Atlantic British Ltd. - Largest Independent Supplier of Parts & Accessories for Land Rovers

Electrical control unit – ECU

The ECU is located underneath the right hand front seat, on top of the fuel ECU. It maintains the requested vehicle ride height by adjusting the volume of air in each air spring. It is connected to the cable assembly by a 35-way connector.  To ensure safe operation the ECU has extensive on board diagnostic and safety features.  The ECU is non-serviceable, in case of failure it must be replaced. 

Power supply for the system consists of the following components:

1. Delay power turn off relay.  This remains powered up for 20 seconds after existing vehicle to allow self-leveling.

2. Compressor relay, 4 pin.

3. Warning light relay, 5 pin.

4. 30-amp “maxifuse” for compressor power.

5. 15-amp fuse for ECU, pin 1.

The disable switch 6 is mounted under the right hand front seat. The switch has no markings, in the DISABLE position the bottom of the switch is pushed in.  It is used to disable system when vehicle is being delivered, or when working on the system after depressurizing.  The switch disables the system at speeds below 35mph (56kph).