AU
B167100

The Right Side Impact Sensor is a key safety component of the Supplemental Restraint System (SRS) — Seal U

Safety System

The Right Side Impact Sensor is a key safety component of the Supplemental Restraint System (SRS).

The sensor typically mounts in the right B-pillar, right front door, or right C-pillar.

It monitors acceleration changes on the right side of the vehicle.

Upon detecting severe deceleration from a side impact, the sensor sends a crash signal to the SRS control unit to trigger the right side airbag and/or side curtain airbag deployment.

DTC B167100 indicates the SRS control module fails to receive a valid signal from the Right Side Impact Sensor, or the received signal falls out of range (including open circuit, short circuit, signal distortion, or no sensor response).

This fault disables the right side impact protection function.

The airbags may fail to deploy during a side collision.

The system illuminates the airbag warning light to alert the driver of a safety system fault.

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Cases Logged
5
Causes
Likely Causes — Seal U
  • 1Right side impact sensor internal damage or sensitivity drift (e.g., piezoelectric element aging or internal circuit fault)
  • 2Sensor wiring harness open circuit, short to ground, or short to power supply (commonly due to wiring harness chafing at the door hinge area or behind the B-pillar trim panel)
  • 3Poor contact at the sensor connector, oxidized pins, loose connections, or corrosion from water ingress (especially after wading or washing the vehicle).
  • 4Incorrect sensor mounting position, loose retaining bolts, or deformed bracket causing the sensor installation angle to exceed the calibrated range (±5°).
  • 5SRS control module (ACU) internal sampling circuit fault or loss of software calibration data
What To Do
  • 1
    Use the BYD dedicated diagnostic tool (VDS/VDS2000) to read the DTC freeze frame data, verify the environmental conditions when the fault occurred (vehicle speed, temperature, voltage), and clear the DTC to determine if the fault is intermittent.
  • 2
    Turn off the ignition, disconnect the battery negative terminal, and wait at least 90 seconds for the SRS capacitor to fully discharge. Inspect the right side impact sensor for physical damage, cracks, or water ingress.
  • 3
    Remove the right B-pillar lower trim panel or right front door trim panel (depending on vehicle configuration). Locate the impact sensor (usually marked 'Right Side Impact Sensor'). Check if the connector is fully seated and inspect the connector pins for oxidation, corrosion, or looseness.
  • 4
    Disconnect the sensor connector and use a multimeter to measure the sensor supply voltage (should be approximately 12 V), ground resistance (should be <1 Ω), and signal wire continuity. Measure the sensor resistance (typical reference value is 2.0–3.0 kΩ; refer to the workshop manual for exact specifications).
  • 5
    If the wiring harness is normal, replace the right side impact sensor (Note: distinguish between front and rear side impact sensors on some models). After replacement, verify the correct sensor installation direction (arrow pointing toward the front of the vehicle or following the marked direction) and tighten to the standard torque (usually 8-10 N·m).
  • 6
    Reconnect all wiring harnesses, restore the battery connection, and turn on the ignition. Use the diagnostic tool to perform the 'Crash Sensor Calibration' or 'SRS System Configuration' procedure (if applicable). Clear the fault codes and perform a road test to confirm the fault does not recur and the airbag warning light is off.
Real-World Cases
BYD DTC AI AnalysisFrom Chinese market (translated)

Side impact sensor mounting bracket deformation caused signal fault on Qin Pro DM

✓
Symptoms: Airbag warning light suddenly illuminated during normal driving with no collision history. Diagnosis: Connected a scan tool and retrieved DTCs B168000 (left side) and B167100 (right side). Inspected the impact sensors at the corresponding fender liners; found no visible damage. Measured sensor supply voltage at 12V (normal), ground (normal), and CAN line voltage (normal). Replaced the sensor but the fault persisted. Eventually discovered the sensor mounting bracket had deformed due to a previous improper accident repair, causing the sensor installation angle to shift and affecting signal detection. Resolution: Straightened the impact sensor mounting bracket, ensured the sensor installation angle met specifications (vertical deviation <5°), and retightened the fasteners. Fault resolved.
Original source ↗
BYD DTC AI AnalysisFrom Chinese market (translated)

BYD Dolphin B167100 Occupant Detection System Calibration Failure Case

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Symptom: After an OTA update, the front passenger seatbelt warning malfunctioned — it alerted when unoccupied but remained silent when occupied. DTC B167100 stored. Diagnosis: The dealership scan tool found DTC B167100 stored in the Body Control Module. The front passenger pressure sensor and capacitive sensor operated normally. The workshop manual identified this code as 'occupant detection system calibration data error'. Analysis indicated a data validation failure in the Body Control Module during the OTA update. Resolution: Used the VDS diagnostic tool to perform the 'occupant detection system recalibration' procedure, entering a standard weight of 75 kg for calibration learning. Cleared the fault code after completion, and the function returned to normal.
BYD DTC AI AnalysisFrom Chinese market (translated)

BYD Tang DM B16 Series Seatbelt Pretensioner Wiring Harness Poor Contact

✓
Symptoms: On starting the vehicle, the dashboard displayed "Check SRS System". The seatbelt warning light flashed and an intermittent buzzer alarm sounded. Read DTC B167000. Diagnosis: Connected a diagnostic tool to read the airbag system fault codes and found a B-pillar seatbelt pretensioner circuit fault. Removed the B-pillar trim to inspect the seatbelt pretensioner connector and found corrosion on the terminals. Measured pretensioner resistance: 2.8Ω (normal 2.0–3.0Ω). Resistance normal. Confirmed loose connector pins caused poor contact. Solution: Cleaned the seatbelt pretensioner connector, adjusted pin tension, applied conductive grease and reconnected the plug. Fault cleared.
BYD DTC AI AnalysisFrom Chinese market (translated)

BYD Song MAX: Replaced damaged Occupant Detection Sensor (ODS) unit

✓
Symptoms: Airbag warning light on instrument panel stays on. When a passenger occupies the front passenger seat, the airbag indicator does not change status. The front passenger airbag may fail to deploy correctly during a collision. B169000 series DTCs stored. Diagnosis: Scanned with VDS diagnostic tool and found B16 series DTCs. Checked the Occupant Detection Sensor (ODS) connector beneath the front passenger seat. Measured sensor resistance and found it outside specification (normal: 2.5-3.5kΩ, measured: 0.8kΩ). Inspected the wiring harness and found no shorts or open circuits. Determined internal sensor failure. Resolution: Replaced the front passenger seat Occupant Detection Sensor (ODS sensor). Recalibrated the occupant classification system. Cleared DTCs and tested normal.
Original source ↗
Other Seal U 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.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.B110AThis DTC indicates interrupted CAN bus communication or abnormal data between the air conditioning control unit (ACU) and the PM2.5 air quality sensor. The PM2.5 sensor monitors particulate concentration inside and outside the vehicle and provides the basis for purification control in the automatic air conditioning system. The ACU triggers this fault if it fails to receive a valid CAN message from the sensor within the specified period (usually 100-500 ms), if message verification fails, or if the signal frame times out. Although this fault does not affect vehicle driving safety, it disables the automatic air purification function. The air conditioning system cannot automatically switch between recirculation and fresh air modes or activate the air purification mode based on air quality. A persistent fault may restrict the thermal management strategy.
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. Sources: [1]