AU
B1713-00

DTC B1713-00 indicates the airbag control unit (SRS ECU) detects the right curtain shield airbag ignition circuit resistance falls below the system-calibrated minimum threshold (typically below 1 — Seal U

Safety System

DTC B1713-00 indicates the airbag control unit (SRS ECU) detects the right curtain shield airbag ignition circuit resistance falls below the system-calibrated minimum threshold (typically below 1.0Ω; normal range is 1.5-3.0Ω).

Low resistance usually indicates an abnormally low-resistance path in the ignition circuit.

Possible causes include an internal inflator short circuit within the curtain airbag module, a wiring harness short to ground, grounded internal connector pins, or a wire-to-wire short.

This fault prevents normal airbag deployment (failure to inflate during a collision) or, in extreme cases, creates a risk of unintended deployment.

This critical occupant safety fault requires immediate repair.

4
Cases Logged
5
Causes
Likely Causes — Seal U
  • 1Short circuit in the right curtain airbag module internal igniter (due to manufacturing defect or aging)
  • 2Damaged harness insulation causing a short to ground (harness inside the A-pillar, C-pillar, or roof side rail chafes and shorts to ground due to vibration or water ingress).
  • 3Connector short circuit (water ingress and corrosion at the SRSCM-to-wiring harness connector, or bent and deformed pins contacting each other)
  • 4Airbag Control Unit (ACU) internal detection circuit fault (false low resistance reading)
  • 5During vehicle modification or accident repairs, retaining clips crush or damage the wiring harness, causing a short circuit between the positive and negative wires.
What To Do
  • 1
    Safety preparation: Disconnect the battery negative terminal and wait at least 3 minutes to discharge the residual charge in the SRS system capacitors and prevent accidental deployment.
  • 2
    Visual inspection: Remove the right C-pillar trim panel and headliner edge. Check the curtain airbag wiring harness connector for looseness, water ingress, corrosion, or bent pins.
  • 3
    Resistance measurement: Disconnect the right curtain airbag connector. Measure the resistance between the curtain airbag module terminals using a multimeter (normal: 1.5-3.0 Ω). If the resistance is below 1.0 Ω, replace the curtain airbag module.
  • 4
    Wiring harness inspection: Measure the resistance between the wiring harness side and body ground (should be greater than 1 MΩ) to check for a short to ground. Measure continuity between both ends of the wiring harness to confirm no open circuit.
  • 5
    Wiring harness repair: If the wiring harness is damaged, repair the insulation or replace the wiring harness. Verify the rubber grommets at the A-pillar and C-pillar pass-through holes are intact and free from crushing or abrasion.
  • 6
    Module replacement: If the wiring harness is normal but the curtain airbag module resistance is abnormal, replace the right-side curtain airbag module (simultaneously replace or recalibrate the ACU, depending on vehicle configuration).
  • 7
    System reset: Connect all connectors, reconnect the battery, use the VDS2000 or Launch diagnostic tool to clear the fault code, and perform an SRS system self-diagnosis.
  • 8
    Function verification: Confirm the instrument panel SRS warning light turns off normally. Perform a road test or use a dedicated tool for a simulated resistance test to verify normal system operation.
Real-World Cases
BYD DTC AI Analysis

Qin EV450 SRS warning light on after driving through water in the rain

✓
A 2018 Qin EV450 showed a steady airbag warning light on the dash after wading through floodwater from heavy rain. Retrieved DTC B1713-00. Found obvious water inside the right C-pillar wiring harness connector; the pins had oxidised and blackened, causing a short between positive and negative. Removed the water from the connector, cleaned the pins with electronic contact cleaner, and applied conductive grease. Resistance returned to normal. Cleared the DTC and resolved the issue. The C-pillar weatherstrip had aged, allowing water to enter the connector cavity from the C-pillar during wading.
BYD DTC AI Analysis

Qin 100 abnormal curtain airbag resistance after accident repair

✓
2017 BYD Qin 100: After right-side collision repairs and replacement of the right curtain airbag, the vehicle set code B1713-00 at startup. Measured the new airbag module resistance with a multimeter: 0.8 Ω (abnormally low). Determined a batch defect or transport damage. Replaced with a brand new OEM curtain airbag module; resistance returned to 2.1 Ω, within normal range. Fault cause: aftermarket or defective part, or a wiring harness pinched during installation causing an internal short circuit.
BYD DTC AI Analysis

Qin EV300 headliner modification caused wiring harness wear.

✓
The owner reported the SRS warning light illuminated intermittently after the panoramic sunroof was tinted. Diagnosed as intermittent DTC B1713-00. Removing the headliner revealed a retaining clip had pinched the right curtain airbag wiring harness during the modification, damaging the insulation and causing an intermittent short to earth. Rerouted the harness, wrapped the damaged section with felt tape, and adjusted the clip positions to prevent interference. Cleared the fault codes and monitored for one week. No recurrence.
BYD DTC AI Analysis

ACU false positive causing abnormal resistance detection

✓
A 2017 Qin 80 with no accident history had an intermittent SRS warning light. The scan tool showed DTC B1713-00. On-site, the right curtain airbag resistance was 1.9Ω (normal) and the wiring harness had no short. Suspected an internal sampling circuit fault in the airbag control unit. Updated the ACU software to the latest version, but the fault persisted. Replaced the airbag control unit (ACU) and recoded it, completely eliminating the fault. This rare fault is a false alarm caused by drift in the control unit's hardware detection circuit.
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.