AU
B17141B

DTC B17141B indicates the right curtain airbag ignition circuit resistance exceeds the normal threshold set by the SRS control module (typically 3 — Seal U

Safety System

DTC B17141B indicates the right curtain airbag ignition circuit resistance exceeds the normal threshold set by the SRS control module (typically 3.0-5.0Ω, depending on vehicle calibration).

This active SRS system fault means the right curtain airbag may fail to deploy or experience delayed deployment during a collision.

Excessive resistance usually indicates a high-resistance point in the ignition circuit.

Potential causes include poor wiring contact, connector oxidation or corrosion, a partially broken wiring harness, or an internal open circuit in the curtain airbag module.

This fault illuminates the SRS warning light continuously and forces the system into degraded mode.

Extreme cases may compromise side-impact protection.

The B17141B fault code on the Seal U indicates a medium-severity SRS fault where the right curtain airbag ignition circuit has higher resistance than normal. This can cause delayed or failed airbag deployment in a side impact. Common causes include a loose or oxidized C-pillar/D-pillar connector or worn roof side rail wiring. The recommended fix is to visit an authorised dealer for diagnosis and repair. Typical repair cost data is available.
5
Cases Logged
5
Causes
Likely Causes — Seal U
  • 1Loose or oxidized right-hand C-pillar/D-pillar curtain airbag connector: Long-term vehicle vibration loosens the connector, or driving through water oxidizes the pins, increasing contact resistance.
  • 2Roof side rail internal wiring harness worn and broken: Repeated bending of the curtain airbag wiring harness at the door seal or A-pillar/C-pillar routing hole partially breaks the copper strands, creating high resistance.
  • 3Right curtain airbag module internal open circuit: A broken bridge wire inside the curtain airbag inflator or damp propellant causes abnormally high resistance.
  • 4SRS ECU internal detection circuit fault: Abnormal internal sampling resistor or ADC circuit in the control module falsely reports high curtain airbag resistance.
  • 5Wiring harness shorting bar not fully disengaged: when reconnecting the connector during servicing, the shorting bar fails to fully release, increasing series resistance.
What To Do
  • 1
    Safety preparation: Disconnect the 12V battery negative terminal and wait at least 90 seconds (some models require 180 seconds) to fully discharge the SRS capacitor and prevent accidental airbag deployment.
  • 2
    Read data stream: Use VDS or Launch X-431 to read the SRS system data stream. Record the current curtain airbag resistance value and historical freeze frame data. Confirm whether the fault is intermittent.
  • 3
    Visual inspection: Remove the right C-pillar trim panel and headliner edge. Check the curtain airbag module connector (usually a yellow plug) for looseness, water ingress, or oxidized pins.
  • 4
    Resistance measurement: Disconnect the battery negative cable and short it to body ground to discharge static electricity. Disconnect the curtain airbag module connector. Connect a 2.0Ω dedicated shorting resistor to the connector side (not the module side). Read the SRS data stream to verify if the resistance returns to normal to determine whether the fault lies in the module or the wiring harness.
  • 5
    Harness continuity test: Use a multimeter to measure the continuity resistance of the curtain airbag harness between the connector and the SRS ECU. Normal resistance is less than 1.0Ω. If resistance exceeds 1.5Ω, check the intermediate connector (usually in the right B-pillar or floor harness).
  • 6
    Insulation check: Measure the insulation resistance between the curtain airbag wiring harness and body ground. The resistance must be greater than 1MΩ to prevent hidden short circuits from causing abnormal resistance.
  • 7
    Component replacement: If the wiring harness is normal but the curtain airbag module resistance is abnormal (usually greater than 8Ω or infinite), replace the right curtain airbag module (install new fixing clips and T-bolts simultaneously).
  • 8
    System calibration: After replacement, perform 'SRS System Configuration' and 'Curtain Airbag Resistance Learning' (required for some newer models). Clear fault codes and perform a crash simulation test (use a dedicated resistor simulator to verify circuit integrity).
Real-World Cases
BYD DTC AI Analysis

Qin Pro DM: SRS warning light on after wading through water, right curtain airbag resistance abnormal

✓
2019 BYD Qin Pro DM. Airbag warning light stayed on after the vehicle drove through water. Scan tool read DTC B17141B. Live data showed right curtain airbag resistance 6.8 Ω (specification 2.0–3.5 Ω). Teardown found water inside the right C-pillar curtain airbag connector, with oxidized and blackened pins. Cleaned the pins with electronic contact cleaner, applied conductive grease, and reconnected the connector. Resistance returned to 2.4 Ω. Cleared the DTC; fault resolved. Recommend inspecting the door seals and applying waterproofing treatment.
BYD DTC AI Analysis

False high-resistance warning for curtain airbag after accident repair

✓
2018 Qin Pro petrol. After right-side accident repairs, DTC B17141B kept setting. Found the technician replaced the curtain airbag without removing the old T-bolt, so the new airbag connector could not seat fully. The internal shorting bar did not fully release, causing about 4 Ω contact resistance. Removed the airbag, extracted the old bolt, and fully locked the connector (heard the second click). Resistance returned to normal. Always use new fixing bolts when replacing curtain airbags.
BYD DTC AI Analysis

Wiring harness aged and broken, causing intermittent fault

✓
2019 BYD Qin Pro. SRS warning lamp illuminated intermittently, and DTC B17141B appeared as a history code. Static resistance tested normal but fluctuated during rough-road testing. Removed the roof rail trim and found the curtain airbag wiring harness insulation worn through at the B-pillar grommet, with only 2–3 copper strands remaining connected. Cut out the damaged section, soldered in an extension wire, and sealed with dual-wall heat shrink tubing. Rerouted the harness to avoid contact with metal edges. Fault completely resolved.
BYD DTC AI Analysis

Aftermarket curtain airbag module compatibility fault

✓
After fitting a non-genuine right-hand side curtain airbag to a 2018 BYD Qin Pro DM, DTC B17141B set. The new airbag's resistance measured 5.2Ω, exceeding the BYD SRS ECU calibration limit of 4.5Ω. Fitted a genuine replacement (2.8Ω) and the fault cleared. The aftermarket part's bridge wire material or diameter difference caused the higher base resistance. Use only genuine parts for airbag systems to keep resistance values within the ECU's recognition range.
BYD DTC AI Analysis

SRS ECU internal sampling circuit fault misdiagnosis

✓
Multiple models logged DTC B17141B. Replaced the curtain airbag and wiring harness, but the fault persisted. Used an oscilloscope to check the SRS ECU curtain airbag drive terminal waveform and found abnormal sampling voltage. Replaced the SRS control module (requires reprogramming the VIN and configuration codes) and resolved the fault. An aging precision resistor inside the ECU caused the resistance sampling reference to shift. This is a rare case; rule out all wiring faults before considering this.
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.