B1CE113 - B1CE113 Left Outside Mirror Folding Motor Driver Circuit Open Circuit

Detailed Fault Definition

In a vehicle electronic electrical architecture, fault code B1CE113 (Left Outer Rearview Mirror Folding Motor Drive Circuit Open Circuit) indicates the failure of the Left Domain Controller's continuity monitoring for specific actuator circuits. The control unit verifies loop integrity by collecting drive circuit current signals in real time. What is referred to as "Open Circuit" in this technical context does not mean physical breakage, but rather that the control unit detects that during command transmission, the drive circuit cannot maintain normal load current, showing an infinite or high impedance state, causing the system to judge it as an Open Circuit fault. This mechanism aims to protect the drive motor from short-circuit damage while ensuring users can clearly perceive the actual electrical state of the actuator. The generation of this fault code means that within the communication protocol between the vehicle central gateway and the Left Domain Controller, the closed-loop feedback logic regarding the rearview mirror folding function has been interrupted.

Common Fault Symptoms

When the system detects the above circuit abnormality, drivers can perceive the existence of this fault via the following methods:

• Total Function Loss: When operating the left outer rearview mirror folding switch or entering sleep automatic folding mode, the left outer rearview mirror glass will not perform any angle adjustment actions.
• Dashboard Feedback Abnormality: Under the condition that the vehicle is started and the ignition switch is in the ON position, the fault lamp or corresponding B1CE113 fault identifier will usually light up on the vehicle information display screen (MIB/I-DIS) of the dashboard.
• System Record Status: The vehicle's diagnostic interface will read historical data of this fault code, indicating that under specific electrical conditions, the drive current signal failed to pass preset threshold verification.

Core Fault Cause Analysis

From the perspective of electrical system engineering, potential factors causing B1CE113 faults are generally divided into the following three dimensions of logical possibilities:

• Hardware Component Abnormality (Actuator Level): Intercircuit short or open circuit inside the windings of the left outer rearview mirror folding adjustment motor, or poor brush contact on the motor, leads to inability to establish an effective electromagnetic field under power-on state, resulting in zero current collection value.
• Wiring and Connector Faults (Physical Connection Level): Harness connecting domain controller and mirror motor suffers mechanical damage, insulation layer damage leading to ground/power short circuit followed by protective open circuit, or poor contact/oxidation inside connector terminals leading to contact resistance too high until open circuit state.
• Controller Logic Operation Abnormality (Control Unit Level): Drive power module damaged inside left domain controller, unable to output effective drive voltage pulse; or current sampling circuit on controller side fails, erroneously misjudging normal low current state as open circuit signal, triggering protective recording.

Technical Monitoring and Trigger Logic

The judgment logic of this fault code is based on strict electrical parameter thresholds and operating conditions; the system performs dynamic monitoring only in specific states, with specific trigger logic as follows:

1. Drive Current Monitoring: Control unit collects output drive current in real time during left outer rearview mirror folding motor operation. When continuous collection time reaches $3s$ or more, if drive current is detected to be $0$ (or below preset minimum load threshold), system judges circuit exists open circuit risk.

2. System Supply Voltage Verification: Prerequisite condition for executing control logic is that power supply system is in normal energy state. Input voltage to controller monitored stable between $9V$~$16V$, excluding protective shutdown due to low battery or overvoltage.

3. Operation and Activation Conditions:

   • Start Switch Status: Vehicle ignition key or start button needs to be in ON position (Power-on mode).
   • Actuator Activation Signal: System must receive clear "Left Outer Rearview Mirror Folding Motor Working" instruction signal, meaning in active drive stage, not standby or sleep stage.

Only when above three dimensional conditions simultaneously met, and zero current signal continuously collected reaches set time threshold, B1CE113 fault code will be officially recorded and reported to vehicle diagnostic system.