meaning the Control Unit cannot correctly parse timing signals or pulse count data from the combination switch. In the vehicle electrical architecture, the Combination Switch (Combination Switch, abbreviated CS) is responsible for transmitting key driving status information to the master control module. When the system reports Combination Switch System Function Failure, it indicates that the master processor failed to receive signal feedback loop data consistent with expectations. This fault code specifically points to Right CS Counter Error, indicating that in the signal processing logic layer, the specific timer channel (Right CS Channel) failed to meet preset logic thresholds or stability requirements. This typically occurs at critical nodes when the vehicle enters diagnostic mode, reflecting deviations between internal module control and the whole vehicle network communication or physical counting mechanism failure.

Common Fault Symptoms

Based on the underlying definition of Combination Switch System Function Failure, this fault code may manifest as the following perceptible phenomena during actual driving:

• Dashboard Warning Feedback: When detection occurs that the Ignition Switch is placed in ON position, relevant diagnostic lights or system status indicator lights on the instrument panel may abnormally light up or flash.
• Auxiliary Function Response Delay: Function modules relying on combination switch signals (e.g., clock display, cruise control initialization) may exhibit sluggish response or malfunction.
• Logic Count Deviation Phenomenon: Due to unstable internal counters, recorded time data may differ from actual operating time, or transient system error messages may appear under specific operating conditions.
• System Enters Safety Mode: To ensure driving safety, the Control Unit may restrict partial output instructions, manifested as combination switch-related functions being temporarily disabled.

Core Fault Cause Analysis

Targeting the root cause of Combination Switch Failure, combined with general logic of vehicle diagnostic architecture, principles can be analyzed from the following three dimensions:

• Hardware Components (Physical Connection): Electronic components or contacts inside the combination switch assembly may age, oxidize, or wear out due to long-term use. Particularly when open circuits, short circuits, or excessive contact resistance occur inside the signal transmission module, pulse signals cannot pass completely. For hardware parts involving counters, if integrated chip internal logic circuits are unstable, it will directly trigger Right CS Counter Error.
• Wiring/Connectors (Physical Connection): Although original data primarily points to switch failure, in the actual diagnostic link, the harness connecting the combination switch and control unit may have intermittent short circuits, loose connections, or insulation damage. These factors cause fluctuations in analog signals or digital pulses transmitted to the control unit, thereby causing count logic failure.
• Controller (Logic Operation): Internal software algorithms of the control unit receiving signals may detect signal timing exceeding allowable ranges. If the Control Unit cannot confirm valid CS counter values within expected time windows, or receives non-compliant level states, the system will judge logical abnormalities and record C1C6002.

Technical Monitoring and Trigger Logic

The determination of this fault code relies on strict input signal verification mechanisms, with specific technical monitoring details as follows:

• Monitoring Target: The Control Unit monitors in real-time Pulse Frequency, Duty Cycle, and specific state bit change speeds sent by the Combination Switch. The system focuses on monitoring whether the numerical accumulation of the Right CS Counter matches the expected sequence.
• Trigger Condition Parameters:
• Signal Level Requirement: During drive motor or function activation, input signal logic level status needs to be stable within the $V_{IH}$~$V_{IL}$ standard range (specifically depending on control unit internal reference voltage setting).
• Time Window Limit: The system requires completing a complete count cycle within a preset time threshold. If signal interruption exceeds allowed minimum pulse interval, the counter will be judged as abnormal.
• Specific Condition Judgment: The core trigger node for fault determination occurs at the instant of Ignition Switch placed in ON position. After the ignition system enters ON state, the Control Unit immediately begins initializing combination switch communication handshake process. Once Right CS Counter Error is detected within subsequent monitoring cycles, and if this abnormality persists beyond set duration (e.g., $T_{threshold}$), the system will finally confirm fault and store DTC C1C6002.

Cause Analysis Targeting the root cause of Combination Switch Failure, combined with general logic of vehicle diagnostic architecture, principles can be analyzed from the following three dimensions:

• Hardware Components (Physical Connection): Electronic components or contacts inside the combination switch assembly may age, oxidize, or wear out due to long-term use. Particularly when open circuits, short circuits, or excessive contact resistance occur inside the signal transmission module, pulse signals cannot pass completely. For hardware parts involving counters, if integrated chip internal logic circuits are unstable, it will directly trigger Right CS Counter Error.
• Wiring/Connectors (Physical Connection): Although original data primarily points to switch failure, in the actual diagnostic link, the harness connecting the combination switch and control unit may have intermittent short circuits, loose connections, or insulation damage. These factors cause fluctuations in analog signals or digital pulses transmitted to the control unit, thereby causing count logic failure.
• Controller (Logic Operation): Internal software algorithms of the control unit receiving signals may detect signal timing exceeding allowable ranges. If the Control Unit cannot confirm valid CS counter values within expected time windows, or receives non-compliant level states, the system will judge logical abnormalities and record C1C6002.

Technical Monitoring and Trigger Logic

The determination of this fault code relies on strict input signal verification mechanisms, with specific technical monitoring details as follows:

• Monitoring Target: The Control Unit monitors in real-time Pulse Frequency, Duty Cycle, and specific state bit change speeds sent by the Combination Switch. The system focuses on monitoring whether the numerical accumulation of the Right CS Counter matches the expected sequence.
• Trigger Condition Parameters:
• Signal Level Requirement: During drive motor or function activation, input signal logic level status needs to be stable within the $V_{IH}$~$V_{IL}$ standard range (specifically depending on control unit internal reference voltage setting).
• Time Window Limit: The system requires completing a complete count cycle within a preset time threshold. If signal interruption exceeds allowed minimum pulse interval, the counter will be judged as abnormal.
• Specific Condition Judgment: The core trigger node for fault determination occurs at the instant of Ignition Switch placed in ON position. After the ignition system enters ON state, the Control Unit immediately begins initializing combination switch communication handshake process. Once Right CS Counter Error is detected within subsequent monitoring cycles, and if this abnormality persists beyond set duration (e.g., $T_{threshold}$), the system will finally confirm fault and store DTC C1C6002.