B1CE119 - B1CE119 Left Outside Mirror Folding Motor Driver Overload

Fault Detailed Definition

The fault code B1CE119 is defined as "Left exterior mirror folding motor drive overload fault". In the vehicle electronic architecture, this code identifies abnormal monitoring results of the load current by the Domain Control Unit (DCU). When the system controls the left exterior mirror folding adjustment motor to perform mechanical actions, the control unit collects current data in the drive circuit in real time. If the current load of the motor exceeds preset safety thresholds and persists for a specific duration, it indicates an overloaded state of the motor. This definition covers multidimensional possibilities ranging from surges in mechanical resistance to misjudgment of electrical signals, aiming to ensure that the motor does not burn out or sustain structural damage due to excessive electromagnetic torque.

Common Fault Symptoms

Based on the trigger logic and mechanical principles of fault code B1CE119, this fault typically manifests as perceivable phenomena in driving experience:

• The left exterior mirror cannot execute remote folding commands, or the motor stops working when attempting to fold.
• During side mirror adjustment operation, the multifunction information display may pop up a prompt or store relevant diagnostic logs.
• Relevant system indicator lights on the instrument panel (such as vehicle stability system or door/mirror status lights) may appear abnormally illuminated.
• The overall driving of the vehicle is not affected, but the motor has no response or makes abnormal noise under specific conditions (such as when parking and unfolding the mirror).

Core Fault Cause Analysis

According to fault definition and electrical characteristics, causes leading to this fault can be summarized into the following three dimensions:

1. Hardware Components: The folding adjustment motor itself for the left exterior mirror experiences mechanical jamming internally, or foreign objects enter the guide rail or gear structure, causing a drastic increase in rotational resistance. At this time, to overcome resistance, the motor causes abnormally increased drive current.
2. Wiring/Harness/Connectors: The wiring harness connecting the left exterior mirror motor has physical faults such as short circuits, open circuits, or excessive contact resistance. Additionally, corrosion or loosening of connector pins may cause excessive voltage drop or unstable signal transmission, distorting the current data collected by the controller.
3. Controller: Abnormalities occur in the internal logical operation module of the left domain controller, unable to correctly parse the motor current feedback signal. Under specific parameters, the controller may erroneously determine a normal current fluctuation as an overload state, thus triggering protective fault recording.

Technical Monitoring and Trigger Logic

The core of system fault determination lies in dynamic monitoring of multi-condition parameters, with specific technical logic as follows:

• Monitoring Targets: Real-time monitoring of the working current value of the left exterior mirror folding motor and system power supply voltage stability.
• Numerical Range Determination: The necessary electrical environment for triggering a fault is controller voltage stable between $9V$~$16V$. At the same time, the start switch must be in the ON position, ensuring the vehicle is powered on, and the left exterior mirror folding motor is during a drive task. Under this condition, the continuously collected drive current values must meet $\ge 0.5A$.
• Trigger Logic: The system sets a time threshold to exclude instantaneous interference. Only when the above high current state (i.e., current value greater than or equal to $0.5A$) persists for more than $3s$ (3 seconds), the control unit will finally determine the fault exists and store fault code B1CE119.