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 — Atto 8

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 Atto 8 indicates the SRS airbag control unit has detected low resistance in the right curtain shield airbag ignition circuit. This is a medium-severity safety issue that may stop the airbag deploying correctly or increase unintended deployment risk. Common causes include a shorted curtain airbag igniter or damaged pillar/roof wiring. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available.
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Cases Logged
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Causes
Likely Causes — Atto 8
  • 1Right curtain airbag module internal igniter short circuit (due to manufacturing defect or aging)
  • 2Harness insulation damaged, causing a short to ground (harness in the A-pillar, C-pillar, or roof side rail chafes to ground due to vibration or water ingress).
  • 3Connector short circuit (water ingress and corrosion at the SRSCM and wiring harness connector, or bent and deformed pins contacting each other)
  • 4Airbag Control Unit (ACU) internal detection circuit fault (false low resistance reading)
  • 5A retaining clip pinched or damaged the wiring harness during vehicle modification or accident repair, causing a short circuit between the positive and negative wires.
What To Do
  • 1
    Safety preparation: Disconnect the negative battery 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 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. 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 curtain airbag module resistance is abnormal, replace the right curtain airbag module (simultaneously replace or recalibrate the ACU, depending on vehicle configuration).
  • 7
    System reset: Connect all connectors, reconnect the battery, use a VDS2000 or Launch diagnostic tool to clear fault codes, and perform an SRS system self-diagnosis.
  • 8
    Function check: Confirm the instrument cluster SRS warning light turns off normally. Conduct a road test or use a special tool to perform 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 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.