AU
B1713

DTC B1713 indicates the right curtain airbag igniter circuit resistance falls below the normal threshold set by the SRS control unit (typically 2 — Atto 3

Safety System

DTC B1713 indicates the right curtain airbag igniter circuit resistance falls below the normal threshold set by the SRS control unit (typically 2.0-5.0Ω).

Low resistance (<2Ω or close to 0Ω) indicates a short circuit risk in the igniter circuit.

Potential causes include an internal short circuit in the curtain airbag, a wiring harness short to ground, or an abnormal internal driver circuit in the SRS ECU.

This fault forces the SRS system into fail-safe mode.

During a collision, the right curtain airbag may fail to deploy, or it may deploy unintentionally.

This constitutes a high-level safety fault.

4
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Internal short circuit in the right curtain airbag igniter: Aging, moisture ingress, or manufacturing defects degrade insulation between the two terminals of the ignition squib, dropping resistance below 2 Ω.
  • 2Wiring harness short to ground: Wear on the A-pillar, B-pillar, or roof wiring harness during accident repairs, modifications, or long-term use causes the igniter circuit to short to body ground.
  • 3Connector terminal short circuit: Water ingress, oxidation, or improper connection causes a short circuit between terminals in the right curtain airbag connector (usually located near the roof side rail or C-pillar).
  • 4Internal fault in the SRS control unit: Breakdown of curtain airbag drive circuit components inside the ACU (Airbag Control Unit) causes abnormal detected resistance.
  • 5Improper repair procedures: During headliner or side trim panel removal, tools crush the wiring harness and damage the insulation, or metal clips pierce the wiring harness and cause a short circuit.
What To Do
  • 1
    Use VDS or a dedicated diagnostic tool to read the fault code, confirm B1713 is a current fault (Active) rather than a history fault, and record the freeze frame data.
  • 2
    Perform the safe power-down procedure: turn off the ignition switch, disconnect the battery negative terminal, and wait at least 90 seconds to fully discharge the SRS capacitor and prevent accidental airbag deployment.
  • 3
    Remove the right A-pillar and B-pillar trim panels and the rear section of the headliner to expose the right curtain airbag assembly and the yellow SRS connector (usually marked R-Curtain or R-SAB).
  • 4
    Visually inspect the wiring harness: check the yellow corrugated conduit for damage or burn marks, and check the connector for water ingress, corrosion, or bent pins.
  • 5
    Disconnect the right curtain airbag connector. Use a multimeter to measure the resistance between the terminals on the curtain airbag side. Normal resistance is 2.0-5.0 Ω. If the resistance is <2 Ω, replace the curtain airbag assembly. Measure the insulation resistance to ground on the wiring harness side. The resistance must be >1 MΩ; otherwise, repair the wiring harness.
  • 6
    If the curtain airbag resistance is normal, check the wiring harness continuity from the SRS ECU to the curtain airbag: use a multimeter to measure the resistance between the corresponding ECU connector pin and the curtain airbag connector. Resistance must be <1Ω. Measure the insulation to ground and power supply.
  • 7
    Jumper verification: Connect a 2-3Ω simulator resistor to the wiring harness in place of the curtain airbag. Restore power and read the fault code. If the fault clears, the curtain airbag is faulty. If the fault remains, check the ECU.
  • 8
    Replace the faulty component (curtain airbag, wiring harness, or SRS ECU), reconnect all connectors, and fully engage the yellow locking tab.
  • 9
    Connect the battery, turn the ignition switch to the ON position, and clear the fault code using the diagnostic tool. Perform the SRS system self-check (usually takes 10-30 seconds). Verify B1713 does not reappear and the airbag warning light turns off.
  • 10
    Perform a road test. If necessary, use the diagnostic tool to read the live data stream and confirm the right-side curtain airbag resistance is within the normal range.
Real-World Cases
BYD DTC AI Analysis

BYD Tang DM right side curtain airbag connector shorted due to water ingress

✓
A 2021 Tang DM triggered DTC B1713 after driving through floodwater during heavy rain. Disassembly revealed the right-side C-pillar curtain airbag connector seal had deteriorated, allowing rainwater to seep in and short the terminals. Resistance measured only 0.8Ω. Cleaned the connector with electronic cleaner, replaced the seal, and applied conductive anti-corrosion compound. Fault resolved.
BYD DTC AI Analysis

Song MAX: Pinched wiring harness after accident repair caused low resistance.

✓
After a right-side collision repair, a 2019 Song MAX set DTC B1713. Inspection found the technician hadn't routed the curtain airbag harness correctly when reinstalling the headliner. The headliner's metal clips pinched and damaged the harness, causing a short to earth. Repair: repaired the harness (3 wires with damaged insulation), re-routed it, and fitted protective sleeving. Fault cleared.
BYD DTC AI Analysis

BYD Yuan EV – Curtain Airbag Igniter Internal Fault Replacement Case

✓
A Yuan EV535 developed intermittent DTC B1713 after 40,000 km. The fault came and went. After disconnecting power, measured the right curtain airbag resistance; it fluctuated between 1.2 and 2.5 ohms (spec: 2.3±0.3 ohms). Determined that an ageing internal igniter in the curtain airbag was causing the unstable resistance. Replaced the right curtain airbag assembly (part number...), performed programming and matching, and the fault has not recurred.
BYD DTC AI Analysis

Qin Pro SRS ECU internal driver circuit fault

✓
2020 Qin Pro repeatedly logged DTC B1713. Replacing the right side curtain airbag and wiring harness did not fix the fault. Checked the ECU output waveform with an oscilloscope and found it abnormal. Diagnosis: component breakdown in the right curtain airbag drive circuit inside the SRS control unit. Repair: replaced the SRS control unit (VIN and configuration parameters must be updated at the same time). After online matching, the system returned to normal.
Other Atto 3 Fault Codes
P0A0DBattery Energy Control Module Requested MIL IlluminationP0AA6Hybrid Battery Voltage System Isolation FaultP1A00Drive Motor "A" Performance — BYD proprietaryB1108For 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.
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.