second or more.
  2. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • Data from the DRS ECU (rear steering control ECU) cannot be received once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • DRS ECU (rear steering control ECU)
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