AU
B169000

DTC B169000 indicates the airbag control unit (SRS ECU) detects an abnormal configuration parameter in Loop 12 — Qin Plus

Safety System

DTC B169000 indicates the airbag control unit (SRS ECU) detects an abnormal configuration parameter in Loop 12.

In the BYD Qin PRO SRS system, "Loop 12" typically corresponds to the communication/ignition circuit for the left front seat side airbag (or seat occupancy recognition sensor). "Invalid configuration" means the configuration data stored in the ECU does not match the connected hardware.

Causes include circuit resistance outside the standard range (normal: 2.0-3.0 Ω), wiring open or short circuits, or failing to write the configuration after replacing the airbag assembly or control unit.

This fault may prevent the corresponding airbag from deploying properly during a collision or create an unintended deployment risk, classifying it as a functional safety fault.

The B169000 fault code on the Qin Plus indicates an invalid configuration in the left front seat side airbag circuit (Loop 12), where the SRS control unit data doesn't match the hardware. This medium severity issue commonly stems from worn wiring under the seat due to frequent adjustment, or lost configuration data after power loss. Repair requires visiting an authorised dealer. Typical repair cost data is available.
5
Cases Logged
5
Causes
Likely Causes — Qin Plus
  • 1Worn or broken wiring harness under the seat: Frequent seat adjustment on Qin PRO models repeatedly bends the yellow airbag wiring harness (circuit 12) under the seat frame. Over time, this breaks the internal copper wires or damages the insulation, causing abnormal resistance.
  • 2SRS control unit configuration data lost: Vehicle power loss (e.g., discharged battery or battery replacement) or a control unit software fault causes the stored circuit configuration parameters to fail verification.
  • 3Seat airbag assembly not programmed after replacement: After replacing the left front seat assembly or side airbag module, failure to perform the 'Airbag Configuration' function using VDS2000 prevents the ECU from recognizing the correct resistance configuration.
  • 4Poor connector contact: Water ingress, oxidation, or vibration causes increased pin contact resistance at the yellow airbag connector under the seat (usually at the front of the seat track).
  • 5Circuit fault caused by modification: Installing seat ventilation/heating or replacing with a non-OEM seat damaged the airbag wiring harness circuit integrity.
What To Do
  • 1
    Diagnostic scan: Use BYD VDS2000/VDS3000 to access the SRS system, read freeze frame data, and verify the Circuit 12 resistance value at the time of the fault (normal: 2.0-3.0Ω; >6Ω indicates open circuit; <1Ω indicates short circuit).
  • 2
    Locate the circuit 12 component: Refer to the Qin PRO workshop manual wiring diagram to confirm circuit 12 corresponds to the left front seat side airbag (or seat occupancy sensor on some models). Inspect the component for visible damage.
  • 3
    Check the seat wiring harness: Move the seat to the fully forward and fully rearward positions. Inspect the wiring harness inside the yellow corrugated conduit under the seat for wear. Specifically check if the harness retaining clip near the seat rail mounting point has detached and pinched the wiring harness.
  • 4
    Measure circuit resistance: Disconnect the negative battery terminal, wait 3 minutes, then disconnect the SRS ECU connector. Measure the resistance between the pins of circuit 12. The resistance must be 2.0-3.0 Ω. If abnormal, disconnect the connector under the seat and measure the circuit in sections to isolate the fault.
  • 5
    Check connector condition: Inspect the yellow airbag connector under the seat (usually equipped with a shorting bar). Verify terminals show no oxidation or pin back-out, and the connector lock is intact. If necessary, clean or replace the connector using the special tool.
  • 6
    Reconfigure the SRS: If the wiring is normal, use the diagnostic tool to execute the 'Airbag System Configuration' function and rewrite the vehicle VIN and airbag configuration code (obtain the vehicle's original configuration code from the BYD DMS system).
  • 7
    System verification: Clear the fault code, perform the SRS system self-check (turn ignition switch ON and wait for indicator to turn off), simulate a collision test (use a dedicated resistor in place of the airbag), and confirm the fault does not recur.
Real-World Cases
BYD DTC AI Analysis

