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 — Seal 6 EV

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).

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Cases Logged
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Causes
Likely Causes — Seal 6 EV
  • 1Right-side 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 in the B-pillar or headliner (usually located at the junction of the A-pillar upper trim and headliner), causing increased contact resistance.
  • 3Roof wiring harness pinched, chafed, or partially broken during vehicle modifications (such as dash cam installation or roof trim removal/installation), increasing circuit resistance.
  • 4Fault in the SRS control unit internal sampling circuit or A/D converter causes abnormal resistance readings (software calibration drift or hardware fault).
  • 5Vehicle wading or high-humidity environments cause corrosion on the curtain airbag connector terminals (typically located above the right B-pillar or along the side of the headliner), forming an oxide layer that increases contact resistance.
What To Do
  • 1
    Use a 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 verify if 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 (ensuring 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 terminals of the gas generator. If the resistance is >3.5Ω or displays OL (open circuit), replace the right side curtain airbag assembly. If the resistance is between 2.5 and 3.5Ω, it indicates marginal aging; recommend replacement.
  • 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 from the ECU to 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 the repair, reconnect all connectors and the battery. Clear the fault code, turn the ignition switch to ON, and verify the SRS warning light turns off after 6 seconds. Use the diagnostic tool to perform the 'Airbag System Self-check' and 'Collision Output Check'. Confirm 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 Seal 6 EV 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.B1737DTC B1737 indicates the Supplemental Restraint System (SRS) detected abnormal continuity between the right middle-row side airbag squib circuit (typically the second-row right seat side airbag or right curtain airbag) and the vehicle power supply (B+, battery positive). The SRS ECU monitors the airbag inflator resistance via an internal current source (normal resistance: 2.0–3.0 Ω). If the ECU detects the voltage across the inflator circuit remaining close to battery voltage (>5 V and approaching 12 V) instead of the expected low potential or floating state, it identifies a short to power. This fault prevents the airbag from deploying normally during a collision because the short circuit bypasses the firing current. In extreme cases, abnormal current can cause unintended deployment, posing a severe safety hazard.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 Seal 6 EV →Seal 6 EV 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.