AU
B1610-00

DTC B1610-00 indicates the SRS (Supplemental Restraint System) ECU detected abnormal resistance in the front passenger-side frontal airbag ignition circuit, specifically 0 Ω (short circuit) or infinite resistance (open circuit) — Atto 3

Safety System

DTC B1610-00 indicates the SRS (Supplemental Restraint System) ECU detected abnormal resistance in the front passenger-side frontal airbag ignition circuit, specifically 0 Ω (short circuit) or infinite resistance (open circuit).

In the BYD fault definition system, this code means "front passenger frontal airbag disconnected," indicating a loss of circuit integrity between the SRS ECU and the front passenger airbag module.

This hard fault triggers the system fail-safe mode: the SRS ECU disables all airbag deployment (including the driver-side, side, and curtain airbags) and continuously illuminates the instrument cluster airbag warning lamp.

Because this fault involves the occupant passive safety system, it carries the highest priority.

The airbag system returns to normal standby status only after fault repair.

3
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Loose front passenger airbag connector, backed-out terminals, or corrosion: The yellow connector behind the airbag module or on the right side of the dashboard is not fully locked, or oxidized terminals cause excessive contact resistance or an open circuit.
  • 2Clock spring (spiral cable) internal damage: An open or short circuit in the spiral ribbon cable beneath the steering wheel interrupts the front passenger airbag circuit signal (some models share or link this detection with the front passenger airbag circuit).
  • 3Water ingress into the SRS ECU connector or damaged terminals: The ECU mounts beneath the center console. After driving through water, connector G10/M40 terminals corrode or back out, preventing airbag resistance detection.
  • 4Airbag module squib fault: Internal igniter short circuit (resistance 0Ω) or open circuit (resistance ∞). Common causes include impact damage, moisture ingress, or airbag aging.
  • 5Dashboard wiring harness wear: Air conditioning duct or metal bracket rubs through the airbag wiring harness insulation, causing a short to ground or an open circuit.
What To Do
  • 1
    Use the BYD VDS or Launch X431 diagnostic tool to read the fault code, confirm B1610-00 is a current fault (Current DTC), and record the ambient temperature and vehicle status from the freeze frame data.
  • 2
    Perform the safe power-down procedure: Turn off the ignition, disconnect the negative battery terminal, and wait at least 90 seconds to fully discharge the SRS capacitor and prevent accidental airbag deployment.
  • 3
    Visually inspect the front passenger airbag connector (yellow, usually located behind the glove box or on the back of the airbag). Confirm the locking tab is fully engaged. Check for backed-out pins or green corrosion.
  • 4
    Disconnect the SRS ECU connectors (G10 and M40). Use a multimeter to measure the resistance between the corresponding terminals of the front passenger airbag circuit. The normal value is 2.0±0.3Ω. A reading of 0Ω indicates a short circuit; an infinite reading indicates an open circuit.
  • 5
    If resistance is abnormal, disconnect the airbag connector and directly measure the airbag unit resistance (normal is approximately 2.0Ω). If normal, check harness continuity section by section, focusing on clock spring (spiral cable) continuity.
  • 6
    Connect a 2.7Ω dedicated simulation resistor into the circuit in place of the airbag. If the fault code changes to a stored fault, the airbag unit is faulty. If the fault remains current, inspect the wiring harness and ECU.
  • 7
    Repair or replace the faulty component (airbag, clock spring, wiring harness, or ECU). Reconnect all connectors and verify the yellow connector locks fully into place.
  • 8
    Connect the battery, turn the ignition switch to the ON position, use the diagnostic tool to clear the fault codes and perform the 'SRS system self-diagnosis', and verify there are no current fault codes.
  • 9
    Perform system verification: Lightly tap the area near the SRS ECU and turn the steering wheel. Verify the fault light turns off and remains off to confirm good contact.
Real-World Cases
BYD DTC AI AnalysisFrom Chinese market (translated)

