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B173712

DTC B173712 indicates a short to power in the firing circuit of the right second-row side airbag module in the Supplemental Restraint System (SRS) — Atto 3

Safety System

DTC B173712 indicates a short to power in the firing circuit of the right second-row side airbag module in the Supplemental Restraint System (SRS).

Specifically, the "right second-row side airbag" typically refers to the side impact airbag located in the right B-pillar or the side of the right seat.

The "12" suffix indicates a circuit short to battery positive (B+).

This fault causes the following conditions: 1) The airbag may fail to ignite and deploy during a collision, resulting in a loss of side impact protection. 2) In extreme cases, unintended triggering may cause accidental airbag deployment. 3) The SRS control unit detects abnormally high circuit voltage (typically above 4.5V) and enters fault protection mode.

This may disable the entire airbag system and continuously illuminate the instrument cluster airbag warning light.

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Cases Logged
Real-World Cases
BYD DTC AI Analysis

Chafed wiring loom on right-hand second-row side airbag caused a short circuit in Qin EV

✓
A 2019 BYD Qin EV with 85,000 km had the airbag warning light on steady. Scanning pulled DTC B173712. The technician found the wiring harness retaining clip below the right B-pillar had come loose, letting the harness chafe against the seat rail. The friction wore through the insulation, and the exposed copper wires shorted against the seat heater power line. Repair steps: fixed the damaged harness, re-secured the routing, and added anti-chafe sleeving. After clearing the code, the system returned to normal; resistance measured 2.4 Ω.
BYD DTC AI Analysis

BYD E2 seat side airbag connector corroded by water ingress

✓
The airbag warning light came on in a 2020 BYD E2 after wading through water. The diagnostic tool showed B173712. Inspection found obvious water stains and verdigris corrosion inside the yellow airbag connector under the right front seat, causing an insulation-failure short circuit between the ignition circuit terminal and the seat memory power terminal. Water entered beneath the seat from the carpet while wading. Fix: Thoroughly cleaned the connector, flushed it with electronic cleaner, dried it, and applied conductive grease. Because the pins were corroded and deformed, replaced the wiring harness connector with a new one, which resolved the fault.
BYD DTC AI Analysis

E3 passenger side airbag module internal short circuit replacement case

✓
2020 BYD E3 developed DTC B173712 following accident repairs. Repair history indicated a collision to the right side; the side airbag had not deployed but the module sustained impact. Measured the harness side of the airbag module connector and found no abnormal voltage. Disconnected the module and the short disappeared, confirming an internal squib short to power within the airbag module. Solution: Replaced the right middle-row side airbag module (part number must match the vehicle VIN), performed coding with the BYD dedicated diagnostic tool, ran the airbag system self-test procedure, and cleared the fault code. The fault did not return.
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: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.