DTC U1002: Lost Communication with Gateway Module (Sensor Bus) [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

The driving support ECU assembly will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to sub bus 13.
When the driving support ECU assembly receives a response signal from the ECUs connected to sub bus 13, the driving support ECU assembly recognizes and memorizes that the ECU is connected to sub bus 13. Based on this memorized data, the driving support ECU assembly monitors for malfunctions in the ECUs connected to sub bus 13 when communicating with those ECUs. If the driving support ECU assembly cannot receive response signals from the ECUs that have been memorized as those connected to sub bus 13, the driving support ECU assembly determines that a malfunction exists.

DTC No.	DTC Detection Condition	Trouble Area
U1002	The driving support ECU assembly cannot receive signals from all ECUs that have been memorized as those connected to sub bus 13.	Open or short in sub bus 13 main line or connector Open or short sub bus 13 branch line or connector Driving support ECU assembly Millimeter wave radar sensor assembly Lane departure warning camera*1 CAN No. 3 junction connector

*1: w/ Lane departure alert system

HINT:

The diagnosis procedure is for when DTC U1002 is output by the driving support ECU assembly (Techstream display: Pre-Collision 2).