🚨 Diagnostic Profile
Vehicle/Equipment Make: GENERIC
Technical Description: A/V Sensor Washer Fluid C Control Circuit
This fault code indicates an irregularity within the control circuit responsible for the A/V (Audio/Video or Automated Vision, depending on system architecture) sensor’s washer fluid delivery system, specifically on the ‘C’ designated circuit. This typically affects camera lens cleaning systems used for ADAS (Advanced Driver Assistance Systems) sensors, such as forward-facing cameras or LIDAR units. A fault here usually points to a wiring issue, a failed pump relay, or an internal fault within the washer fluid pump motor itself, preventing the system from verifying proper fluid delivery to the sensor lens.
🚨 Repair Difficulty Tier
Difficulty Rating: [Intermediate]
This repair falls into the Intermediate category. While the physical replacement of a washer pump or relay is mechanically straightforward, accurately diagnosing this circuit requires the use of a digital multimeter to test for continuity, resistance, and voltage drop across the wiring harness. Additionally, confirming the repair often requires a scan tool capable of reading live sensor data and clearing specific ADAS-related fault codes, which exceeds basic hand-tool capability.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the washer fluid reservoir to ensure adequate fluid levels, as low fluid is a common false trigger for this code. Next, trace the wiring harness from the control module to the washer pump and nozzle assembly near the A/V sensor. Look for any frayed wires, corrosion at connector pins, or physical damage to the tubing that may indicate a pinched line or electrical short causing the ‘Circuit C’ malfunction.
Step 2: Diagnostic Verification
Connect a diagnostic scan tool to the vehicle’s OBD-II port to pull live data from the sensor control module. Attempt to actuate the washer pump manually through the bi-directional controls menu if available. If the pump does not engage, use a multimeter to check for proper voltage (typically 12V) at the pump connector while the activation command is sent. If voltage is present but the pump does not run, the pump motor itself is likely faulty. If no voltage is present, proceed to check the relay and corresponding fuse box circuit for continuity.
Step 3: Resolution & Reset Process
If the wiring and connectors test positive for continuity and proper voltage, replace the washer pump motor assembly. If the issue is traced to a specific wiring segment, repair or replace the damaged harness section using OEM-spec wiring and weatherproof connectors. Once the physical repair is complete, use the scan tool to clear the stored Diagnostic Trouble Code (DTC). Perform a system reset or relearn procedure if specified by the manufacturer, then test the washer function several times to confirm the control circuit recognizes successful fluid delivery without re-triggering the fault.
📦 Parts, Labor, and Budget Estimates
Required Components/Software: Washer Fluid Pump Motor, Control Relay, Wiring Harness Repair Kit, OBD-II Diagnostic Scan Tool (with bi-directional control capability).
Average Component Price: $45 – $180 USD (depending on whether a pump replacement or simple relay/wiring repair is needed).
Estimated Labor Hours: 0.5 – 1.5 Hours (Standard shop book time for diagnosis, part replacement, and DTC clearing).