DTC U1002: Lost Communication with Gateway Module (Sensor Bus); DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor [08/2015 - ]: Description

The driving support ECU assembly will store this DTC when no signals can be received from the ECUs that have been memorized as those 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
U0235	No communication from the millimeter wave radar sensor assembly continues.	Open or short in sub bus 13 main line or connector Millimeter wave radar sensor assembly Power source circuit of millimeter wave radar sensor assembly Millimeter wave radar sensor assembly ground circuit
U1002	The driving support ECU assembly cannot receive signals from all ECUs that have been memorized as those connected to the sensor bus 13.	Open or short in sub bus 13 main line or connector Driving support ECU assembly Power source circuit of driving support ECU assembly Driving support ECU assembly ground circuit Millimeter wave radar sensor assembly Power source circuit of millimeter wave radar sensor assembly Millimeter wave radar sensor assembly ground circuit

HINT:

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