B222613 - B222613 Left Rear Window Motor Open Circuit

Fault Definition Details

Fault code B222613 is defined as a left rear window motor open circuit, this code in vehicle domain controller architecture represents load side electrical integrity validation failure. Specifically, when left domain controller executes drive commands, it monitors downstream actuator current loop status through internal power devices. When system cannot sense expected motor current signal, determines physical interruption or high-impedance state on electrical path, i.e., "open circuit". This definition emphasizes controller's reliance on load-end feedback, indicating unexpected open-circuit fault occurred in energy transmission link between motor and controller, belongs to typical electrical load monitoring anomalies.

Common Fault Symptoms

Based on original description of left rear window motor function failure, specific phenomena can be manifested at actual driving experience and system feedback level as follows:

• Left rear side window glass cannot respond to switch commands for lifting/lowering movement, remains stationary.
• Operating requests sent by driver or passenger via interior control module are rejected, no mechanical action output.
• Body domain related indicator lights on instrument panel or door trim panel may light up abnormal prompts (if applicable).

Core Fault Cause Analysis

According to original diagnostic data, hardware and logic factors leading to this fault code generation can be categorized into following three dimensions:

• Wiring and Connector Faults: Including harness physical wear breakage, connector terminal corrosion loose or excessive contact resistance, causing current transmission interruption.
• Left Rear Window Motor Fault: Motor internal stator coil open circuit, rectifier bridge damage or mechanical jamming caused back EMF abnormality, preventing load end from forming closed-loop current.
• Left Domain Controller Fault: Controller internal drive circuit (e.g., power transistor) open circuit damage, or current sampling line anomaly, causing unable to correctly output or monitor current signals.

Technical Monitoring and Trigger Logic

This fault code determination strictly based on specific system operating conditions and electrical parameter monitoring results:

• Monitoring Target: Real-time acquisition of instantaneous current values in motor current loop, verifying effective load feedback existence.
• Specific Operating Conditions: Dynamic monitoring performed only during driving left rear window motor action, no open-circuit determination under static standby state.
• Fault Trigger Timing: When start switch placed ON gear, system enters working mode, begin actuator activation test.
• Judgment Threshold Logic: During drive command output, if control unit detects no current detected (i.e., sampling value below effective threshold), system will immediately lock fault condition and record B222613 code.