meaning the integrity of the airbag component cannot be confirmed. This typically means the system cannot ensure the side airbag will deploy normally according to design parameters during a collision event, belonging to a high-priority anomaly at the SRS system safety logic level.

Common Failure Symptoms

When the system records and stores the B16301B fault code, the feedback mechanisms in the cabin will initiate corresponding safety protection procedures:

• SRS Indicator Stays On: The "Airbag" or "SRS" warning light on the dashboard remains lit rather than extinguishing or flashing, indicating to the driver that the system is in a standby inactive state.
• Partial Functions Limited: The airbag system enters protection mode, and some actuator functions involving collision deployment are physically disabled or logically isolated.
• Passenger Information Panel Warnings: The vehicle may display text warnings related to airbags on the information entertainment system, informing passengers that the side airbag for their seat is unavailable.
• Abnormal Fault Light Status: After ignition switch cycling, dashboard indicator lights do not experience a normal self-check flash sequence before extinguishing, but instead remain lit continuously to indicate a permanent fault.

Core Failure Cause Analysis

Based on system logic architecture, the fundamental causes leading to the generation of B16301B can be divided into three dimensions: hardware components, physical connection paths, and control decision units:

• Hardware Component (Side Airbag Body) Fault Internal faults may occur within the side airbag component located in the first row on the right (driver outer side). This includes breakage of the squib (explosive charge), internal igniter short circuits, or damage to the airbag sensor probe itself, leading to the controller being unable to detect expected load signals.
• Wiring and Connectors (Physical Connection) Fault The main harness connecting the side airbag has physical damage or degraded electrical performance. Specifically表现为 open wire harness circuits, poor plug contact, pin withdrawal, corrosion oxidation, or short circuits within the wire harness to ground/power lines, making it impossible for the controller to obtain stable loop signals; the system judges this as "unconnected".
• Controller (Logic Operation) Fault Abnormalities occur in the diagnostic algorithms or storage circuits internal to the Airbag Control Module. When the controller cannot correctly calculate impedance values, or when erroneous state judgments regarding a specific airbag component are made at the software logic layer, the "unconnected" fault code may be falsely reported even if physical wiring is normal.

Technical Monitoring and Trigger Logic

The determination of this fault code is based on real-time scanning and comparison of loop characteristics by the Airbag Control Unit, with specific monitoring conditions as follows:

• Monitoring Target The system primarily monitors DC impedance values and voltage signal states of the side airbag (First Row Right) wiring. The controller continuously checks the resistance characteristics connected on the SRS diagnostic circuit to verify whether physical lines are conducting and whether components exhibit open circuit features.
• Numerical Range and Judgment Threshold The system performs logical operations based on preset reference impedance models. When monitored loop signals present extremely high impedance or open circuit characteristics (usually corresponding to $ \infty \Omega$ or open values exceeding the normal load range), the controller judges the component state as "unconnected". During the static self-check phase after ignition switch cycling, if the expected resistance range is not detected, the determination logic will be triggered.
• Specific Conditions Fault setting conditions are strictly limited to the system initialization stage after vehicle power-on and startup. When the airbag controller receives an unconnected signal input for the side airbag (Driver Outer Side), it immediately generates DTC B16301B based on preset fault level algorithms and writes it into non-volatile memory. This trigger logic does not rely on dynamic driving conditions but is mainly based on static verification

Cause Analysis Based on system logic architecture, the fundamental causes leading to the generation of B16301B can be divided into three dimensions: hardware components, physical connection paths, and control decision units:

• Hardware Component (Side Airbag Body) Fault Internal faults may occur within the side airbag component located in the first row on the right (driver outer side). This includes breakage of the squib (explosive charge), internal igniter short circuits, or damage to the airbag sensor probe itself, leading to the controller being unable to detect expected load signals.
• Wiring and Connectors (Physical Connection) Fault The main harness connecting the side airbag has physical damage or degraded electrical performance. Specifically表现为 open wire harness circuits, poor plug contact, pin withdrawal, corrosion oxidation, or short circuits within the wire harness to ground/power lines, making it impossible for the controller to obtain stable loop signals; the system judges this as "unconnected".
• Controller (Logic Operation) Fault Abnormalities occur in the diagnostic algorithms or storage circuits internal to the Airbag Control Module. When the controller cannot correctly calculate impedance values, or when erroneous state judgments regarding a specific airbag component are made at the software logic layer, the "unconnected" fault code may be falsely reported even if physical wiring is normal.

Technical Monitoring and Trigger Logic

The determination of this fault code is based on real-time scanning and comparison of loop characteristics by the Airbag Control Unit, with specific monitoring conditions as follows:

• Monitoring Target The system primarily monitors DC impedance values and voltage signal states of the side airbag (First Row Right) wiring. The controller continuously checks the resistance characteristics connected on the SRS diagnostic circuit to verify whether physical lines are conducting and whether components exhibit open circuit features.
• Numerical Range and Judgment Threshold The system performs logical operations based on preset reference impedance models. When monitored loop signals present extremely high impedance or open circuit characteristics (usually corresponding to $ \infty \Omega$ or open values exceeding the normal load range), the controller judges the component state as "unconnected". During the static self-check phase after ignition switch cycling, if the expected resistance range is not detected, the determination logic will be triggered.
• Specific Conditions Fault setting conditions are strictly limited to the system initialization stage after vehicle power-on and startup. When the airbag controller receives an unconnected signal input for the side airbag (Driver Outer Side), it immediately generates DTC B16301B based on preset fault level algorithms and writes it into non-volatile memory. This trigger logic does not rely on dynamic driving conditions but is mainly based on static verification