AU
B1714-00

DTC B1714-00 indicates the airbag control unit (SRS ECU) detects the circuit resistance of the RH Curtain Shield Airbag inflator (gas generator) exceeds the calibrated threshold — Qin Plus

Safety System

DTC B1714-00 indicates the airbag control unit (SRS ECU) detects the circuit resistance of the RH Curtain Shield Airbag inflator (gas generator) exceeds the calibrated threshold.

The normal range is typically 1.5Ω–2.5Ω; an excessive value generally indicates >3.5Ω or a near open circuit.

The SRS ECU periodically measures this resistance using a low-current signal.

Increased resistance indicates poor circuit contact, wiring oxidation, a partially broken wiring harness, or an aging/broken bridge wire inside the inflator.

This fault may prevent the RH Curtain Shield Airbag from deploying properly during a collision, degrading passive safety system function.

The SRS warning lamp illuminates continuously and the system enters fail-safe mode (which may disable this circuit's trigger function to prevent unintended deployment).

The B1714-00 fault code on the Qin Plus indicates high resistance in the right-hand curtain airbag inflator circuit, which may stop that airbag from deploying correctly. Severity is medium because it affects the SRS safety system and usually turns on the airbag warning light. Common causes include an aging inflator or a loose, oxidized, or backed-out yellow airbag connector near the B-pillar/headliner. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available.
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Cases Logged
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Causes
Likely Causes — Qin Plus
  • 1Right curtain airbag inflator internal resistance increased due to aging, or bridge wire nearly broken (precursor to internal open circuit).
  • 2Oxidation, loose connection, or terminal back-out at the yellow airbag connector inside the B-pillar or headliner (usually located at the junction of the A-pillar upper trim and headliner), causing increased contact resistance.
  • 3Vehicle modifications (such as installing a dash cam or removing/installing the roof trim) pinch, chafe, or partially break the roof wiring harness, increasing circuit resistance.
  • 4Fault in the SRS control unit internal sampling circuit or A/D converter causing abnormal resistance readings (software calibration drift or hardware fault)
  • 5Water ingress or high-humidity environments corrode the curtain airbag connector terminals (usually located above the right B-pillar or along the headliner), forming an oxide layer that increases contact resistance.
What To Do
  • 1
    Use the BYD VDS2000 or Launch X-431 diagnostic tool to read complete fault codes and freeze frame data. Record the ambient temperature and voltage when the fault occurred, and confirm whether the fault is intermittent.
  • 2
    Perform the safe power-down procedure: turn off the ignition switch, disconnect the battery negative terminal, and wait at least 90 seconds (to ensure the SRS capacitor fully discharges). Do not operate any electrical equipment during this time.
  • 3
    Remove the right A-pillar upper trim, B-pillar upper trim, and the front right edge of the headliner. Verify the right curtain airbag yellow connector (usually marked 'R Curtain' or 'CAB RH') is fully locked. Inspect the terminals for green oxidation, burn marks, or backed-out pins.
  • 4
    Use a dedicated airbag resistance meter (low-current type, test current <1mA) to measure the resistance between the two gas generator terminals: if the resistance is >3.5Ω or reads OL (open circuit), replace the right curtain airbag assembly; if the resistance is between 2.5 and 3.5Ω, it indicates critical aging; recommend replacing the assembly.
  • 5
    Disconnect the SRS ECU connector (located under the center console or center tunnel). Measure the continuity (should be <1Ω) and insulation (resistance to ground should be >1MΩ) of the wiring harness between the ECU and the curtain airbag. Inspect the wiring harness for high-resistance points or hidden open circuits.
  • 6
    If the wiring harness and curtain airbag are normal, inspect the SRS ECU connector pins for oxidation or bending. If necessary, repair the terminals using the dedicated wiring harness repair tool, or update the SRS ECU software to the latest version.
  • 7
    After completing the repair, reconnect all connectors and the battery. Clear the fault codes, turn the ignition switch to ON, and verify the SRS warning lamp turns off normally after 6 seconds. Use the diagnostic tool to perform the 'Airbag System Self-check' and 'Collision Output Check'. Confirm DTC B1714-00 does not return and the system status displays 'Normal'.
Real-World Cases
BYD DTC AI Analysis

