AU
B1750-00

This DTC indicates the SRS (Supplemental Restraint System) ECU cannot establish valid communication with the right rear side airbag module and detects an open circuit in the airbag circuit (resistance exceeds the normal 2-3Ω range, typically reading as infinite or >10Ω) — Atto 8

Safety System

This DTC indicates the SRS (Supplemental Restraint System) ECU cannot establish valid communication with the right rear side airbag module and detects an open circuit in the airbag circuit (resistance exceeds the normal 2-3Ω range, typically reading as infinite or >10Ω).

This failure disables protection for the right rear occupant during a side impact and may trigger an SRS downgrade mode, affecting the coordinated deployment strategy of other airbags.

On certain vehicle configurations, incorrect vehicle coding (flashing high-spec software to a low-spec vehicle) can cause a false DTC.

The B1750-00 fault code on the Atto 8 indicates the SRS ECU cannot properly communicate with the right rear side airbag and sees an open circuit. This is a medium-severity safety issue because that airbag may not protect the rear occupant in a side impact. Common causes include a loose or corroded airbag connector, or a faulty airbag module. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available from recorded cases.
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Cases Logged
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Causes
Likely Causes — Atto 8
  • 1Right rear seat side airbag connector loose or disconnected, or terminals oxidized (common after frequent seat adjustment or failing to reconnect after cleaning).
  • 2Airbag module internal open circuit or abnormal resistance (module aging, moisture ingress, or electrostatic damage)
  • 3Wiring harness open circuit or wear causing a short to ground or short to power (long-term bending and wear of the harness inside the seat slide rail, B-pillar, or sill trim panel).
  • 4Vehicle hardware configuration does not match software (low-spec model lacks this airbag, but SRS ECU is configured for high-spec version).
  • 5SRS ECU internal fault or software version defect (intermittent communication loss or false alarm)
What To Do
  • 1
    Safe power down: Turn the power switch to OFF, disconnect the negative battery terminal, and wait at least 90 seconds to fully discharge the SRS system capacitor and prevent accidental airbag deployment during repair.
  • 2
    Visual inspection: Remove the right rear seat and side trim panel, locate the airbag module connector (usually on the side of the seat backrest or below the B-pillar), and check for looseness, disconnection, water ingress, or terminal oxidation. Disconnect and reconnect the connector, and confirm the locking tab locks securely in place.
  • 3
    Circuit measurement: Disconnect the airbag module connector. Use a multimeter to measure the wiring harness terminal voltage to ground (should be <1V to rule out a short to power) and circuit continuity (resistance between the ECU and connector should be <2Ω). Measure the insulation resistance to ground (should be >10MΩ).
  • 4
    Replacement verification: Connect a known-good right rear side airbag module (or dedicated simulator), switch power to ON, use the diagnostic tool to clear the fault code, and wait 20 seconds to perform a self-test. If the fault code disappears, the original module has an internal fault.
  • 5
    Wiring harness repair: If the wiring harness has an open circuit, short circuit, or wear, repair the damaged wire (solder and insulate with heat-shrink tubing) or replace the wiring harness assembly. Add a protective sleeve at the seat slide rails and B-pillar to prevent recurring wear.
  • 6
    System reset: Restore all connections, reconnect the battery, perform SRS system configuration coding (if replacing the ECU or module), clear the fault codes, and perform a crash simulation test (using the diagnostic tool's active test function). Confirm the warning light turns off and the system has no fault codes.
Real-World Cases
BYD DTC AI Analysis

Qin EV450 right rear seat adjustment caused connector to come loose

✓
2018 BYD Qin EV450. Owner reported the airbag warning light stayed on after large forward/backward movements of the right rear seat. Scanned with VDS2000 and retrieved DTC B1750-00. Removed the right rear seat side trim panel and found the airbag module connector (beneath the seat backrest) not fully latched, causing it to come loose from seat track movement. Reconnected firmly, verified the latch engaged, then secured the harness with cable ties so it wouldn’t move with the seat. Cleared the fault code – issue resolved.
Original source ↗
BYD DTC AI Analysis

Qin 100: Internal open circuit in right rear side airbag module

✓
2017 BYD Qin 100. After collision repair to the right rear door and replacement of the door panel, DTC B1750-00 appeared and could not be cleared. Inspected connectors: connections normal. Measured airbag module resistance: infinite (normal: 2–3 Ω), determined an internal open circuit in the module (likely caused by static electricity or improper handling during repair). Replaced the right rear seat side airbag module, performed SRS system configuration and coding matching with the diagnostic scanner. Fault resolved.
Original source ↗
BYD DTC AI Analysis

Qin EV300 seat rail wear chafed through wiring harness, causing intermittent fault

✓
2017 BYD Qin EV300. SRS warning light illuminates intermittently. DTC B1750-00 sets intermittently. Rough roads easily trigger the fault. Found that at certain seat positions, the right rear seat rail pressed against and chafed the wiring harness, damaging the airbag circuit wire insulation and causing a short to earth. Repaired the damaged harness (rewrapped and fitted protective sleeving), rerouted the harness away from the seat rail movement range, and fitted a rubber sleeve at the interference point. Fault fully resolved.
BYD DTC AI Analysis

Incorrect software configuration on Qin 80 base model triggers false alarm.

✓
A 2017 BYD Qin 80 Comfort trim (no rear side airbags from factory) set DTC B1750-00 right after an SRS software update at the dealership. A configuration check revealed that the right rear side airbag was not physically installed; however, the SRS ECU had been incorrectly flashed with the high-spec software. The technician reflashed the ECU with the base model configuration codes using the dedicated diagnostic tool (VIN rematching and parameter configuration). The code cleared and 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.