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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 — Seal U

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.

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Cases Logged
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 Seal U 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.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.
Data confidence: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.