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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).

4
Cases Logged
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
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.