DTC U1103: Lost Communication with Stop and Start Control Module [09/2014 - 10/2015]: Description

The certification ECU (smart key 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 2.
When the certification ECU (smart key ECU assembly) receives a response signal from the ECUs connected to sub bus 15, the certification ECU (smart key ECU assembly) recognizes and memorizes that the ECU is connected to sub bus 15. Based on this memorized data, the certification ECU (smart key ECU assembly) monitors for malfunctions in the ECUs connected to sub bus 15 when communicating with those ECUs. If the certification ECU (smart key ECU assembly) cannot receive response signals from the ECUs that have been memorized as those connected to sub bus 15, the certification ECU (smart key ECU assembly) determines that a malfunction exists.

DTC Code	DTC Detection Condition	Trouble Area
U1103	Certification ECU (smart key ECU assembly) cannot receive signals from all ECUs that have been memorized as those connected to sub bus 15.	Open or short in sub bus 15 main line or connector Certification ECU (smart key ECU assembly) ECM Open or short in No. 8 junction connector