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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.

4
Cases Logged
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
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.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.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.
Data confidence: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.