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B1714

DTC B1714 indicates the SRS (Supplemental Restraint System) control unit detects the right curtain airbag (head protection curtain/side curtain) inflator circuit resistance remains above the calibrated threshold (normal range typically 1 — Qin Plus

Safety System

DTC B1714 indicates the SRS (Supplemental Restraint System) control unit detects the right curtain airbag (head protection curtain/side curtain) inflator circuit resistance remains above the calibrated threshold (normal range typically 1.5-3.5 Ω, depending on vehicle calibration).

The SRS ECU periodically monitors each airbag inflator's resistance via an internal Wheatstone bridge or constant-current source circuit.

Excessive resistance indicates a high-impedance point in the inflator circuit.

Potential causes include poor connector contact, a partial open circuit in the wiring harness, or an aging inflator.

This constitutes a hard or intermittent fault.

During a side impact, the right curtain airbag may fail to deploy within the specified time (delayed deployment) or fail to deploy entirely.

The system illuminates the airbag warning light, and the front side airbags and seat belt pretensioners may enter fail-safe mode.

The B1714 fault code on the Qin Plus indicates the SRS control unit has detected excessive resistance in the right curtain airbag inflator circuit. Severity is medium because the airbag may deploy late or not deploy in a side impact. Common causes include a loose or corroded curtain airbag connector, or damaged wiring near the A-pillar/C-pillar trim. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available from recorded cases.
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Cases Logged
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Causes
Likely Causes — Qin Plus
  • 1Right-side curtain airbag connector (usually located inside the C-pillar trim panel or at the rear of the roof side rail) is loose, has backed-out terminals, or is corroded, causing increased contact resistance (common in vehicles with water wading or high-humidity exposure).
  • 2Repeated removal and installation or pulling during seat adjustment partially severs the internal copper wires of the airbag wiring harness at the A-pillar/C-pillar trim panel transition area, resulting in a high-resistance intermittent connection.
  • 3Aging or a batch defect in the right curtain airbag inflator squib causes internal resistance to increase abnormally as temperature rises.
  • 4Enlarged SRS control unit (ACU) connector pin sockets or oxidized terminal surfaces add sensing circuit contact resistance to the curtain airbag circuit.
  • 5Vehicle modification work (such as window tinting or routing dash cam wiring) accidentally damaged or pinched the right curtain airbag wiring harness, causing hidden damage.
What To Do
  • 1
    Safety preparation: Disconnect the low-voltage battery negative terminal and wait at least 90 seconds (to ensure the SRS capacitor discharges completely). Never measure the airbag circuit while energized.
  • 2
    Initial diagnosis: Use VDS or a dedicated diagnostic tool to read complete DTC information and freeze frame data. Confirm whether B1714 is a current or historical fault. Record the ambient temperature at the time of occurrence (low temperatures may affect contact resistance).
  • 3
    Visual inspection: Remove the right C-pillar trim, rear edge of the headliner, and D-pillar trim (depending on vehicle model). Verify the curtain airbag module connector (usually marked R-CAB or R-SAB) is fully locked. Inspect the pins for green oxidation, burn marks, or backed-out pins.
  • 4
    Harness continuity test: Disconnect the wiring harness from the SRS ECU connector. Use a low-impedance multimeter (0.1 Ω resolution) to measure harness resistance from the ECU connector to the curtain airbag connector. Normal resistance is less than 0.5 Ω. If resistance exceeds 1 Ω, closely inspect the A-pillar and C-pillar harness transition points (usually equipped with yellow shorting bars or adapter connectors).
  • 5
    Curtain airbag unit test (qualified personnel only): With the vehicle completely powered down, measure the curtain airbag inflator resistance using a dedicated airbag tester (or the equivalent resistance substitution method specified in the repair manual). If the resistance exceeds 3.8Ω or is unstable, replace the right curtain airbag assembly.
  • 6
    Swap test (if supported): If the left and right curtain airbags are the same model, carefully swap the left and right connectors (for diagnostics only; verify no risk of airbag deployment). Check if the fault code transfers to the left side to determine if the fault is in the curtain airbag or the wiring harness.
  • 7
    Repair and verification: Clean the oxidized connector (use electronic contact cleaner; never sand gold-plated terminals). Replace the connector or curtain airbag if necessary. Restore all connections, power on the vehicle, and clear the fault code. Execute the 'Collision Output Test' or use the diagnostic tool's 'SRS self-test' function. Confirm the current fault changes to a 'historical fault' and can be cleared. Finally, perform a road test to verify the fault does not return.
Real-World Cases
BYD DTC AI Analysis

Corroded C-pillar connector causing intermittent high resistance

✓
A 2019 BYD Yuan EV came in with an intermittent SRS warning light on the instrument panel. DTC B1714 was intermittent. Inspection found the vehicle had been through water. The right C-pillar curtain airbag connector showed green copper corrosion inside. Since the connector sits at the bottom of the C-pillar, water can easily enter during wading. After cleaning the connector and applying conductive grease, the resistance returned to normal. Advised the owner to check the door seals to prevent further water entry.
BYD DTC AI Analysis

Loose wiring harness connection after accident repair caused fault

✓
2021 BYD Tang. DTC B1714 kept returning after right rear-side accident repairs. The accident required sheet metal repairs to the right B and C pillars; during the repairs, the curtain airbag harness was stretched. Inspection found 80% of the copper strands fractured at the B-pillar trim clip, with only a few strands left connected, causing high resistance. Replaced the damaged harness section using genuine OEM yellow airbag wire — never substitute standard wire. Fault resolved.
BYD DTC AI Analysis

Curtain airbag internal resistance aged beyond specification

✓
A 2020 Qin petrol variant with 80,000 km had a constant SRS light and current DTC B1714. Harness continuity was normal at 0.3Ω. The curtain airbag resistance measured 4.2Ω cold (out of spec) and 6.5Ω hot, indicating aged initiator resistance in the gas generator. Replaced the right curtain airbag assembly (requires headliner removal; note curtain roll direction), then coded the module and cleared the fault.
BYD DTC AI Analysis

Enlarged SRS ECU connector pin sockets causing poor contact

✓
2019 BYD Song MAX. Intermittent B1714 DTC, temporarily disappeared after reseating the connector. Further inspection found enlarged terminal sockets on the SRS control unit (beneath the centre console) for the curtain airbag circuit, causing insufficient contact pressure with the curtain airbag terminals. Restored terminal clamping force using a specialised terminal removal tool, or replaced the entire SRS ECU connector housing. Fault permanently resolved.
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.