B167011 - B167011 Right Side Collision Sensor Short to Ground

B167011 Fault Depth Definition

B167011 (Right Side Impact Sensor Shorted to Ground) is a critical Diagnostic Trouble Code (DTC) recorded in the Airbag Control System, directly reflecting abnormal states of the vehicle's passive safety system internal signal circuits. In the system architecture, this fault code corresponds to an altered electrical connection relationship between the collision sensor located at a critical load-bearing point of the body structure—the right B-pillar—and the chassis ground.

Analyzing from a control logic perspective, when the Airbag Control Unit (ACU) performs self-diagnosis, it monitors the signal status of the right B-pillar side impact sensor. Under normal conditions, the sensor is in a specific high-impedance or preset voltage interval; when the module detects an abnormal low-impedance path on the sensor circuit, i.e., physically directly connected to ground (Ground), it determines a "short to ground". This logic triggers the controller's protection mechanism, resulting in partial failure of airbag functions. The generation of this fault code marks that the system cannot confirm the true signal output of the collision sensor, thereby locking the functional permissions of related drivers or actuator modules at the system level, belonging to a typical electrical integrity verification failure.

B167011 Common Fault Symptoms

When DTC B167011 is written into the controller's non-volatile memory, the airbag system on the user side enters a restricted work mode, specific driving experience and instrument feedback performance are as follows:

• SRS Warning Light On or Blinking: The Airbag warning light (SRS) on the instrument panel remains illuminated, indicating that the system self-test found a fault.
• Function Failure Indicator: Vehicle diagnostic information displays that part of the airbag system has failed, indicating collision recording and trigger logic cannot run normally.
• Collision Data Recording Interruption: When a collision event occurs, the signal from the right-side impact sensor cannot be correctly collected, which may lead to delayed or inaccurate airbag deployment determination.
• Maintenance Mode Limitations: When performing relevant system maintenance or insurance claim detection, scanning tools will directly read this fault code, cannot clear without specific operations.

B167011 Core Fault Cause Analysis

According to fault code generation mechanism and electrical principles, the phenomenon of the right B-pillar side impact sensor appearing shorted to ground mainly stems from failures in the following three technical dimensions:

• Hardware Components (Right Side Impact Sensor): Internal electronic components or signal output ends of the sensor suffer physical damage, leading to loss of insulation performance between output pins and the ground layer, forming a direct conduction.
• Wiring/Connectors (Harness or Connector): The harness connecting the right B-pillar side impact sensor has wear, aging, or is compressed/deformed, causing copper wire contact with the vehicle chassis; meanwhile, metal terminals inside connectors may fracture/displace or corrode, creating a short-to-ground path.
• Controller (Airbag Controller Fault): Circuit damage to the signal input port inside the control unit, potentially misjudging sensor status or directly shorting internally to ground, thereby producing incorrect fault judgment signals.

Technical Monitoring and Trigger Logic

The generation of B167011 fault code follows strict electrical monitoring standards and time threshold logic, specific trigger mechanism as follows:

• Monitoring Target: The Airbag Controller continuously monitors the voltage level of the right B-pillar side impact sensor and its ground resistance value.
• Fault Set Condition: When the system detects a short to ground on the right B-pillar side impact sensor signal line, it meets the set fault judgment threshold. This means signal voltage is pulled down to near chassis ground potential ($0V$) or impedance is below the system's minimum allowable threshold.
• Trigger Fault Condition: When the Airbag Controller receives confirmed short-to-ground signals from the right B-pillar side impact sensor, after verifying through a preset time window, the controller performs logic operations to confirm this abnormality is not a sporadic pulse signal, then generates and stores fault code B167011. This process ensures that only exact electrical anomalies occurring under dynamic conditions or specific self-check moments (such as start-up self-check) are recorded as permanent or temporary fault codes.