AU
B1741-00

DTC B1741-00 indicates the airbag system (SRS) control module detected a short to ground in the Left Rear Side Airbag deployment circuit — Atto 3

Safety System

DTC B1741-00 indicates the airbag system (SRS) control module detected a short to ground in the Left Rear Side Airbag deployment circuit.

The SRS ECU continuously monitors the airbag inflator resistance via its internal diagnostic circuit (normal range: 2.0-3.0 ohms).

When the system detects an abnormally low circuit resistance (near 0 ohms) or a short-to-ground path, it logs a short-to-ground fault.

This fault prevents the affected airbag from deploying during a collision or, in extreme cases, risks unintended deployment due to wiring faults.

Consequently, the SRS immediately illuminates the airbag warning lamp and disables the entire airbag system to protect occupants.

The B1741-00 fault code on the Atto 3 indicates a high-severity fault in the SRS airbag system: a short to ground in the left rear side airbag deployment circuit. This may stop the airbag from deploying and can disable the airbag system. Common causes include damaged under-seat airbag wiring or water/corrosion in the SRS connector. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available.
3
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Damaged or worn left rear seat side airbag wiring harness: Frequent fore/aft seat adjustment or passenger entry/exit wears through the harness insulation at seat frame friction points. The wire contacts the vehicle body metal, creating a short to ground.
  • 2Water ingress or corrosion in the under-seat wiring harness connector: Liquid seeps into the yellow SRS connector under the left rear seat during interior cleaning, causing a short circuit between terminals or a short to ground.
  • 3Airbag igniter internal fault: Short circuit in the internal igniter element of the left rear side airbag module. Possible causes include a manufacturing defect or hidden damage from failing to replace the module after a vehicle accident.
  • 4Improper seat modification or repair: Retaining screws piercing or pinching the wiring harness during the installation of aftermarket seat heating pads, leather upholstery, or seat repairs, causing insulation damage.
  • 5SRS ECU internal diagnostic circuit fault: In very rare cases, the airbag control module internal monitoring circuit falsely reports a fault. Rule out by substitution.
What To Do
  • 1
    Safety Preparation: Disconnect the 12V battery negative terminal. Wait at least 3 minutes to discharge the residual SRS capacitor charge and prevent accidental airbag deployment.
  • 2
    Visual inspection: Remove the left rear seat and side trim panel. Check the yellow SRS wiring harness for obvious damage or crush marks, focusing on the harness fixing points and bends near the seat rail.
  • 3
    Connector inspection: Disconnect the left rear side airbag module connector (usually located below the seat backrest or near the C-pillar) and inspect the terminals for corrosion, water ingress, or metallic debris.
  • 4
    Resistance measurement: Use a multimeter to measure the airbag-side wiring harness resistance to ground (must be greater than 10kΩ or infinite). A resistance near 0Ω indicates a wiring harness short to ground. Measure the airbag module resistance (must be 2.0-3.0Ω). Replace the airbag module if the resistance falls outside this range.
  • 5
    Wiring harness repair: If the wiring harness is damaged, use high-temperature insulating tape or replace the entire wiring harness section (simple wrapping is prohibited). Ensure sufficient clearance between the wiring harness and the seat frame, and re-secure the harness.
  • 6
    Replacement verification: If the wiring harness is normal but the fault persists, replace the left rear side airbag module to cross-verify.
  • 7
    System reset: After repair, reconnect all connectors and the battery. Use a dedicated BYD diagnostic tool (VDS or ED400) to clear the fault code and perform an SRS system self-check. Verify DTC B1741-00 does not return and the airbag warning light turns off.
Real-World Cases
BYD DTC AI Analysis

Seat adjustment on a Qin EV450 caused wiring harness wear and a short circuit.

✓
A 2018 Qin EV450 with 42,000 km displayed a constant airbag warning light on the dashboard. Technicians retrieved DTC B1741-00. Removing the left rear seat revealed interference between the left edge of the seat frame and the SRS wiring harness retaining clip. Long-term seat adjustment chafed through the harness insulation, exposing copper conductors and causing a short to earth where they contacted the metal seat frame. Repair: replaced a 30 cm section of damaged wiring, rerouted the harness and added abrasion-resistant corrugated tubing, and fitted a rubber edge guard over the sharp frame edge to prevent further wear. Cleared the fault code and the system returned to normal.
BYD DTC AI Analysis

Qin 100 airbag short circuit after interior cleaning

✓
2017 BYD Qin 100. After a deep interior cleaning at a car wash, the airbag warning light came on the next day. The diagnostic tool displayed code B1741-00. Technicians found water stains inside the SRS connector (yellow 2-pin) under the left rear seat, with terminals oxidised and blackened. During cleaning, the high-pressure water gun sprayed directly into the seat gaps, allowing water to enter the connector and cause a short circuit. They thoroughly cleaned the connector with electronic contact cleaner, blow-dried it, and applied conductive anti-corrosion grease. They sealed the connector with waterproof tape and checked the airbag module resistance (normal). Clearing the fault codes resolved the fault.
BYD DTC AI Analysis

Airbag fault triggered by aftermarket heated seat modification

✓
A 2017 Qin 80 developed DTC B1741-00 following installation of rear seat heating at a third-party workshop. Inspection found metal retainers securing the seat upholstery had pierced the left rear side airbag harness while fitting the heating pads, damaging two wires and causing a short to earth. Technicians removed the heating pads, replaced the damaged SRS harness (complete section from main harness branch point to airbag module), and rerouted the wiring to avoid the heating pad mounting points. They recommended using genuine parts or professional retrofit solutions if seat heating is needed.
Other Atto 3 Fault Codes
P0AA6Hybrid Battery Voltage System Isolation FaultB1108For 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.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.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.B173A1ADTC B173A1A indicates the right middle-row side airbag (typically located on the side of the right second-row seat or inside the C-pillar trim panel) igniter circuit resistance measures 0 Ω. In the Supplemental Restraint System (SRS), normal airbag igniter resistance ranges between 2.0 and 5.0 Ω. A resistance of 0 Ω indicates a short to ground or a short between circuit wires, preventing the Airbag Control Unit (ACU) from establishing a normal monitoring circuit. This safety-critical fault prevents the airbag from deploying during a collision, continuously illuminates the instrument panel SRS warning lamp, and may force the entire airbag system into fail-safe mode.
Common problems reported for Atto 3 →Atto 3 overview →
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.