DTC U1002: Lost Communication with Gateway Module (MS Bus); DTC U1114: Lost Communication with Main Switch Module [08/2015 - 08/2019]: Description

• The main body ECU (multiplex network body ECU) stores this DTC when no signals can be received from the ECUs that are memorized as those connected to the CAN MS bus.
• When the main body ECU (multiplex network body ECU) receives a response signal from the ECUs connected to the CAN MS bus, the main body ECU (multiplex network body ECU) recognizes and memorizes that the ECU is connected to the CAN MS bus. Based on this memorized data, the main body ECU (multiplex network body ECU) monitors for malfunctions in the ECUs connected to the CAN MS bus when communicating with those ECUs. If the main body ECU (multiplex network body ECU) cannot receive response signals from the ECUs that are memorized as those connected to the CAN MS bus, the main body ECU (multiplex network body ECU) 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 [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).

DTC Code	DTC Detection Condition	Trouble Area
U1002	Lost communication with the gateway module (MS bus).	Power source or inside main body ECU (multiplex network body ECU) Power source or inside drive monitor switch CAN MS bus circuit Main body ECU (multiplex network body ECU) main wire or connector Drive monitor switch main wire or connector Main body ECU (multiplex network body ECU) Drive monitor switch
U1114	Lost communication with the main switch module.	Power source or inside main body ECU (multiplex network body ECU) Power source or inside drive monitor switch CAN MS bus circuit Main body ECU (multiplex network body ECU) main wire or connector Drive monitor switch main wire or connector Main body ECU (multiplex network body ECU) Drive monitor switch

HINT: 

For vehicles with CRAWL control only.