Pre-Collision System

PRE-COLLISION: PRE-COLLISION SYSTEM: U0122,U0123,U0126,U0140,U0151,U0155,U0235,U0293,U1104,U1121: Lost Communication with Vehicle Dynamics Control Module
U1121 - Lost Communication with Driver Monitor ECU

DESCRIPTION

The driving support ECU uses the front millimeter wave radar sensor, driver monitor camera and object recognition camera to detect obstacles in front of and behind the vehicle, and detect the direction that the driver's head is facing. Based on this information, the driving support ECU sends pre-collision control operation signals.

This DTC is output when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-collision control.





INSPECTION PROCEDURE

Refer to CAN communication system DTC U0122 U0122.

Refer to CAN communication system DTC U0123 U0123.

Refer to CAN communication system DTC U0126 U0126.

Refer to CAN communication system DTC U0151 Problem Symptoms Table.

Refer to CAN communication system DTC U0155 U0155.

Refer to CAN communication system DTC U0235 U0235.

Refer to CAN communication system DTC U0293 U0293.

Refer to CAN communication system DTC U1104 U1104.

Refer to CAN communication system DTC U1121 U1121.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Select "Bus Check" from the "System Select" Diagnosis System.

(b) Select "Communication Malfunction DTC" from the "Bus Check" screen, and then select "Enter" Diagnosis System.

Result





B -- GO TO CAN COMMUNICATION SYSTEM CAN Communication System

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting