B1D03 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1D03 – Right High Beam Circuit Short
B1D03 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B1D03 Possible Causes
Faulty Right High Beam Bulb,Right High Beam Bulb harness is open or shorted,Right High Beam Bulb circuit poor electrical connection,Faulty Steering Column Control Module (SCCM)
The Steering Column Control Module (SCCM) monitors input from the multifunction and headlamp switches. When the headlamp switch is in the HEADLAMPS ON position and the multifunction switch is placed in the HIGH BEAM position, the SCCM sends a message to the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN), indicating a high beam request. The BCM then provides voltage to the high beams. The BCM provides an overload protection of the high beam output circuits. When an excessive current draw is detected, the BCM disables the affected high beam circuit driver. The Instrument Panel Cluster (IPC) also receives a message over the HS-CAN to illuminate the high beam indicator when a request for the high beams is received. This Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground or open from the RH high beam output circuit.