Mercedes-Benz CLK350 convertible top won't open despite pump and relay replacement on Mercedes-Benz CLK350

Some Mercedes-Benz CLK350 owners report experiencing difficulties with the convertible top not opening, even after replacing the pump and relay. These issues may stem from various factors, including a lack of power supply to the pump, which is essential for proper operation. Additionally, a malfunctioning limit switch could prevent the pump from actuating by not accurately reporting the top's position. Even with a new relay, some owners find that a faulty relay can still cause problems. If the roll bar or headrest is deployed, it may block the top from opening, necessitating a manual reset. In cases where a dead battery prevents trunk access, using the mechanical key can help. Furthermore, water ingress from clogged body cavity drains may affect the microswitches and pump functionality. Regular maintenance, such as checking the oil level in the pump and lubricating hinges, is also important to avoid these issues. If these troubleshooting steps do not resolve the problem, consulting a professional installer or specialized service center is recommended for further assistance.