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Home >> Lexus >> 2021 >> RX 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Cruise Control Systems >> Road Sign Assist System - Diagnostic Codes >> Road Sign Assist System >> DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message [08/2019 - ] >> Description
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DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message [08/2019 - ]: Description

When a malfunction is detected between various ECUs and sensors, these DTCs are stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100-87 Lost Communication with ECM/PCM "A" Missing Message 2 seconds or more after the engine switch is turned on (IG), while the vehicle is being driven at 1 km/h or 1 mph or more and the road sign assist system is on, a communication error between the ECM and the forward recognition camera is detected for approximately 5 seconds or more. CAN communication system
U0125-87 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message While the vehicle is being driven at 1 km/h or 1 mph or more and the road sign assist system is on, a communication error between the yaw rate sensor assembly*1 or airbag sensor assembly*2 and the forward recognition camera is detected for approximately 5 seconds or more. CAN communication system
U0129-87 Lost Communication with Brake System Control Module Missing Message 2 seconds or more after the engine switch is turned on (IG), while the vehicle is being driven at 1 km/h or 1 mph or more and the road sign assist system is on, a communication error between the skid control ECU (brake actuator assembly) and the forward recognition camera is detected for approximately 5 seconds or more. CAN communication system
U0140-87 Lost Communication with Body Control Module Missing Message 2 seconds or more after the engine switch is turned on (IG), while the road sign assist system is on, a communication error between the main body ECU (multiplex network body ECU) and the forward recognition camera is detected for approximately 5 seconds or more. CAN communication system
U0155-87 Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message 2 seconds or more after the engine switch is turned on (IG), while the road sign assist system is on, a communication error between the combination meter assembly and the forward recognition camera is detected for approximately 50 seconds or more. CAN communication system
  1. *1: for TFT Meter Type
  2. *2: for Optitron Meter Type