Air Supply Unit Access

The acoustic box, which comprises of two parts; upper and lower, surrounds the air supply unit. The acoustic box is a plastic moulding which is lined with insulating foam which suppresses the operating noise of the air supply unit.

The air supply unit supplies dry compressed-air into the air suspension system where it is directed into the air springs or the reservoir by solenoid operated valves. Air can be exhausted from the system when required by the opening of an air spring or reservoir valve in addition to the exhaust valve, which is part of the air supply unit.

The compressor operates to pressurize either the reservoir or to inflate one or more of the air springs. The compressor will not operate without the engine running, with the following exceptions:

• During remote operation to raise the vehicle to allow for the attachment of a trailer.
• When under control of a Land Rover approved diagnostic system.

There are a number of conditions that will inhibit operation of the air supply unit. It is vitally important that these system inhibits are not confused with a system malfunction. A full list of air supply unit inhibits are given in the compressor of this document.