Raising the Vehicle

When a load is added to the vehicle, the vehicle body moves down causing the suspension position sensor actuating arm to rotate upward. (An arm movement of about 25 mm (1 inch) amounts to a height change of approximately 12 mm (0.5 inch) at the rear bumper.) The upward arm movement activates an internal timing circuit inside the position sensor and after an initial fixed delay of 17 - 27 seconds, the sensor provides a ground to complete the compressor relay circuit. The 12V (+) circuit to the compressor is then complete and the compressor runs, sending pressurized air to the shock absorbers through the air tubes.

As the shock absorbers inflate, the vehicle body moves upward rotating the actuating arm towards its original position. Once the body reaches its original height, +/- 25 mm (+/- 1 inch), the position sensor opens the compressor relay circuit, and the compressor is turned off.