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 — Qin Plus

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.

The B1713-00 fault code on the Qin Plus indicates low resistance in the right curtain airbag ignition circuit. This is a medium-severity safety issue that can stop the airbag deploying correctly or, rarely, cause unintended deployment. Common causes include a shorted curtain airbag igniter or damaged wiring in the pillar or roof area. Have the vehicle inspected and repaired by an authorised dealer immediately. Typical repair cost data is available from recorded cases.
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Cases Logged
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Causes
Likely Causes — Qin Plus
  • 1Short circuit in right curtain airbag module internal igniter (due to manufacturing defect or aging)
  • 2Damaged wiring harness insulation causing a short to ground (harness inside the A-pillar, C-pillar, or roof side rail chafes and grounds due to vibration or water ingress).
  • 3Connector short circuit (water ingress and corrosion at the SRSCM harness connector, or bent and deformed pins contacting each other)
  • 4Airbag Control Unit (ACU) internal detection circuit fault (false low resistance reading)
  • 5Retaining clips pinched or damaged the wiring harness during vehicle modification or accident repairs, causing a short circuit between the positive and negative wires.
What To Do
  • 1
    Safety preparation: Disconnect the 12V battery negative terminal and wait at least 3 minutes to discharge residual charge from the SRS system capacitor 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-side curtain airbag connector. Use a multimeter to measure the resistance between the curtain airbag module terminals (normal: 1.5-3.0 Ω). If the resistance is below 1.0 Ω, replace the curtain airbag module.
  • 4
    Wiring harness inspection: Measure resistance between the 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 harness. Ensure 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 curtain airbag module (replace or recalibrate the ACU simultaneously, depending on vehicle configuration).
  • 7
    System reset: Connect all connectors, reconnect the battery, use a VDS2000 or Launch diagnostic tool to clear the fault code, and perform an SRS system self-diagnosis.
  • 8
    Functional verification: Confirm the instrument cluster SRS warning light turns off normally. Perform a road test or use a special tool to conduct a simulated resistance test to verify the system has returned to normal.
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 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.