B1CE313 - B1CE313 Right Outside Mirror Vertical Motor Driver Circuit Open Circuit

Detailed Technical Definition of B1CE313 Fault: Right Outer Mirror Up/Down Motor Drive Circuit Open

B1CE313 is a critical Diagnostic Trouble Code (DTC) recorded in the vehicle Body Domain Controller system, with its technical indication pointing to "Right Outer Mirror Up/Down Shifting Motor Drive Circuit Open". In terms of system architecture, this fault code indicates that the electrical communication link integrity between the Control Unit and the Actuator has been compromised. Specifically, "Drive Circuit Open" implies a high impedance or physical disconnection state along the power supply path from the controller output terminal to the vertical adjustment motor, preventing current from flowing normally through the closed loop to form effective work. This fault not only affects the mechanical position feedback of the rearview mirror but also directly interrupts the energy transmission required for the right outer mirror's up/down shifting motor, serving as a key metric monitored by the vehicle domain controller for drive system safety.

Common Fault Symptoms

When the vehicle control system determines that the B1CE313 fault condition is met, the driver may perceive the following specific abnormal phenomena during driving:

• Control Function Loss: The right outer mirror cannot execute up/down shifting adjustment actions; regardless of how the switch position changes, the mirror surface remains static.
• Operational Response Missing: When the driver attempts to adjust the viewing angle while the vehicle is started, there is no mechanical displacement feedback on the right outer mirror.
• System Status Locked: Some models may be accompanied by relevant area indicator lights lighting up on the instrument cluster warning system, indicating an abnormality in the rearview mirror drive subsystem.

Core Fault Cause Analysis

Based on the technical logic of this fault code, the root causes triggering B1CE313 can be divided into hardware or logical factors in the following three dimensions:

• Actuator Hardware Components: Physical damage occurs to internal coils, shifting valve cores, or Hall sensors within the right outer mirror vertical adjustment motor, causing the motor to lose responsiveness.
• Wiring and Connector Connections: Wiring harnesses connected to the rearview mirror exhibit open circuits, pin pull-outs, terminal oxidation/corrosion, or poor connector contact, resulting in an interruption of the signal transmission path.
• Controller Logic Operation Anomalies: Faults involving the right domain controller or logical errors when the general domain controller processes drive instructions occur, leading to an inability to output correct drive pulses or voltage control signals to the motor.

Technical Monitoring and Trigger Logic

To ensure accuracy in fault determination, the Control Unit continuously collects and processes the following key parameters in the background; B1CE313 is recorded only when all conditions are met simultaneously and exceed preset thresholds:

• Monitoring Target Object: The system primarily monitors drive current signals during the operation of the right outer mirror up/down shifting motor.
• Voltage Environment Constraints: The determination process must be effective within a high-level interval where the controller voltage is stable between $9V \sim 16V$ to prevent false alarms caused by low-voltage battery depletion.
• Fault Threshold Setting: The Control Unit continuously monitors drive current values; when a drive current of $0$ (i.e., no load current or short circuit protection state) is maintained for a continuous period of $3s$, an open circuit fault in the circuit is determined.
• Specific Operating Condition Requirements: The valid trigger condition for this fault determination is that the ignition switch is placed in the ON gear, and the right outer mirror up/down shifting motor has been instructed to activate operation. Only when the motor attempts to move but current cannot flow does the system recognize a drive circuit open circuit fault.