B1CE319 - B1CE319 Right Outside Mirror Vertical Motor Driver Overload

B1CE319 Right Side Outside Rearview Mirror Up/Down Gear Change Motor Drive Overload Fault

Fault Definition

This fault code (DTC) is identified as B1CE319, specifically defined as "Right side outside rearview mirror up/down gear change motor drive overload". In automotive electronic architecture, this code reflects the vehicle electrical control system's real-time monitoring judgment of the right outer rearview mirror actuator load state. So-called "drive overload" refers to the motor current peak or duration detected by the control unit exceeding the preset safety threshold within the system's specific working interval. This fault signal primarily indicates abnormal mechanical resistance increase in the right outer rearview mirror folding adjustment system, or physical obstruction within the motor, causing drive current to exceed the allowable matching range of $0.5A$. This diagnostic logic is executed by the Left Domain Controller, reflecting the central management strategy of domain controllers for body peripheral execution in the current vehicle architecture. This fault belongs to an abnormal feedback loop between the electrical system and mechanical actuator, directly affecting the reliability and safety of the rearview mirror electric adjustment function.

Common Fault Symptoms

Based on current overload monitoring data, this fault typically manifests as the following phenomena in owner driving experience and instrument state:

• Rearview Mirror Electric Adjustment Failure: Right side outer rearview mirror cannot respond to folding or unfolding commands in the "up/down" direction; buttons show no response or the actuator is completely locked.
• Dashboard Fault Indicator Light Illumination: Vehicle electronic systems may trigger DTC storage and display corresponding function restriction warning prompts on the onboard information screen or instrument panel.
• Abnormal Mechanical Sound: If the motor is only stalled rather than burnt, abnormal friction sound or "click" noise from current overload protection may be heard at the rearview mirror base when attempting to drive it.
• Operation Feedback Delay: Under certain conditions, the motor may attempt to rotate and stop quickly, leading drivers to perceive significant lag in control commands.

Core Fault Cause Analysis

Regarding the generation mechanism of this fault code, technical categorization of root causes from system architecture and hardware physical layers is as follows:

• Hardware Component Abnormality (Motor Unit): Internal components of the right outer rearview mirror folding adjustment motor may experience coil short circuit, Hall sensor signal anomaly, or rotor mechanical jam. When foreign objects inside the motor obstruct rotation, load resistance increases sharply, causing drive current to spike instantaneously to overload levels.
• Wiring and Connector Faults: The harness connecting the right outer rearview mirror motor may have localized damage, excessive contact resistance, or oxidized loose connector terminals. Such physical connection issues lead to uneven signal transmission, causing the controller to misjudge current readings or actual load increases.
• Controller Logic Computation Error: Performance degradation of drive circuits or power management modules within the Left Domain Controller may occur, preventing it from closing drive commands at the correct current threshold, thereby determining an overload state.

Technical Monitoring and Trigger Logic

The determination of this fault code is based on strict time window matching and numerical range conditions; specific monitoring logic is as follows:

• Monitored Target Parameters: The system primarily collects working current and power supply voltage signals for the right outer rearview mirror folding adjustment motor.
• Numerical Threshold Setting:
  • Drive Current Threshold: Overload determination process initiates upon continuous detection of $V_{current} \ge 0.5A$, ensuring response only to matching currents exceeding safe load levels.
  • Controller Voltage Range: Monitoring logic is active only when system supply voltage is within the standard working interval of $9V$~$16V$, excluding sensor error interference caused by low voltage.
• Trigger Operating Conditions:
  • Switch Status: The start switch must be in the ON gear to ensure the entire vehicle electronic system is activated.
  • Action Execution: The right outer rearview mirror folding motor must be in active working mode, i.e., when the driver issues adjustment commands or the system enters a self-check cycle.
• Time Window Logic: Fault confirmation is not triggered by single sampling but requires the controller to maintain a "≥ $0.5A$ current value" state duration for 3s during continuous data collection. Only after overload state is stably maintained beyond this time threshold will the control unit officially light up the fault code and record logs.