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B1767

DTC B1767 indicates an abnormally low-resistance connection between the right front side curtain airbag inflator circuit and the vehicle positive power supply terminal (B+), resulting in a short to power — Atto 8

Safety System

DTC B1767 indicates an abnormally low-resistance connection between the right front side curtain airbag inflator circuit and the vehicle positive power supply terminal (B+), resulting in a short to power.

Under normal conditions, the airbag inflator circuit maintains high impedance (open-circuit state, with resistance typically between 2-5Ω) and conducts only momentarily when the Airbag Control Unit (ACU) triggers it.

This fault indicates the airbag circuit may remain continuously energized even if the ACU does not issue a deployment command, causing two serious consequences: 1) The airbag may deploy unexpectedly during vehicle operation, causing serious occupant injury. 2) The system detects the abnormal voltage and enters protection mode, disabling the entire SRS system and preventing airbag deployment during a collision.

This hard short-circuit fault typically causes the SRS warning lamp to illuminate continuously.

Clearing the fault code will not resolve the issue.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD Song MAX right front side airbag short circuit after water wading

✓
A 2019 Song MAX had the SRS warning light stay on constantly after wading through heavy rain. Read DTC B1767. Inspection revealed standing water in the right C-pillar airbag connector with oxidised, blackened terminals. The right-side sunroof drain tube had detached, allowing rainwater to run down the A-pillar and into the C-pillar trim. Fix: Cleared water from the connector, cleaned the terminals with electronic cleaner and blew dry, reattached the sunroof drain tube. Fault resolved.
BYD DTC AI Analysis

Aftermarket dash cam installation damaged wiring harness on BYD Qin Pro

✓
While installing a dashcam, the owner of a 2020 Qin Pro drove cable-clip fasteners into the right-hand A-pillar SRS harness, damaging the airbag igniter wire insulation. This caused a short to constant power and set DTC B1767. Disconnecting the airbag module changed the code to open-circuit (high resistance), confirming a wiring fault. Repaired the harness by rewrapping the insulation and rerouted the dashcam wiring to avoid the SRS harness.
BYD DTC AI Analysis

Internal short circuit in Song PLUS airbag module

✓
A Song MAX had the SRS warning light suddenly come on during normal operation. The scanner showed B1767. No wiring harness damage or connector abnormalities found. Substituting an airbag simulator cleared the fault. Confirmed internal short in the right front side curtain airbag gas generator. Repair: Replaced the right front side curtain airbag module (requires headliner removal), then performed SRS system configuration and calibration. Fault resolved.
BYD DTC AI Analysis

BYD Qin DM SRS fault after accident repairs

✓
A Qin petrol model's SRS warning light remained on after right-side collision repairs. DTC B1767. Inspection found the airbag wiring harness had been crushed by right C-pillar trim clips during the repair, deforming it and causing an internal short to the power supply. Replaced the damaged harness section (from ACU to airbag module), rerouted the wiring properly and fitted harness protection sleeving. Fault resolved.
BYD DTC AI Analysis

Internal driver chip in SRS control unit damaged

✓
A 2019 Song MAX exhibited an intermittent SRS warning light during normal operation. Fault codes cleared initially but recurred; eventually B1767 became a permanent fault. Inspection confirmed the wiring harness and airbag module tested normal. Testing revealed continuity between the right front airbag drive terminal inside the ACU and the positive power supply. Resolution: Replaced the airbag control unit (ACU), programmed the VIN and calibrated the crash sensors using a dedicated diagnostic tool. Fault completely resolved.
Other Atto 8 Fault Codes
B1108For 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.B1109DTC B1109 indicates an open circuit in the communication line between the air conditioning system PM2.5 air quality sensor (dust concentration sensor) and the air conditioning control unit (AC ECU), or an open circuit within the sensor internal circuitry. Typically located in the air conditioning intake duct, this sensor monitors real-time PM2.5 particle concentration inside and outside the vehicle. It provides data to the automatic air conditioning system for intelligent switching between fresh air and recirculation modes and for controlling the air purification device. During an open circuit fault, the AC ECU cannot receive the air quality signal, triggering the system fail-safe mode. Symptoms typically include failure of the automatic recirculation function, abnormal air purification indicator light operation, or abnormal air quality data displayed on the air conditioning panel. Severe cases may compromise the cabin environment control strategy, but do not directly affect vehicle driving safety.B110913DTC B110913 indicates an open signal circuit for the PM2.5 rapid detector (in-cabin air quality sensor). This sensor typically mounts inside the air conditioning system intake duct. It monitors in-cabin PM2.5 concentration in real time and provides data to the automatic air conditioning system for intelligent control of the air purification function. The BYD diagnostic protocol uses sub-code '13' to specifically indicate an open signal circuit. Although this fault theoretically affects a comfort feature, BYD Qin series vehicles classify it as a Level 3 (severe) fault. This classification occurs because the air conditioning system interacts with the battery thermal management system (e.g., monitoring battery cooling intake air quality). The fault can disable the automatic air conditioning mode and prevent the air purification function from operating. In extreme cases, it affects the battery compartment intake air quality assessment, triggering the 'repair immediately' strategy.B110AThis DTC indicates interrupted CAN bus communication or abnormal data between the air conditioning control unit (ACU) and the PM2.5 air quality sensor. The PM2.5 sensor monitors particulate concentration inside and outside the vehicle and provides the basis for purification control in the automatic air conditioning system. The ACU triggers this fault if it fails to receive a valid CAN message from the sensor within the specified period (usually 100-500 ms), if message verification fails, or if the signal frame times out. Although this fault does not affect vehicle driving safety, it disables the automatic air purification function. The air conditioning system cannot automatically switch between recirculation and fresh air modes or activate the air purification mode based on air quality. A persistent fault may restrict the thermal management strategy.
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.