B1E2D07 Cruise Switch Stuck Malfunction Technical Description

Definition of Fault Depth

This Diagnostic Trouble Code (DTC) B1E2D07 belongs to the vehicle cruise control system, mainly used to monitor the command status input by the driver via joystick or pedal to the control unit. In the system logic architecture, this fault indicates that the control unit detects an unintended persistent deviation between the actual input signal of the cruise switch and the expected operating state. This definition covers the underlying determination for consistency verification of physical mechanical position and electrical signal feedback; once the system judges it as a "stuck" state, it means the signal source failed to correctly respond to the polling request of the control unit or is stuck at a fixed level, resulting in "cruise switch function failure". This DTC aims to ensure the execution effectiveness of vehicle active safety strategies and prevent incorrect cruise commands from being executed erroneously.

Common Fault Symptoms

• Cruise Switch Function Failure: System cannot identify instructions for opening, closing, or speed setting.
• Dashboard Feedback Abnormality: Indicator lights related to cruise control may display as continuously on, flashing, or irregular jumping.
• State Switching Obstruction: After the operator presses or releases the button, the system fails to recognize state switching and continues to feedback signal unchanged.
• Function Persistent Interruption: Cruise control function suddenly interrupts during vehicle driving and cannot be restored through normal reset.

Core Fault Cause Analysis

Based on original data and technical logic, this fault may be caused by potential factors in the following three dimensions:

• Hardware Component Abnormality: Corresponding to "Cruise Switch Stuck" description, internal contact adhesion, mechanical structure obstruction or spring failure inside the physical actuator, causing inability to rebound or reset, resulting in fixed output signal level.
• Line/Connector Connection: Involving the transmission path of cruise switch signals, if lines have short circuit to power or ground, control unit will continuously receive error high or low level signals, simulating "stuck" fault phenomenon.
• Controller Logic Operation: The controller responsible for processing cruise signals may due to internal data processing errors, fail to correctly parse switch state change pulses, thereby judging input end abnormality and triggering B1E2D07.

Technical Monitoring and Trigger Logic

System determines generation of this DTC via the following logic flow:

• Monitoring Target: Control unit captures cruise switch input signal level and status jump frequency in real time to ensure operation instructions can be accurately captured and converted into executable control strategies.
• Working Condition Setting: Fault occurs only when vehicle power supply is activated, specific trigger condition is "Ignition Switch in ON position", at which point entire vehicle electronic architecture enters working state and bus communication is normal.
• Judgment Logic: When driver executes "Cruise Switch Operation" action, control unit expects to detect clear signal state switching (e.g., from OFF to ON or vice versa). If system continuously monitors input signal no expected jump or always maintains single level, meeting "Cruise Switch Stuck Fault" setting condition, then records DTC B1E2D07.