C101000 Right Rear Wheel Monitor Module Battery Voltage Low Fault Technical Explanation

Fault Condition Definition

DTC: C101000 (Right Rear Wheel Monitor Module Battery Voltage Low) represents an anomaly in the power supply system of the Right Rear Wheel Monitor Module within the vehicle's electronic architecture. In the on-board network topology, this module acts as a critical node in the perception layer, responsible for collecting physical motion parameters of the wheels in real time and constructing data feedback loops. This DTC indicates that its internal power management system has detected battery voltage falling below a pre-defined safety threshold, causing the module to be unable to maintain normal communication protocols or computational logic.

The system typically establishes connectivity with the vehicle's Main Control Unit via a control bus for verifying the integrity of the power supply chain. When insufficient charge is detected, the system determines a risk of hardware node failure and may send status abnormality signals to other domain controllers via network messages, thereby triggering associated control strategy degradation.

Common Fault Symptoms

According to system logs, when this DTC is recorded, the vehicle Central Processing Unit may perceive the following phenomena:

• Left Domain Controller Partial Functionality Loss: As the system's master node or data aggregation center, the Left Domain Controller may restrict data interaction capabilities related to the Right Rear Wheel Monitor Module after receiving abnormal signals.
• Dashboard Warning Lights Illuminated: The driver may see warning icons for the Anti-lock Braking System (ABS), Body Stability Control, or Battery-related indicators lit up on the dashboard.
• Limited Vehicle Dynamic Performance: Due to inaccurate upload of sensor data, the vehicle's Electronic Stability Control system may enter a conservative mode, restricting some steering assistance or traction control functions.

Core Fault Cause Analysis

Based on the trigger logic of DTC C101000, the fault source can be classified into physical or logical anomalies in the following three dimensions:

• Hardware Components: RF Controller Failure. The Right Rear Wheel Monitor Module integrates Radio Frequency Identification (RF) functions for position calibration or communication authentication. If the power management chip, voltage regulator circuit inside the controller is damaged, or if battery aging causes excessive internal resistance, low voltage reporting will be directly triggered.
• Wiring/Connectors: Harness or Connector Fault. Wires in the power circuit may be damaged due to long-term vibration and abrasion, insulation layer damage causing short circuits; or connector pins oxidized, loose, causing excessive contact resistance. These physical connection issues lead to voltage drops before reaching the monitor module, triggering undervoltage protection logic.
• Controller: Left Domain Controller Failure. Although the fault occurs on the right rear wheel side, system determination may rely on reading and verification by the Left Domain Controller. If the Left Domain Controller's sampling circuit (ADC) for supply voltage has deviation or logical check errors, it may also lead to false reporting of this DTC.

Technical Monitoring and Trigger Logic

The On-Vehicle Diagnostic System adopts a real-time dynamic monitoring mechanism to ensure network node health status. Its judgment process follows the following technical path:

• Monitoring Target: Primarily focuses on the Input Supply Voltage of the Right Rear Wheel Monitor Module and data integrity verification on the communication bus.
• Value Range and Thresholds: The system continuously compares the measured battery voltage $V_{BAT}$ with the preset minimum operating voltage threshold. Although specific fault tolerance values vary by vehicle model platform, once the voltage is below $V_{min}$ (pre-defined low voltage limit), the system determines it as low battery. During the Fault Setup Condition, there are no special configuration requirements, and monitoring remains in an always-active state.
• Trigger Conditions: This fault is primarily triggered during the initialization self-check phase after the Ignition Switch is turned on (IG ON) or during vehicle operation. When the Right Rear Wheel Monitor Module's feedback voltage signal is detected to be persistently below the safe operating range, and transient communication interference is excluded, the Control Unit will illuminate the fault indicator light and write DTC C101000 into non-volatile memory, while recording status logs of Left Domain Controller functionality loss.