Qin EV300 right-side curtain airbag unit resistance drift due to aging

✓
A 2017 Qin EV300 with 80,000 km had a constant SRS warning light on the instrument panel. Technicians retrieved DTC B1714-00. Resistance at the right side curtain airbag connector measured 4.2 Ω (excessive). Removal and inspection of the wiring harness showed normal continuity. Replacing the right side curtain airbag assembly restored resistance to 1.8 Ω and cleared the fault. Analysis indicates the bridge wire inside the gas generator oxidised due to long-term temperature cycling, gradually increasing resistance to the alarm threshold.
BYD DTC AI Analysis

Oxidation on the B-pillar connector increased contact resistance

✓
2018 Qin EV450 triggered DTC B1714-00 after water ingress. Inspection revealed water stains and copper oxide inside the airbag connector (yellow double-lock plug) behind the right B-pillar upper trim. Cleaned the terminals and applied dedicated airbag contact enhancer, reducing resistance from 5.6Ω to 1.6Ω. Recommend checking all airbag connector seals on vehicles that have been in water, and replacing waterproof sealing rings where necessary.
BYD DTC AI Analysis

Headliner wiring harness chafing causing hidden high resistance.

✓
A 2017 Qin 100 developed intermittent DTC B1714-00 after an aftermarket panoramic sunroof installation. Investigation found a screw had pinched the right-side headliner wiring harness during the modification, leaving the internal copper conductors partially fractured but not completely severed. Resistance read 2.0Ω when cold but jumped to 3.8Ω due to thermal expansion and contraction. Replaced the damaged harness section (A-pillar to curtain airbag) and eliminated the fault.
BYD DTC AI Analysis

SRS ECU software false alarm causes resistance detection deviation.

✓
A 2017 Qin 80 set code B1714-00 with no collision history. The curtain airbag resistance measured 1.7 Ω (normal) and the wiring harness was normal. VDS check found the SRS ECU software was an early version with a sampling circuit calibration bug. After updating the SRS control unit software to a post-2019 version (some models require an improved ECU), the fault code did not reappear. This confirmed that aging of the control unit hardware sampling circuit caused the high resistance reading.
Other Qin Plus 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.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.B110BDTC B110B indicates a fault in the internal air pump (sampling pump) of the PM2.5 air quality detector. This pump draws cabin or outside air into the PM2.5 sensor detection chamber, enabling the laser scattering sensor to measure real-time particulate matter concentration. The air conditioning controller (or BCM) sets this DTC upon detecting an open or short circuit in the pump drive circuit, or abnormal current caused by a seized pump motor. This fault disables the "Green Clean" system, causes the instrument cluster air quality display to read abnormally or disappear, and disables the automatic fresh air/recirculation switching function. It does not affect the vehicle powertrain or core thermal management functions.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.B173BDTC B173B indicates an abnormal electric A/C compressor speed feedback signal or a communication fault between the compressor controller and the motor. In BYD new energy models (e.g., Tang, Song, Qin, and Yuan series), this DTC belongs to the HVAC subsystem within the Body Control system and specifically involves the electric compressor closed-loop control circuit. The ECU sets this DTC when the compressor controller (IPM) fails to receive a valid pulse signal from the Hall speed sensor for more than 3 continuous seconds, or when the deviation between the detected actual speed and the target commanded speed exceeds the calibrated threshold (typically >500 rpm). This fault forces the A/C system into fail-safe mode and stops compressor operation. Symptoms include a complete lack of cooling, intermittent cooling, or a sharp decrease in cooling performance. The instrument cluster A/C warning lamp may also illuminate. Prolonged operation with this fault can degrade high-voltage system insulation or cause controller overcurrent damage.
Common problems reported for Qin Plus →Qin Plus 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.