B16EA00 - B16EA00 B16EA00 Front Left Door Pressure Sensor Not Connected

Fault Definition

Fault Code B16EA00 indicates that the Vehicle Restraint System Control Unit (ACU) has detected a communication break or electrical open state in the signal circuit of the left front door pressure sensor. This sensor is a key sensing component for the side impact protection system, used to monitor the rate of pressure change within the door cavity in real time to determine collision intensity. When the control unit cannot receive a valid sensor impedance signal or identifies an open circuit in the wiring, the system judges the sensor as "disconnected", which directly affects the deployment strategy logic of the side and curtain airbags, causing the restraint system to be unable to execute protective actions according to preset algorithms under specific collision conditions.

Common Fault Symptoms

• The SRS Warning Lamp on the instrument panel remains illuminated, indicating system abnormalities.
• Partial functionality failure of the airbag system; side impact protection strategy may enter a disabled or degraded mode.
• When accessing the airbag system using a professional diagnostic tool, current or stored fault codes can be read.

Core Fault Cause Analysis

• Hardware Components: Piezoelectric elements or integrated circuits inside the left front pressure sensor are damaged, leading to inability to output valid physical signals.
• Wiring/Connectors: Open circuits, short circuits in the wiring harness between the sensor and the control unit, or connector pin corrosion/loosening causing abnormal contact resistance.
• Controller: Fault in the signal processing circuit inside the airbag controller, unable to power on correctly or parse sensor feedback data.

Technical Monitoring and Trigger Logic

• Monitoring Target: The control unit continuously monitors the electrical connection integrity and signal feedback validity of the left front pressure sensor.
• Trigger Condition: When the start switch is in the $ON$ position, the system enters the power-on self-check and operation monitoring stage.
• Judgment Logic: When the airbag controller receives a signal indicating the left front pressure sensor is disconnected (e.g., signal voltage out of normal communication range or infinite impedance), it immediately generates the fault code.