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 CAN Communication System.

Refer to CAN communication system DTC U0123 CAN Communication System.

Refer to CAN communication system DTC U0126 CAN Communication System.

Refer to CAN communication system DTC U0151 CAN Communication System.

Refer to CAN communication system DTC U0155 CAN Communication System.

Refer to CAN communication system DTC U0235 CAN Communication System.

Refer to CAN communication system DTC U0293 CAN Communication System.

Refer to CAN communication system DTC U1104 CAN Communication System.

Refer to CAN communication system DTC U1121 CAN Communication System.

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