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 8

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.

The B1713 fault code on the Atto 8 indicates low resistance in the right curtain airbag igniter circuit, creating a short circuit risk. This is a medium-severity safety fault that can put the SRS system into fail-safe mode and affect airbag deployment. Common causes include a shorted curtain airbag igniter or damaged roof/A-pillar wiring. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available from recorded cases.
4
Cases Logged
5
Causes
Likely Causes — Atto 8
  • 1Internal short circuit in the right curtain airbag igniter: Aging, moisture ingress, or manufacturing defects in the squib reduce insulation between the terminals, dropping resistance below 2Ω.
  • 2Wiring harness short to ground: A-pillar, B-pillar, or roof wiring harness worn from accident repairs, modifications, or long-term use, causing the igniter circuit to short to body ground.
  • 3Connector terminal short circuit: Water ingress, oxidation, or improper connection causes a short circuit between terminals at the right curtain airbag connector (usually located near the roof side rail or C-pillar).
  • 4SRS control unit internal fault: Component breakdown in the curtain airbag drive circuit inside the ACU (Airbag Control Unit) causes abnormal resistance detection.
  • 5Improper repair procedures: When removing the headliner or side trim panels, tools pinch the wiring harness, damaging the insulation, or metal clips puncture the wiring harness, causing a short circuit.
What To Do
  • 1
    Use VDS or a dedicated diagnostic tool to read the fault code, verify B1713 is a current (Active) fault rather than a history fault, and record the freeze frame data.
  • 2
    Perform the safe power-down procedure: Turn off the ignition, disconnect the negative battery terminal, and wait at least 90 seconds to fully discharge the SRS capacitor and prevent accidental airbag deployment.
  • 3
    Remove the right A-pillar trim, B-pillar trim, and 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 2.0-5.0Ω. If <2Ω, replace the curtain airbag assembly. Measure the insulation resistance to ground on the wiring harness side. The resistance must be >1MΩ. Otherwise, repair the wiring harness.
  • 6
    If the curtain airbag unit 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. The resistance must be <1Ω. Measure the insulation to ground and power supply.
  • 7
    Jumper test: 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 ensure the yellow locking tab fully engages.
  • 9
    Connect the battery and turn the ignition switch to the ON position. Clear the fault code using the diagnostic tool. Perform the SRS system self-check (wait 10-30 seconds). Verify B1713 does not return 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 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 8 Fault Codes
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.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.B110B07This fault code indicates abnormal operation of the internal air pump (sampling pump) in the PM2.5 air quality detection module. The PM2.5 detector uses the laser scattering principle to measure particulate concentration and requires a built-in air pump to draw ambient air into the detection chamber at a constant flow rate. The ECU sets this code when it detects an open or short in the air pump drive circuit, abnormal current (stall or free-running), or abnormal speed feedback. This fault causes the automatic air conditioning system to lose air quality sensing capability, preventing automatic switching between fresh air and recirculation modes. The instrument cluster air quality display may show '--' or a fixed value, but the fault does not affect the vehicle powertrain or basic air conditioning cooling and heating functions.B173CDTC B173C indicates the Supplemental Restraint System (SRS) detects the Right Second Row Side Airbag squib circuit resistance exceeds the calibrated threshold (typically >4.5Ω). This fault is an active diagnostic result of the SRS system, indicating a high-resistance condition in the circuit between the Airbag Control Unit (ACU) and the airbag module. Causes for excessive resistance include increased contact resistance, a partially broken wiring harness, terminal oxidation, or an aging squib wire inside the airbag module. This fault causes the system to mark the airbag circuit as 'unreliable', meaning the airbag may fail to deploy during a collision. The fault typically illuminates the instrument cluster airbag warning light (SRS light) continuously, and some models also sound a warning buzzer.
Common problems reported for Atto 8 →Atto 8 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.