Loose connection at the BYD S6 front passenger airbag connector caused B1610-00

✓
The airbag warning light on a 2014 BYD S2/S6 stayed on constantly. A diagnostic scan showed active DTC B1610-00: “Front passenger frontal airbag resistance zero”. Following the workshop manual, the technician disconnected SRS ECU connector G10 and measured the resistance across the passenger airbag circuit pins — infinite (open circuit). Further inspection found the yellow airbag connector behind the glovebox: it looked plugged in, but the locking tab wasn’t fully seated, causing an intermittent connection from vehicle vibration. The technician unplugged and reconnected the connector, making sure to hear the “click” of the lock engaging. After that, the resistance measured a normal 2.1Ω. Clearing the DTC resolved the fault.
Original source ↗
BYD DTC AI AnalysisFrom Chinese market (translated)

Internal open circuit in BYD Qin EV clock spring triggers airbag circuit fault

✓
2018 BYD Qin EV450. The airbag warning lamp illuminated intermittently when turning the steering wheel while driving, eventually staying on constantly. Fault code B1610-00 stored. Initial inspection showed the passenger airbag connector was normal; measured airbag resistance was 2.5 Ω, normal. During inspection, when turning the steering wheel, the airbag circuit resistance would momentarily go infinite. Removed the clock spring (spiral cable) beneath the combination switch and found the internal flexible ribbon cable partially fractured from long-term rotational wear. Replaced the clock spring assembly (part number: HK-347890). After multiple steering wheel rotations, resistance remained stable. Cleared the fault code; it did not return.
BYD DTC AI AnalysisFrom Chinese market (translated)

BYD E1 SRS ECU connector corrosion case after wading

✓
2019 BYD E1. The airbag warning light illuminated after driving through flood water during heavy rain. Retrieved DTC B1610-00. Inspection found water ingress traces on the carpet. The SRS ECU is mounted low under the centre console; its connector G10 showed obvious water staining and green oxidation inside. Cleaned the ECU and harness terminals using electronic cleaner, applied specialised conductive protectant (not grease), and dried thoroughly with compressed air. Also checked the passenger airbag harness insulation and found no damage. Reconnected and waterproofed the connector, cleared the fault codes, and resolved the fault. Also recommend checking the AC drain holes for blockages.
Original source ↗
Other Atto 3 Fault Codes
P0A0DBattery Energy Control Module Requested MIL IlluminationP0AA6Hybrid Battery Voltage System Isolation FaultP1A00Drive Motor "A" Performance — BYD proprietaryB1108For the BYD Song MAX (2017–2019), DTC B1108 indicates a short circuit in the PM2.5 air quality detection module (dust sensor) or its wiring harness. The sensor uses laser scattering to detect in-cabin and outside PM2.5 concentrations and transmits data to the HVAC ECU via the LIN bus or an analog signal. Short circuit conditions include: 1) Sensor power supply wire (+5V/+12V) shorted to ground 2) Signal wire shorted to power or ground 3) Short circuit in the sensor's internal photoelectric detection circuit This fault prevents the automatic climate control from switching between fresh air and recirculation based on air quality. The system enters fail-safe mode (typically forced recirculation). Severe short-circuit current can destroy the HVAC ECU sampling circuit. The system classifies this as a Level 3 severe fault and restricts vehicle operation to prevent electrical fires or controller damage. For other BYD models (such as the Qin EV, E5, and Song DM), B1108 indicates a driver-side sunload sensor fault, reflecting differences in DTC definitions across models.B110811This DTC indicates a short circuit in the air conditioning system PM2.5 air quality sensor (rapid detector). Specifically, abnormal continuity exists between the sensor power supply circuit or signal output circuit and body ground or battery positive. This causes the control module (ACU/air conditioning controller) to detect abnormal current or a voltage signal outside the valid range (typically 0V or supply voltage). The PM2.5 sensor monitors internal and external particulate concentrations, providing the data the automatic air conditioning system uses to switch between fresh air and recirculation modes. A short circuit disables the air quality monitoring function. This fault may force the air conditioning system into recirculation protection mode and trigger related thermal management system faults, as the air conditioning system acts as a key actuator in vehicle thermal management. In severe cases, the short circuit current can damage the internal sampling circuit of the air conditioning controller or overheat the wiring harness.
Data confidence: Official This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself. Sources: [1]