DTC Code P1473 – What does this code mean for Mercedes?

<ul> <li><b>Engine Overheating</b>: The engine may overheat due to the cooling fan not operating. This can be caused by an open circuit in the fan control module (VLCM).</li> <li><b>Cooling Fan Not Operating</b>: The cooling fan may not turn on, which is a direct result of the fan circuit being open. This can lead to inadequate cooling of the engine.</li> <li><b>Check Engine Light</b>: The Check Engine Light may illuminate on the dashboard, indicating a problem with the fan circuit. This is often the first sign of an issue.</li> <li><b>Reduced Air Conditioning Performance</b>: The air conditioning system may not perform optimally due to the cooling fan not operating, which can be linked to the open circuit in the VLCM.</li> </ul>

<ul><li>The fan control module may have failed, preventing the fan from operating correctly.</li><li>There could be a break or disconnection in the wiring harness leading to the fan circuit.</li><li>A blown fuse or faulty relay might be interrupting the power supply to the fan circuit.</li><li>The fan motor itself could be defective, causing an open circuit condition.</li><li>Corrosion or poor connections at the fan circuit terminals may be causing intermittent or complete loss of connectivity.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P1473 and check for any additional codes that may be related.</li> <li><b>Visual Inspection</b>: Inspect the fan circuit wiring and connectors for any visible damage, corrosion, or disconnections.</li> <li><b>Check Voltage at Fan Connector</b>: Using a multimeter, measure the voltage at the fan connector. Ensure the voltage matches the manufacturer's specifications.</li> <li><b>Test Fan Motor</b>: Directly supply power to the fan motor to verify its operation. If the fan does not operate, the motor may be faulty.</li> <li><b>Inspect VLCM</b>: Check the Voltage Level Control Module (VLCM) for any signs of damage or malfunction. Ensure all connections are secure.</li> <li><b>Check Ground Connections</b>: Verify that all ground connections related to the fan circuit are clean, tight, and free of corrosion.</li> <li><b>Test Circuit Continuity</b>: Using an ohmmeter, check for continuity in the fan circuit wiring to ensure there are no open circuits.</li> <li><b>Replace Faulty Components</b>: If any component such as the fan motor, VLCM, or wiring is found to be faulty, replace it and clear the DTC code.</li> <li><b>Final Verification</b>: After repairs, perform a final scan to ensure the DTC P1473 is cleared and the fan circuit operates correctly.</li></ul>

<p>The DTC code P1473 indicates a 'Fan Circuit Open (VLCM)' issue in Mercedes vehicles.</p><ul><li><b>Immediate Actions:</b> Inspect the fan circuit wiring and connections for any signs of damage or disconnection. Check the Voltage Level Control Module (VLCM) for faults.</li><li><b>Potential Risks:</b> Delayed repair can lead to engine overheating, which may cause severe engine damage and reduced vehicle performance.</li></ul>