NO
AU
B1764

DTC B1764 indicates the Right Front Side Curtain Airbag igniter circuit resistance falls below the SRS control unit (ACU) threshold (typically <1 — Atto 3

Safety System

DTC B1764 indicates the Right Front Side Curtain Airbag igniter circuit resistance falls below the SRS control unit (ACU) threshold (typically <1.0Ω or below 70% of the nominal 2.0Ω).

This fault suggests an internal inter-turn short circuit in the airbag squib, or a short to ground or power in the wiring harness or connector, causing an abnormal drop in total circuit resistance.

This critical safety fault causes the SRS system to detect a short-circuit risk in the airbag circuit, potentially triggering unintended deployment or failure during a collision.

Consequently, the system illuminates the airbag warning light and disables the airbag's deployment function, severely compromising side-impact protection.

4
Cases Logged
Real-World Cases
BYD DTC AI Analysis

Song MAX A-pillar wiring harness chafing caused airbag circuit short

✓
After accident repairs, a 2019 Song MAX had the SRS warning light on constantly. VDS read current DTC B1764. Removing the right front A-pillar trim revealed the airbag wiring harness retaining clip missing from the crash repair. The harness had rubbed against the door hinge during door operation, wearing through the insulation and shorting the copper core to ground. Repaired the harness, secured it properly, and wrapped it in abrasion-resistant sleeving. Resistance measurements returned to normal; cleared the DTC and resolved the issue.
BYD DTC AI Analysis

Qin Pro sunroof leak caused airbag connector corrosion and short circuit

✓
A 2020 Qin Pro owner reported the airbag warning light came on after a car wash. The diagnostic tool showed active fault code B1764. Inspection of the right front side curtain airbag connector (located below the A-pillar) found water inside with oxidized, blackened pins. Resistance measured only 0.6Ω. Traced to a detached right front sunroof drain hose connector, allowing water to run down the A-pillar. Cleaned the connector oxides, blew it dry, applied conductive protective agent, and repaired the drain hose. Fault cleared.
BYD DTC AI Analysis

Song MAX aftermarket dash cam installation triggered airbag fault

✓
While self-installing a dashcam, the owner forced the power cable behind the right-front A-pillar trim, crushing and piercing the factory SRS harness insulation. This shorted the right-front side curtain airbag circuit to ground, measuring 0.8Ω resistance and setting DTC B1764. Removing the A-pillar trim revealed a flattened harness with cut marks. Repaired the damaged section, restored the original harness routing, and properly secured the aftermarket cable to return the system to normal.
BYD DTC AI Analysis

Qin Fuel SRS control unit false positive B1764

✓
A 2020 Qin petrol with no accident history had an intermittent SRS warning light. VDS read code B1764 (intermittent historical fault). Multiple measurements of right front side curtain airbag resistance showed normal readings (2.1Ω). No shorts or opens in the wiring harness; wiggling the harness did not reproduce the fault. Replaced the SRS control unit (ACU) and performed coding/matching. The fault did not return. Determined this was a false trigger caused by an intermittent fault in the control unit's internal sampling circuit.
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: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.