BYD ATTO 3 (e-Platform 3.0) B169416 SRS ECU Fault

B169416 indicates a fault detected by the supplemental restraint system (SRS) electronic control unit (ECU). The fault affects the SRS control system responsible for monitoring restraint circuits, processing crash-sensor information, and managing airbag and seat-belt pretensioner functions. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.

Symptoms

• SRS or airbag warning light illuminated
• Airbag system warning message displayed
• B169416 stored in the SRS control system
• Airbag or pretensioner functions may be restricted
• Multiple SRS-related fault codes may be stored
• SRS warning may remain after vehicle restart
• Fault may occur intermittently
• Vehicle may report a restraint-system malfunction

Possible Causes

• Internal SRS ECU fault
• SRS ECU power supply or ground fault
• Low or unstable 12V system voltage
• CAN communication fault
• Damaged SRS ECU connector
• Loose, damaged, or corroded terminals
• Wiring fault affecting the SRS ECU
• Incorrect ECU configuration or programming
• Previous collision or SRS repair
• Fault in another restraint-system component causing an associated ECU fault

Diagnosis

Diagnosis should begin by confirming B169416 and performing a complete SRS scan to identify associated airbag, pretensioner, impact-sensor, voltage, and communication faults. SRS ECU power and ground supplies, network communication, connector condition, stored diagnostic data, and system status should then be assessed against manufacturer specifications.

Because the SRS ECU controls safety-critical restraint functions, manufacturer procedures should be followed when determining whether the fault originates within the ECU or from an external circuit. For New Zealand owners, confirming the underlying SRS fault before replacing the control unit 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.