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 U

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 Seal U indicates the SRS ECU has detected excessive resistance in the right-hand curtain shield airbag inflator circuit. This is a medium-severity fault because it may stop that airbag from deploying correctly in a crash. Common causes include an aging or failing inflator bridge wire, or oxidized, loose, or backed-out airbag connector terminals. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available from 4 recorded cases.
4
Cases Logged
5
Causes
Likely Causes — Seal U
  • 1Increased internal resistance of the right curtain airbag inflator 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 roof lining (usually located where the A-pillar upper trim meets the roof lining), resulting in increased contact resistance.
  • 3Vehicle modification work (such as installing a dash cam or removing and installing the headlining) pinched, abraded, or partially broke the roof wiring harness, increasing circuit resistance.
  • 4SRS control unit internal sampling circuit or A/D converter fault causing abnormal resistance readings (software calibration drift or hardware fault)
  • 5Water ingress or high humidity corrodes the curtain airbag connector terminals (usually located above the right B-pillar or side of 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 the complete fault codes and freeze frame data. Record the ambient temperature and voltage when the fault occurred, and confirm 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 (to fully discharge the SRS capacitor). 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 displays OL (open circuit), replace the right curtain airbag assembly. If the resistance is between 2.5 and 3.5Ω, it indicates borderline aging; recommend replacement.
  • 5
    Disconnect the SRS ECU connector (located under the center console or center tunnel). Measure the continuity (<1Ω) and insulation resistance to ground (>1MΩ) of the wiring harness between the ECU and the curtain airbag. Inspect the wiring harness for high-resistance points or intermittent 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 light turns off normally after 6 seconds. Use the diagnostic tool to perform '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 U Fault Codes
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.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.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.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.B173712DTC B173712 indicates a short to power in the firing circuit of the right second-row side airbag module in the Supplemental Restraint System (SRS). Specifically, the "right second-row side airbag" typically refers to the side impact airbag located in the right B-pillar or the side of the right seat. The "12" suffix indicates a circuit short to battery positive (B+). This fault causes the following conditions: 1) The airbag may fail to ignite and deploy during a collision, resulting in a loss of side impact protection. 2) In extreme cases, unintended triggering may cause accidental airbag deployment. 3) The SRS control unit detects abnormally high circuit voltage (typically above 4.5V) and enters fault protection mode. This may disable the entire airbag system and continuously illuminate the instrument cluster airbag warning light.
Common problems reported for Seal U →Seal U 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.