AU
B1712-00

This DTC indicates the RH Curtain Shield Airbag igniter circuit resistance measures 0 Ω, indicating a typical short circuit — Atto 8

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.

5
Cases Logged
5
Causes
Likely Causes — Atto 8
  • 1Wear or pinching of the right curtain airbag wiring harness at the C-pillar trim panel or roof lining retaining strip causes the wire to short to body ground.
  • 2Airbag connector (usually located at the right C-pillar or front of the headliner): fused internal terminals, electrolytic corrosion from water ingress, or short circuit caused by metal foreign objects.
  • 3Internal short circuit in the right curtain airbag igniter (gas generator bridge wire insulation breakdown). Commonly occurs after vehicle wading or exceeding the airbag service life.
  • 4SRS ECU internal driver circuit fault (power transistor breakdown) or software calibration error causing abnormal resistance sampling.
  • 5Improper repair procedure: Directly measuring airbag terminals with an analog multimeter or low-impedance digital meter 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 to ensure the SRS backup power capacitor fully discharges; remove the smart key and place it 3 meters away.
  • 2
    Initial inspection: Remove the right C-pillar trim panel and the right roof trim panel. Visually inspect the curtain airbag wiring harness (yellow sleeve) for wear, cuts, or crush marks. Focus on the C-pillar hinge area and the roof wiring harness retaining clip locations.
  • 3
    Connector diagnosis: Disconnect the SRS ECU (located under the center console or in the front compartment) and the right curtain airbag connector (usually a yellow 2-pin plug). Inspect the terminals for back-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. The standard value must be ≥1MΩ. Measure continuity between both ends of the harness and confirm no short to ground or power.
  • 5
    Airbag module isolation test: Install a dedicated airbag simulator (2Ω/0.25W) in place of the right curtain airbag. Connect the diagnostic tool, 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 inspection: If the wiring harness and airbag module are normal, measure the resistance between the corresponding pins on the SRS ECU. If the resistance remains 0Ω, 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 changes to a history 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 8 Fault Codes
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.B110A02DTC B110A02 indicates the thermal management master control unit (HVAC ECU) or body control module (BCM) failed to receive valid CAN data frames from the PM2.5 air quality sensor over consecutive communication cycles (typically 500ms per cycle). The sensor typically mounts at the HVAC unit air inlet or behind the glove box and transmits real-time particulate concentration data (unit: μg/m³) to the HVAC controller via the CAN bus. The fault is essentially a communication link layer timeout. Potential causes include physical layer wiring faults, sensor power supply failures, sensor internal MCU lockup, or CAN network topology damage. Although this non-critical fault does not directly affect driving safety, it disables the intelligent air purification strategy and the automatic fresh air/recirculation switching function. In extreme cases, it triggers a thermal management system degraded mode, limiting compressor power or fixing the air flap position.B110B07This fault code indicates abnormal operation of the internal air pump (sampling pump) in the PM2.5 air quality detection module. The PM2.5 detector uses the laser scattering principle to measure particulate concentration and requires a built-in air pump to draw ambient air into the detection chamber at a constant flow rate. The ECU sets this code when it detects an open or short in the air pump drive circuit, abnormal current (stall or free-running), or abnormal speed feedback. This fault causes the automatic air conditioning system to lose air quality sensing capability, preventing automatic switching between fresh air and recirculation modes. The instrument cluster air quality display may show '--' or a fixed value, but the fault does not affect the vehicle powertrain or basic air conditioning cooling and heating functions.B173CDTC B173C indicates the Supplemental Restraint System (SRS) detects the Right Second Row Side Airbag squib circuit resistance exceeds the calibrated threshold (typically >4.5Ω). This fault is an active diagnostic result of the SRS system, indicating a high-resistance condition in the circuit between the Airbag Control Unit (ACU) and the airbag module. Causes for excessive resistance include increased contact resistance, a partially broken wiring harness, terminal oxidation, or an aging squib wire inside the airbag module. This fault causes the system to mark the airbag circuit as 'unreliable', meaning the airbag may fail to deploy during a collision. The fault typically illuminates the instrument cluster airbag warning light (SRS light) continuously, and some models also sound a warning buzzer.
Common problems reported for Atto 8 →Atto 8 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.