B2CED00 - B2CED00 Antenna Pattern Invalid or Version Mismatch Fault

B2CED00 Fault Definition

B2CED00 fault code specifically identifies invalid Antenna Map or version mismatch, this code belongs to the Adaptive Cruise Control (ACC) system diagnostic scope in vehicle electronic architecture. From a technical principle perspective, ACC system function failure is directly associated with the integrity and accuracy of forward sensor data. When the system detects anomalies related to Antenna Map regarding real-time radar target management data (RTMD), it determines as version or data status mismatch. The core fault lies in the control unit comparing calibration files stored in vehicle control software with the physical installed antenna location map (Antenna Map) at the hardware end, finding inconsistency, causing sensor coordinate mapping to fail logical verification.

Common Fault Symptoms

When B2CED00 code is recorded, drivers can perceive the following phenomena via onboard interaction interface or instrument cluster feedback:

• ACC System Function Failure: ACC control unit actively disables longitudinal distance keeping function due to data validation failure, unable to maintain preset vehicle speed and distance.
• Instrument Warning Light: ACC related warning light may turn on on vehicle dashboard, indicating sensor calibration abnormality or communication status mismatch.
• Driving Mode Limited: Under conditions requiring auto-following, system prompts to check antenna map or radar version, prohibiting entry into cruise mode.
• Onboard Information Prompt: Central screen may pop up fault prompt information about invalid antenna data, informing users that current driving assistance functions are unavailable.

Core Fault Cause Analysis

For B2CED00 diagnosis logic, fault sources can be classified into following three dimensions for analysis:

1. Hardware Components (Hardware Modules) Root cause lies in Forward Millimeter-wave Radar Failure. If radar module's own receiving antenna or transmitting chip works abnormally, it will lead to inability to generate standard-compliant RTMD data, causing Antenna Map status determination as invalid. This belongs to physical level sensing hardware failure, directly leading to data collection source interruption.

2. Wiring/Connectors (Physical Connections) Although fault code points mainly to radar module, signal transmission link status directly affects Antenna Map data integrity. If wiring connecting radar and control unit has open circuit, short circuit or impedance mismatch, or connector oxidation poor contact, it may cause RTMD results lost or damaged during transmission, then system determines as invalid.

3. Controller (Logic Operations) Fault determination involves version mismatch logic operation problem. Control unit internal software version or calibration database may not match radar end hardware firmware version. When system finds Antenna Map RTMD result check invalid after successful function operation during startup self-check, indicates controller data validation algorithm failed current version logic verification.

Technical Monitoring and Trigger Logic

Generation of this fault code depends on specific system initialization sequence and data comparison algorithms, specific monitoring and trigger logic as follows:

• Monitoring Targets:

  • RTMD Results: Focus monitoring real-time validity of radar target management data.
  • Antenna Map Status: Monitoring integrity of antenna location map data stored inside vehicle system.
  • Function Operation Status: After attempting to execute ACC function operation, monitor if system identifies valid RTMD results.

• Value Range and Logic Judgment:

  • When checking Antenna Map RTMD Results, system requires function operation success check result must be valid (Valid = $True$).
  • If monitoring result is invalid (Invalid = $False$), and duration satisfies threshold, record fault.

• Specific Trigger Conditions:

  • Ignition Switch in ON Position: Fault triggers only when vehicle power on and entering system self-check process. At moment IGN switch opens, system reads Antenna Map and compares version, once mismatch or function operation result invalid immediately store B2CED00.

• Fault Set Conditions: System checks upon performing function operation and confirming success, if at this time check result invalid, satisfies Set Fault Condition, triggers B2CED00 fault code generation.