NO
AU
B1752-00

DTC B1752-00 indicates the right rear side airbag igniter circuit is shorted to vehicle power (B+) — Atto 3

Safety System

DTC B1752-00 indicates the right rear side airbag igniter circuit is shorted to vehicle power (B+).

In the SRS (Supplemental Restraint System) circuit architecture, the airbag igniter is a low-impedance (nominal 2-5Ω) resistance wire.

Normally, the SRS control unit uses an internal boost circuit to supply a momentary high current (approx. 1-3A) to deploy the airbag during a collision.

Detecting a short to the 12V power supply in the igniter harness indicates an abnormal high-potential path in the circuit.

This creates two risks: first, continuous power supply may cause accidental airbag deployment without a collision (although modern SRS controllers typically feature short-circuit protection); second, during an actual collision, the external power short prevents the control unit from forming an effective current loop to deploy the airbag, disabling the safety function.

Consequently, the SRS control unit immediately illuminates the airbag warning lamp, stores this DTC, disables the right rear side airbag and related linked protection functions, and enters fail-safe mode.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

Frequent folding of the right rear seat caused the wiring harness to wear through and short circuit.

✓
A 2018 BYD Qin EV450 with 80,000 km showed an airbag warning light on the dash. VDS pulled fault code B1752-00. The owner said they often used the car for hauling cargo, keeping the right rear seat folded down for long periods. Removing the seat revealed the side airbag wiring harness insulation had completely worn through at the seat frame hinge, exposing copper wire that shorted against the seat heater pad power line. Repair: replaced the damaged wiring section, fitted abrasion-resistant corrugated tubing, re-routed the harness, and added retaining clips to prevent flexing during seat movement. Fault resolved.
BYD DTC AI Analysis

C-pillar water leak caused airbag connector corrosion and short circuit

✓
2017 Qin 100 airbag warning light remained on after heavy rain, with DTC B1752-00. Found water inside the right rear C-pillar trim. The rear sunroof drain hose connector had deteriorated and detached, allowing rainwater to run down the C-pillar. The right rear side airbag connector (yellow) below the C-pillar had corroded from water ingress; oxide layers and electrolyte on the terminals caused a short to power. Repair: Unclogged and replaced the sunroof drain hose, removed water from the C-pillar, thoroughly cleaned the connector with electrical contact cleaner and applied conductive grease, blow-dried and left for 24 hours, then reinstalled and road tested. Fault resolved.
BYD DTC AI Analysis

Airbag module internal short circuit false alarm.

✓
No collision history. DTC B1752-00 sets intermittently and returns days after clearing. Disconnected the airbag module connector and measured the harness side – voltage <0.1V, resistance to ground >10MΩ. Substituted a 2.5Ω resistor for the airbag module to simulate the load and monitored continuously for one week without fault recurrence. Found insulation deterioration on the igniter resistor wire inside the right rear side airbag module, causing an internal short to the capacitor terminal. Replaced with a genuine airbag module (part number matches VIN), performed SRS configuration, and resolved the fault completely.
BYD DTC AI Analysis

Seat removal and refitting pinched the wiring harness, causing a short circuit.

✓
The vehicle developed DTC B1752-00 the day after an unauthorised repair shop replaced the right rear seat leather cover. Inspection at the dealership revealed that during seat installation, the technician had failed to properly clip the airbag wiring harness into the retention slot on the seat frame. The seat rails pinched the harness, and the metal edge cut the insulation during electric seat adjustment, causing a short to the seat motor power supply wire. Repair procedure: Rerouted the harness into the dedicated wiring channel, wrapped the damaged section with felt tape (copper core unaffected), fitted abrasion-resistant sleeving, and reinstalled the retaining clips. Cleared the fault code and verified normal operation through multiple seat adjustment cycles. Fault resolved.
BYD DTC AI Analysis

SRS control unit internal driver circuit fault

✓
After ruling out the wiring harness and airbag module, the fault remained. I measured a constant 12V at the SRS ECU drive terminal for the right rear side airbag (normally 0V; it should supply voltage only upon crash trigger). I removed the SRS control unit (under the centre console) and found the power MOSFET in the internal ignition drive circuit had short‑circuited, sending constant voltage to the igniter circuit. Since the control unit is a safety component and cannot be serviced separately, I replaced the SRS control unit assembly, carried out online coding (entering the vehicle VIN and configuration code), and calibrated the collision sensors to clear the fault.
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.