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) — Seal 6 EV

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 Seal 6 EV indicates the SRS ECU cannot communicate properly with the right rear side airbag module and detects an open circuit. Severity is medium because right rear side-impact protection may be disabled. Common causes include a loose/disconnected airbag connector, oxidized terminals, or an internal airbag module fault. 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 — Seal 6 EV
  • 1Loose or disconnected right rear seat side airbag connector, or oxidized terminals (common after frequent seat fore-and-aft adjustment or failure to reconnect after cleaning)
  • 2Airbag module internal open circuit or abnormal resistance (module aging, moisture, or electrostatic damage)
  • 3Wiring harness open circuit, or wear causing a short to ground or 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 uses the high-spec configuration).
  • 5Internal SRS ECU fault or software version defect (intermittent communication interruption or false alarm)
What To Do
  • 1
    Safe power-down: Turn the power switch to OFF, disconnect the battery negative terminal, and wait at least 90 seconds to fully discharge the SRS system capacitors 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 is fully engaged.
  • 3
    Circuit measurement: Disconnect the airbag module connector. Use a multimeter to measure the harness terminal voltage to ground (must be <1V to rule out short to power) and circuit continuity (resistance between the ECU and connector must be <2Ω). Measure the insulation resistance to ground (must be >10MΩ).
  • 4
    Replacement verification: Connect a known-good right rear side airbag module (or dedicated simulator), restore power to the ON position, 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 protective sleeving at the seat slide rails and B-pillar to prevent recurring wear.
  • 6
    System reset: Restore all connections and reconnect the battery. Perform SRS system configuration coding (if replacing the ECU or module). Clear fault codes and perform a crash simulation test (using the diagnostic tool 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 Seal 6 EV 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.B1737DTC B1737 indicates the Supplemental Restraint System (SRS) detected abnormal continuity between the right middle-row side airbag squib circuit (typically the second-row right seat side airbag or right curtain airbag) and the vehicle power supply (B+, battery positive). The SRS ECU monitors the airbag inflator resistance via an internal current source (normal resistance: 2.0–3.0 Ω). If the ECU detects the voltage across the inflator circuit remaining close to battery voltage (>5 V and approaching 12 V) instead of the expected low potential or floating state, it identifies a short to power. This fault prevents the airbag from deploying normally during a collision because the short circuit bypasses the firing current. In extreme cases, abnormal current can cause unintended deployment, posing a severe safety hazard.B173BDTC B173B indicates an abnormal electric A/C compressor speed feedback signal or a communication fault between the compressor controller and the motor. In BYD new energy models (e.g., Tang, Song, Qin, and Yuan series), this DTC belongs to the HVAC subsystem within the Body Control system and specifically involves the electric compressor closed-loop control circuit. The ECU sets this DTC when the compressor controller (IPM) fails to receive a valid pulse signal from the Hall speed sensor for more than 3 continuous seconds, or when the deviation between the detected actual speed and the target commanded speed exceeds the calibrated threshold (typically >500 rpm). This fault forces the A/C system into fail-safe mode and stops compressor operation. Symptoms include a complete lack of cooling, intermittent cooling, or a sharp decrease in cooling performance. The instrument cluster A/C warning lamp may also illuminate. Prolonged operation with this fault can degrade high-voltage system insulation or cause controller overcurrent damage.
Common problems reported for Seal 6 EV →Seal 6 EV 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.