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Home >> Toyota >> 2021 >> Highlander LE, FWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Road Sign Assist System - Diagnostic Codes >> Road Sign Assist System >> DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0126-87: Lost Communication with Steering Angle 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; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0293-87: Lost Communication with Hybrid Powertrain Control Module Missing Message [11/2023 - ] >> Description
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DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0126-87: Lost Communication with Steering Angle 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; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0293-87: Lost Communication with Hybrid Powertrain Control Module Missing Message [11/2023 - ]: 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 3 seconds or more after the ignition switch is turned to ON, 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
U0101-87 Lost Communication with TCM Missing Message After 3 seconds or more have elapsed since turning the road sign assist system on and the ignition switch to ON, a communication malfunction between the forward recognition camera and the hybrid vehicle control ECU*1 or ECM*2 is continuously detected for 5 seconds or more. CAN communication system
U0126-87 Lost Communication with Steering Angle Sensor Module Missing Message After 3 seconds or more have elapsed since turning the road sign assist system on and the ignition switch to ON, a communication malfunction between the forward recognition camera and the steering sensor is continuously detected for 5 seconds or more. CAN communication system
U0129-87 Lost Communication with Brake System Control Module Missing Message 3 seconds or more after the ignition switch is turned to ON, while the road sign assist system is on, a communication error between the No. 2 skid control ECU (brake actuator assembly)

*1 or skid control ECU (brake actuator assembly)

*2 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 3 seconds or more after the ignition switch is turned to ON, 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 3 seconds or more after the ignition switch is turned to ON, 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
U0163-87 Lost Communication with Navigation Control Module Missing Message After 3 seconds or more have elapsed since turning the road sign assist system on and the ignition switch to ON, a communication malfunction between the forward recognition camera and the navigation system is continuously detected for 5 seconds or more. CAN communication system
U0293-87 Lost Communication with Hybrid Powertrain Control Module Missing Message After 3 seconds or more have elapsed sinceturning the road sign assist system on and the ignition switch to ON, a communication malfunction between the forward recognition camera and the hybrid vehicle control ECU is continuously detected for 5 seconds or more. CAN communication system
  1. *1: for HV Model
  2. *2: for Gasoline Model