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

The driving support ECU assembly stores this DTC when no signals can be received from the ECUs that have been memorized as those connected to the sensor bus.
When the driving support ECU assembly receives a response signal from the ECUs connected to the sensor bus, the driving support ECU assembly recognizes and memorizes that the ECU is connected to the sensor bus. Based on this memorized data, the driving support ECU assembly monitors for malfunctions in the ECUs connected to the sensor bus 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 the sensor bus, the driving support ECU assembly determines that a malfunction exists.
If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [CAN branch wire]/CANL [CAN branch wire] of the ECU and/or sensor is open).

DTC Code	DTC Detection Condition	Trouble Area
U1002	Lost communication with the gateway module (sensor bus).	Sensor bus circuit Millimeter wave radar sensor assembly CAN main wire or connector Driving support ECU assembly CAN main wire or connector Driver monitor ECU assembly CAN branch wire or connector1 Lane recognition camera sensor assembly CAN branch wire or connector2 Millimeter wave radar sensor assembly Driving support ECU assembly Driver monitor ECU assembly1 Lane recognition camera sensor assembly2 No. 3 junction connector