B1E3107 - B1E3107 Set Switch Stuck Fault

Detailed Fault Definition

DTC B1E3107 represents "Setting Switch Stuck Fault". This code is defined as an abnormal locked state of specific configuration input signals within the vehicle electronic control architecture. In this system, the "Setting Switch" typically refers to physical buttons or knob components used to adjust body functions, light modes, or interior settings. When the system detects that the control unit receives a signal that cannot undergo expected level transitions or logic flips in response to the operator's actions, it is judged as a "Stuck Fault". This fault indicates that persistent state retention exists at the actuator end regarding physical position feedback or digital input signals, failing to reflect real dynamic changes, thereby triggering protective freeze logic for this input channel.

Common Fault Symptoms

After DTC B1E3107 activates, owners may observe the following system behavior anomalies during driving:

• Missing Operational Response: The function of the setting switch completely fails; no substantive feedback is generated by the vehicle control system when pressing or rotating the switch.
• State Locking Phenomenon: The system incorrectly records the current last state; for example, a button might be mistakenly believed to be in a fixed "ON" or "OFF" position and cannot switch modes.
• Instrument Indication Anomaly: Some models may display a fault indicator light for this specific subsystem on the related control unit's self-check screen or instrument cluster.
• Function Logic Conflict: Subsequent actions depending on the switch controlled (such as light delays, seat adjustment) may appear uncontrollable or interrupted.

Core Fault Cause Analysis

For the judgment of B1E3107 "Setting Switch Stuck", the root causes can be summarized into hardware and signal anomalies in the following three dimensions:

• Hardware Component Failure: The mechanical transmission mechanism inside the setting switch gets stuck, or internal microswitch contacts stick together due to carbon buildup or oxidation, preventing physical actions from changing the electrical signal on/off state.
• Wiring/Connector Issues: The harness connecting the switch to the control unit may have a ground short or power supply short, causing the control unit to misjudge constant input voltage, thereby triggering "Stuck" logic; alternatively, loose plug terminals or poor contact introducing abnormal impedance.
• Controller Logic Operation Deviation: Under extreme operating conditions, occasional interference may occur in the sampling circuit or digital filtering algorithm inside the control unit, incorrectly judging normal transient signals as a continuous locked state (probability is low but needs to be included in technical troubleshooting scope).

Technical Monitoring and Trigger Logic

The setting of this fault code follows strict dynamic signal monitoring logic. Specific trigger mechanisms are as follows:

• Monitoring Target: The system monitors the output signal level of the setting switch and its change rate in real-time. The focus is on detecting whether the signal state changes according to expectations during user operation (i.e., from $Low$ level to $High$ level or vice versa).
• Trigger Conditions: A specific combination of conditions must be met to record the fault code, specifically: Ignition Switch set to ON position (vehicle enters power ready state) AND Setting Switch is being operated.
• Judgment Logic: Within the time window satisfying the above conditions, if the control unit detects that the signal state at the input end has not undergone any expected change, or the signal voltage is locked at a specific value (such as continuous high or low level) and cannot respond to physical rotation/pressing, the system immediately records "Setting Switch Stuck Fault".