BYD ATTO 3 (e-Platform 3.0) B227E13 Rear Interior Detection Antenna Open Circuit

B227E13 indicates an open circuit has been detected in the rear interior detection antenna circuit. The fault affects the smart key and keyless entry system, where interior antennas detect the presence and location of an authorised key within the cabin for key recognition and access-control functions. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.

Symptoms

• Smart key may not be detected correctly in the rear cabin
• Vehicle may display a smart key detection warning
• Keyless entry or starting functions may operate intermittently
• Vehicle may fail to recognise the key in certain cabin positions
• Passive access functions may be inconsistent
• B227E13 stored in the keyless entry control system
• Other smart key antenna faults may be present
• Fault may occur intermittently

Possible Causes

• Open circuit in the rear interior detection antenna wiring
• Faulty rear interior detection antenna
• Loose or disconnected antenna connector
• Damaged connector terminals
• Corrosion or poor electrical contact
• Damaged wiring within the rear cabin
• Incorrectly installed or damaged antenna
• Low or unstable 12V system voltage
• Keyless entry control-module fault
• Communication fault affecting antenna operation

Diagnosis

Diagnosis should begin by confirming B227E13 and checking whether the smart key is detected correctly at other interior locations. The rear interior antenna circuit, connector condition, wiring continuity, antenna status, power supply, and relevant control-module communication should then be evaluated against manufacturer specifications.

Comparing the affected antenna with other interior detection antennas can help determine whether the fault is isolated to the antenna assembly or its wiring. For New Zealand owners, confirming the antenna circuit before replacing keyless entry components can help avoid unnecessary repair costs.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, connector pinouts, specifications, and system calibration information. Access to the factory service manual significantly reduces diagnostic time and helps prevent unnecessary parts replacement.

Applicable Years

2022, 2023, 2024, 2025, 2026, onwards

To order the correct OEM Service and Repair Manual for your BYD ATTO 3, submit your request using the form below and our team will provide the ordering details.