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Where is the air pump relay for the Mercedes GL550 located?

2 Answers
MacAddyson
08/31/25 7:10am
The air pump relay for the Mercedes GL550 is located under the left rear seat. You can access it by manually pulling up the left rear seat, where you will find a fuse box underneath. Function of the air pump relay: Its role is to supply power to the air pump. Generally, a single-cylinder air pump is sufficient for small vehicles, while commercial or off-road vehicles require a high-power, preferably dual-cylinder air pump. As an electrical control device, the relay connects in the circuit to form two types of control systems: the control system (also known as the input circuit) and the controlled system (also known as the output circuit). Working principle of the air pump relay: The power line passes through the contactor and then connects to the relay. The relay's switch controls one of the lines. If the air pump is also three-phase, the remaining two lines do not need relay control and can be directly connected. If any one of the lines lacks power, the air pump will not operate.
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LeRemington
09/13/25 3:29am
As a car enthusiast who often helps with repairs, I've noticed that the air pump relay for the Mercedes GL550 is usually installed in the engine compartment's fuse box. This box is typically located near the battery, and opening the lid reveals a row of relays; the one for the air pump is marked with a small bulb or suspension symbol. If you're trying to locate it yourself, I recommend checking the user manual or owner forums first, as some older models might have it under the passenger-side dashboard. Don't rush to take things apart—testing the relay is straightforward: use a multimeter to check pin connectivity; if there's no response, it's likely faulty. Regular maintenance of the air suspension should include being cautious of moisture, as it can corrode the contacts. I've encountered multiple instances where relay failures caused suspension malfunctions, which can be quite frustrating to fix. It's best to use original manufacturer parts rather than off-brand ones. If you run into issues you can't resolve, I recommend visiting a professional shop to scan with diagnostic tools—it saves time and ensures safety.
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