1. Locate the automatic level control height sensor under the rear of the vehicle on the rear suspension support. If the back of the car is too low and will not pump up, ground pin B Yellow wire and see if the compressor will come on and the car will raise.
2. If the car does raise when pin B is grounded, check the powers and grounds to the height sensor.
3. If the powers and grounds are OK and the pump does come on and the car raises when pin B is grounded, the height sensor will need to be replaced.
4. If the car is too high and will not come down, ground pin E White wire at the height sensor to see if the car will lower.
5. If the car lowers when the White wire in pin E is grounded, check the powers and grounds to the height sensor.
6. If powers and grounds are OK and the car does lower when pin E is grounded, the height sensor will need to be replaced.
There are two different automatic level control systems for this car; one is without RPO F45 and one is with RPO F45. The system without F45 has an automatic level control height sensor and with F45 the automatic level control compressor is controlled by the continuously variable road sensing suspension module.
1. Using a head lamp as a load, test the ELC height sensor power/grounds.
2. The power feeds are: Orange wire, pin C and a Brown wire, pin D.
3. The ground is pin A, Black wire.
4. Ground the White wire at the height sensor, check that the vent solenoid in the ELC compressor clicks and vents the air from the system.