B1103 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1103 – Communication Voltage Too Low
B1103 Possible Symptoms
Air Bag Warning Light ON
B1103 Possible Causes
Faulty Sensing and Diagnostic Module (SDM),Sensing and Diagnostic Module (SDM) harness is open or shorted,Sensing and Diagnostic Module (SDM) circuit poor electrical connection
When the ignition switch is turned to ON, the Sensing and Diagnostic Module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself. Upon passing these test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops. The SDM checks the wiring connection to each inflator by letting the infinitesimal current flow through the internal circuit and verify the resistance. But if the voltage is out of range, SDM is unable to check the airbag system properly.