Pulsar Air Suspension Failure

Based on your description, it sounds like a malfunction within the suspension system, possibly the suspension pump. Have you inspected the cable and plug connections to the compressor? A defective connection is a common culprit and aligns well with the symptoms you've described. Also, do you hear the compressor trying to run when you start the car?

I had a quick look at the connections, but I'm not really sure what I'm looking for. Is there a specific way to test the cable or plug connection to see if it's defective? I don't hear any sounds coming from where the compressor is located when I start the car.

Given that you hear no activity from the compressor, and considering your limited experience with electrical diagnostics, I strongly recommend taking your Nissan Pulsar to a qualified workshop. A professional can accurately diagnose the fault and confirm if it's solely a cable/plug issue, or if the compressor itself has failed. Continuing without proper testing could lead to further complications.

I took it to a local mechanic, and you were right, it was a faulty connector at the compressor. They replaced the connector, and the suspension is working now. The total cost was 95€.