Qin PRO DM seat adjustment causing wiring harness chafing

✓
A 2019 Qin PRO DM with 32,000 km had the airbag warning light on. Scan tool retrieved DTC B169000 - Loop 12 Invalid Configuration; freeze frame data showed 6.8Ω resistance (open circuit). Inspection found the yellow airbag harness under the front left seat rubbing against the seat rail during fore-aft adjustment, wearing through the insulation and fracturing the copper wires. Replaced the harness assembly (Part No.: CJ-6895123-XX), rerouted the wiring and added anti-chafe sleeving, and repositioned the harness clips to avoid contact with the rail. Fault resolved.
BYD DTC AI Analysis

Replaced the seat assembly but did not configure it

✓
2018 BYD Qin Pro (petrol). The airbag warning light came on after a repair shop replaced the left front seat leather. DTC B169000. Data stream showed Loop 12 resistance at 0.5 Ω (too low). Diagnosis found the side airbag had been removed during the seat leather replacement and reinstalled without performing configuration. The Qin Pro seat side airbag uses configurable resistance identification, so the airbag resistance did not match the vehicle’s stored configuration. Used VDS2000 to access ‘Special Functions - Airbag Configuration’, entered the original seat identification resistance code (located on the seat label), and completed configuration. The fault cleared.
BYD DTC AI Analysis

Water ingress caused the connector to oxidise

✓
A 2019 BYD Qin Pro DM came in with the airbag warning light on after rain. DTC B169000 was intermittent. Inspection of the airbag connector beneath the left front seat (yellow two-pin plug) revealed water marks and green corrosion on the terminals, causing erratic contact resistance (fluctuating between normal 2.3Ω and open circuit). Water entered the seat rail area when the vehicle was washed. The technician cleaned the connector pins with electronic cleaner, applied conductive grease, replaced the waterproof seal ring, and cleaned the seat drainage holes. After clearing the fault code, the fault did not recur at the one-week follow-up.
BYD DTC AI Analysis

SRS control unit software fault

✓
A batch of 2018 Qin PRO vehicles exhibited DTC B169000. The airbag warning light suddenly illuminated on several cars while driving, without prior accident repairs. Testing found normal Circuit 12 loop resistance (2.2Ω) on all vehicles, but the ECU continuously flagged a configuration error. Diagnosis: an SRS control unit (ACU) software bug in early production batches, causing false configuration error reports under specific temperature conditions. Upgrading the ACU software to version V3.2 (per BYD Technical Service Bulletin TSB-2019-SRS-03) resolved the issue; the fault did not recur.
BYD DTC AI Analysis

Aftermarket seat ventilation installation damaged the circuit

✓
A 2019 BYD Qin PRO. The airbag light came on the day after the owner had a seat ventilation system installed at an aftermarket shop. DTC B169000 set. Measured infinite resistance on circuit 12. Inspection found the installer accidentally severed the side airbag harness (circuit 12) while drilling into the seat foam. Repair: replaced the damaged harness section, re-soldered the connections and insulated them with double-layer heat shrink tubing, then restored the original harness routing. Do not drill, cut or modify anything within 5cm of airbag components.
Other Qin Plus 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.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.B110BDTC B110B indicates a fault in the internal air pump (sampling pump) of the PM2.5 air quality detector. This pump draws cabin or outside air into the PM2.5 sensor detection chamber, enabling the laser scattering sensor to measure real-time particulate matter concentration. The air conditioning controller (or BCM) sets this DTC upon detecting an open or short circuit in the pump drive circuit, or abnormal current caused by a seized pump motor. This fault disables the "Green Clean" system, causes the instrument cluster air quality display to read abnormally or disappear, and disables the automatic fresh air/recirculation switching function. It does not affect the vehicle powertrain or core thermal management functions.B173A1ADTC B173A1A indicates the right middle-row side airbag (typically located on the side of the right second-row seat or inside the C-pillar trim panel) igniter circuit resistance measures 0 Ω. In the Supplemental Restraint System (SRS), normal airbag igniter resistance ranges between 2.0 and 5.0 Ω. A resistance of 0 Ω indicates a short to ground or a short between circuit wires, preventing the Airbag Control Unit (ACU) from establishing a normal monitoring circuit. This safety-critical fault prevents the airbag from deploying during a collision, continuously illuminates the instrument panel SRS warning lamp, and may force the entire airbag system into fail-safe mode.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 Qin Plus →Qin Plus 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.