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Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Dynamic Radar Cruise Control System - Diagnostic Codes & Circuit Tests >> Dynamic Radar Cruise Control System >> DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1104: Lost Communication with Driving Support ECU [09/2014 - 11/2017] >> Description
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DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1104: Lost Communication with Driving Support ECU [09/2014 - 11/2017]: Description

The driving support ECU assembly sends vehicle speed and vehicle condition information to the millimeter wave radar sensor assembly. The millimeter wave radar sensor assembly then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU assembly. The driving support ECU assembly sends this information to the ECM and performs dynamic radar cruise control system operation.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0235 Lost Communication with Cruise Control Front Distance Range Sensor When the cruise control switch is on and the vehicle is being driven at a speed of 36 km/h (22 mph) or more, a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second.
  • CAN communication system
  • Millimeter wave radar sensor assembly
  • Driving support ECU assembly
U1104 Lost Communication with Driving Support ECU When the cruise control switch is on and the vehicle is being driven at a speed of 36 km/h (22 mph) or more, a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 1 second.
  • CAN communication system
  • Millimeter wave radar sensor assembly
  • Driving support ECU assembly