AU
B1712-00

This DTC indicates the RH Curtain Shield Airbag igniter circuit resistance measures 0 Ω, indicating a typical short circuit — Atto 3

Safety System

This DTC indicates the RH Curtain Shield Airbag igniter circuit resistance measures 0 Ω, indicating a typical short circuit.

Normal airbag igniter resistance is 2.0-5.0 Ω.

A 0 Ω resistance typically indicates a short to ground in the igniter circuit (damaged harness insulation), a short to power (contact with constant power), or a shorted driver transistor inside the airbag control module (SRS ECU).

This fault forces the SRS system into fail-safe mode: the affected airbag will not deploy during a collision (the short circuit diverts the deployment current), and the airbag warning lamp illuminates continuously.

Some models simultaneously disable the front seat belt pretensioners and the corresponding side airbag.

The short circuit also carries a minimal risk of unintended deployment.

Immediately remove the vehicle from service for repair.

The B1712-00 fault code on the Atto 3 indicates a medium-severity short circuit in the right curtain shield airbag igniter circuit. This can stop the affected airbag from deploying and keep the airbag warning light on. Common causes include a chafed or pinched wiring harness near the C-pillar or headliner, or a corroded airbag connector. The vehicle should be taken to an authorised dealer for diagnosis and repair. Typical repair cost data is available.
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Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Right curtain airbag wiring harness chafed or pinched at the C-pillar trim panel or headliner retaining strip, causing the wire to short to body ground.
  • 2Airbag connector (usually located in the right C-pillar or front of the headliner): Short circuit caused by fused internal terminals, electrolytic corrosion from water ingress, or metal debris.
  • 3Internal short circuit in the right curtain airbag igniter (gas generator bridge wire insulation breakdown). Commonly occurs after vehicle wading or when the airbag exceeds its service life.
  • 4SRS ECU internal driver circuit fault (power transistor breakdown) or software calibration error causing abnormal resistance sampling.
  • 5Improper repair procedure: Using an analog multimeter or low-impedance digital meter to directly measure the airbag terminals generates high current, burning out the igniter or logging a false short circuit.
What To Do
  • 1
    Safety preparation: Disconnect the 12V battery negative terminal and wait at least 90 seconds for the SRS backup power capacitor to discharge fully. Remove the smart key and place it 3 metres away.
  • 2
    Initial inspection: Remove the right C-pillar trim panel and right headliner trim panel. Visually inspect the curtain airbag wiring harness (yellow sleeve) for wear, cuts, or pinch marks. Focus on the C-pillar hinge area and headliner wiring harness retaining clip locations.
  • 3
    Connector diagnosis: Disconnect the SRS ECU (located under the centre console or in the front compartment) and the right curtain airbag connector (usually a yellow 2-pin plug). Check terminals for backing out, corrosion, verdigris, or metal debris. Clean with electrical contact cleaner if necessary.
  • 4
    Harness continuity test: Use a high-impedance digital multimeter (≥10MΩ) to measure the airbag circuit-to-ground resistance. Standard value: ≥1MΩ. Measure end-to-end harness continuity and confirm no short to ground or short to power.
  • 5
    Airbag module isolation test: Use a dedicated airbag simulator (2Ω/0.25W) in place of the right curtain airbag. Connect the diagnostic tool to clear the fault code and read the codes again. If B1712-00 disappears, the airbag module has an internal short circuit. Replace the right curtain airbag assembly.
  • 6
    SRS ECU check: If the wiring harness and airbag module are normal, measure the resistance between the corresponding pins on the SRS ECU. If the resistance remains 0 Ω, replace the SRS control module and write the Vehicle Identification Number (VIN) and configuration coding.
  • 7
    System verification: Restore all connections, turn on the power, and use the dedicated diagnostic tool to perform the 'SRS System Self-Diagnosis' and 'Crash Output Test' (simulation test). Confirm the current fault code becomes a historical fault and no new intermittent fault codes appear.
Real-World Cases
BYD DTC AI Analysis

C-pillar wiring harness chafing caused an intermittent short circuit

✓
A 2018 Qin EV450 had an intermittent SRS warning light on the instrument cluster. Read DTCs: B1712-00 (current) and B1712-00 (history). Removed the right C-pillar trim and found the airbag harness had chafed against the seatbelt anchor bolt, wearing through the insulation and causing intermittent contact with the chassis. Repaired the damaged harness using heat-resistant insulation tape and corrugated conduit as dual protection, then rerouted the harness away from sharp metal edges. No recurrence over three months of follow-up.
BYD DTC AI Analysis

Connector corroded and shorted after wading

✓
2019 model year E1. After the vehicle drove through water, the airbag warning light stayed on. The scan tool retrieved DTC B1712-00. The right curtain airbag connector measured 0.3Ω resistance to ground. Inspection found the connector seal below the right A-pillar had deteriorated; water ingress after the crossing caused electrolytic shorting between terminals. Repair: Replaced the connector assembly (including waterproof seal), dried the wiring harness, and replaced the SRS ECU (because water exposure may have damaged the internal sampling circuit). Total cost around 3,200 yuan.
BYD DTC AI Analysis

Airbag module internal short misdiagnosis case

✓
2017 BYD Qin 100. Set DTC B1712-00 after accident repair. An independent shop replaced the right curtain airbag, but the fault persisted. Detailed inspection revealed both old and new airbags were functional; the collision damaged the SRS ECU's internal driver chip, causing continuous low-impedance output. Testing with an airbag simulator confirmed the ECU fault. Replaced the airbag control module and recalibrated it to resolve the issue. Key lesson: Replacing the airbag without first using a simulator is blind parts swapping.
BYD DTC AI Analysis

改装导致的线束挤压故障

✓
用户改装顶棚氛围灯时，固定线束的卡钉刺穿了右侧帘式气囊线束的黄色护套，导致两根导线同时短路且对地短路。症状为改装后次日即亮气囊灯。维修时需更换整个顶棚线束总成（因气囊线束禁止接续），并告知用户私自改装导致安全气囊系统损坏，不在质保范围内。
BYD DTC AI Analysis

Phantom fault caused by software false positive

✓
2020 BYD E1. Intermittent DTC B1712-00 occurred on cold start and cleared itself once warm. Checked wiring harness and airbag measurements; both normal. Suspected SRS ECU software bug (sampling circuit drift at low temperatures in early software versions). Upgraded SRS control module software to V2.3.5, then monitored continuously for two weeks—no recurrence. These phantom faults are common in early BYD EV models; check the software version first.
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.