RH Rear Height Sensor

RH Rear Height Sensor

The air suspension ECU (C0867) provides a feed to the RH rear height sensor (C1698) on a YB wire. An earth path is provided for the sensor on a YN wire. By measuring the voltage returned on a YS wire, the air suspension ECU can determine the height of the RH rear of the vehicle.

LH Rear Height Sensor

The air suspension ECU (C0867) provides a feed to the LH rear height sensor (C1699) on a WB wire. An earth path is provided for the sensor on a WN wire. By measuring the voltage returned on a WS wire, the air suspension ECU can determine the height of the LH rear of the vehicle.

Cross Link Valves

The cross link valves connect the height sensors in pairs, front and rear. When air is required to flow between the two rear height sensors, the air suspension ECU (C2030) provides a feed to the rear cross link valve (C2033) on a UR wire. The air suspension ECU provides an earth path for the cross link valve on a UP wire.

When air is required to flow between the two front height sensors, the air suspension ECU (C2030) provides a feed to the front cross link valve (C2032) on a UN wire. The air suspension ECU provides an earth path for the cross link valve on a WU wire.

Air Supply Unit

The air supply unit is located in a sealed housing in the spare wheel well. Located within the unit is the compressor. To power the compressor, the air suspension ECU (C0867) provides a feed to the air suspension relay coil (C2022) on a B wire. The relay is located in the rear fuse box and is earthed (C2021) on an N wire. The energised relay (C2023) provides a battery feed from fuse 18 of the rear fuse box to the compressor (C0873) on an RY wire. The compressor (C0873) is earthed on an N wire.

The air suspension ECU (C0867) monitors the temperature within the air supply unit (C0873) by providing a feed to the temperature sensor on a BRY wire. The air suspension ECU determines the temperature within the air supply unit by measuring the voltage returned on an S wire.