B2CEE00 - B2CEE00 Time Synchronization Failed Between Slave Radar And Master Radar

Depth Definition of the Fault

B2CEE00 is a specific diagnostic trouble code (DTC) for the vehicle cooperative perception system, its core defines "failure of time synchronization between the corner radar and the main radar" as a system-level anomaly. In modern intelligent and assisted driving architectures, blind spot monitoring functions rely on multi-sensor fusion technology; the left rear corner radar (Corner Radar), as a distributed sensing node, must maintain high-precision time basis alignment with the vehicle's central main radar (Main Radar). This fault code means the two key sensing units cannot complete the timing handshake protocol, causing misalignment of data streams on the time axis, thereby destroying the physical position feedback mechanism of the sensor fusion loop. This type of fault directly affects the real-time data processing capability of the control unit, belonging to a deep technical definition at the level of system network communication and hardware timing logic.

Common Fault Symptoms

When DTC B2CEE00 is confirmed to be triggered, the vehicle's electronic electrical system will switch the perception module to fail-safe mode, and users may observe the following perceptible phenomena during driving:

• The blind spot monitoring function indicator light on the instrument panel goes out or displays an unavailable status;
• The vehicle automatically blocks side and rear obstacle warning and prompt functions;
• Related assisted driving functions are forcibly downgraded or temporarily disabled;
• The dashboard failure light (Service/Warning Light) may illuminate along with it, indicating a system communication anomaly.

Core Fault Cause Analysis

Regarding the failure of time synchronization between the left rear corner radar and the main radar, technical principles need to be analyzed from the following three dimensions:

1. Hardware Components: Involves the stability of the internal clock crystal oscillator of the left rear corner radar sensor, the real-time processing capability of the main radar processor, and whether the RF front-end module responsible for timing reference synchronization has drifted or aged.
2. Cables and Connectors: Communication lines between the corner radar and main radar (such as CAN Bus) have physical open circuits, short circuits or signal impedance mismatches, causing interruption of synchronization instruction transmission; simultaneously, poor contact of power connector plugs may also affect hardware power supply stability.
3. Controller Logic Operation: The control unit (ECU) responsible for managing time synchronization encounters logic judgment errors when parsing synchronization handshake packets, unable to correctly identify timestamp data packets from corner radar, or fails to execute preset timing verification algorithms.

Technical Monitoring and Trigger Logic

The setting and triggering of this fault code follow strict electronic control unit monitoring algorithms, specific monitoring targets and logic conditions are as follows:

• Monitoring Target: The system continuously monitors controller power supply voltage stability and private CAN bus communication status, focusing on verifying the integrity of time synchronization handshake signals and timing response.
• Numerical Range Constraint: The controller voltage range for fault determination is strictly limited to the interval of $9V \sim 16V$. Exceeding this range will trigger power-related protection rather than this specific DTC.
• Specific Operating Conditions and Delay Logic:
  • Delay time after bus initialization completion is $3s$;
  • The monitoring window after vehicle power-on is $3s$;
  • The service mode detects fault codes (DTC) and after $3s$, the system confirms the fault persists;
  • Precondition Constraint: The private CAN bus must be in normal communication status (not entering bus-off state), and the vehicle must be in non-factory mode.

Only when all above diagnostic start conditions are met, and time synchronization failure is observed within the allowed voltage range, B2CEE00 fault code will be formally written into the storage unit.