B224913 - B224913 Right Rear Window Motor Open Circuit

meaning unable to operate the rear right window glass using door switches.

• One-way or Full Lock-up Phenomena: Although some windows support emergency manual mode, there may be complete lack of response in electric mode, or abnormal sticking sensations at specific positions (if intermittent open circuit).
• Instrument Fault Indicator Prompt: The vehicle information interaction system or dashboard may display window system warning messages in relevant settings menus.
• System Protection State Activation: Upon detecting anomalies, the domain controller may enter a fail-safe mode, prohibiting continued output of driving power to the motor to prevent current surges from damaging internal controller circuits.

Core Fault Cause Analysis

Based on the fault code definition and monitoring logic, the root causes leading to this open circuit fault can be categorized into three hardware and logic dimensions:

• Wiring Harness or Connector Failure: This is the most common physical cause in external electrical links. Includes power supply wires or grounding wires from R Domain Controller to the rear right window motor that are broken, pins pulled back, oxidized/corroded, or internal connector terminals with poor contact due to vibration. Any physical damage interrupting the current path will trigger this code.
• Rear Right Window Motor Failure: Open circuit (Open Coil) in internal electromagnetic coils or connection failure caused by brush wear. At this time, motor windings no longer have the capacity to carry working current, but supply line voltage may still exist normally, leading the control unit to judge it as an open circuit.
• R Domain Controller Failure: As the core for logic operation and power management, damage to internal drive circuits (e.g., MOSFETs, power transistors) or failure of internal current detection sampling resistors. If the controller cannot correctly perceive actual current values flowing through the motor and reports zero, even with normal external lines and motor, the system will judge it as an open circuit state.

Technical Monitoring and Trigger Logic

The generation of this fault code follows strict software logic determination algorithms, centered on continuous monitoring of load current. Specific monitoring mechanisms are as follows:

• Setup Fault Condition: Monitoring only starts when the actuator is activated. Specific condition: Driving the window motor action. At this time, the R Domain Controller applies voltage to the motor power supply terminal and attempts to drive the load. The system does not report errors immediately during this period but continues to wait for current feedback signals.
• Trigger Fault Condition: Diagnostic logic activates under the premise of basic system power, specifically: Ignition switch in ON position. The vehicle must be powered on to activate domain controller monitoring functions. In this state, once the motor is driven, if current sensors or ADC (Analog-to-Digital Converter) sampled values remain continuously below the set threshold (i.e., no current detected), and persists beyond the preset time window, the system will confirm that an open circuit event has occurred.
• Signal Judgment Criteria Explanation: Monitoring targets instantaneous working current flowing through the motor. Theoretically, specific load current characteristic values should exist when the motor runs; if the control unit detects current close to zero or below fault determination threshold (i.e., no current return), and excludes the controller's own output off state, an open circuit fault is confirmed. This logic aims to distinguish "not driven" from "unable to drive", thus precisely locating the issue to the actuator or wiring level.

Cause Analysis Based on the fault code definition and monitoring logic, the root causes leading to this open circuit fault can be categorized into three hardware and logic dimensions:

• Wiring Harness or Connector Failure: This is the most common physical cause in external electrical links. Includes power supply wires or grounding wires from R Domain Controller to the rear right window motor that are broken, pins pulled back, oxidized/corroded, or internal connector terminals with poor contact due to vibration. Any physical damage interrupting the current path will trigger this code.
• Rear Right Window Motor Failure: Open circuit (Open Coil) in internal electromagnetic coils or connection failure caused by brush wear. At this time, motor windings no longer have the capacity to carry working current, but supply line voltage may still exist normally, leading the control unit to judge it as an open circuit.
• R Domain Controller Failure: As the core for logic operation and power management, damage to internal drive circuits (e.g., MOSFETs, power transistors) or failure of internal current detection sampling resistors. If the controller cannot correctly perceive actual current values flowing through the motor and reports zero, even with normal external lines and motor, the system will judge it as an open circuit state.

Technical Monitoring and Trigger Logic

The generation of this fault code follows strict software logic determination algorithms, centered on continuous monitoring of load current. Specific monitoring mechanisms are as follows:

• Setup Fault Condition: Monitoring only starts when the actuator is activated. Specific condition: Driving the window motor action. At this time, the R Domain Controller applies voltage to the motor power supply terminal and attempts to drive the load. The system does not report errors immediately during this period but continues to wait for current feedback signals.
• Trigger Fault Condition: Diagnostic logic activates under the premise of basic system power, specifically: Ignition switch in ON position. The vehicle must be powered on to activate domain controller monitoring functions. In this state, once the motor is driven, if current sensors or ADC (Analog-to-Digital Converter) sampled values remain continuously below the set threshold (i.e., no current detected), and persists beyond the preset time window, the system will confirm that an open circuit event has occurred.
• Signal Judgment Criteria Explanation: Monitoring targets instantaneous working current flowing through the motor. Theoretically, specific load current characteristic values should exist when the motor runs; if the control unit detects current close to zero or below fault determination threshold (i.e., no current return), and excludes the controller's own output off state, an open circuit fault is confirmed. This logic aims to distinguish "not driven" from "unable to drive", thus precisely locating the issue to the actuator or wiring level.