I have no owners manual. which relay is for air ride compressor

Anonymous wrote the right answer.

Anonymous Jan 02, 2022

What kind of scan tool ? Will it scan all the modules on the vehicle or is it just OBD2 type ? Did you check wiring diagrams an test electrical circuits for air ride an test with a DVOM - digital volt ohmmeter ? Do you know how to test ALC relay circuits . You replaced a bunch of parts that probably were not needed (,air ride compressor, fuses and ALC relay and the compressor still won't work ) ?

Which of these does your vehicle have

Automatic Level Control
Electronic Suspension Control (ESC)
The vehicles rear leveling compressor motor is switched on and off via a compressor motor relay which is controlled by the suspension control module. The suspension control module provides a switched path to ground whenever compressor activity is required. The suspension control module continually monitors the compressor motor relay circuitry to determine if the voltage level agrees with the commanded state.

DTC C0655 Level Control Compressor Circuit

DTC C0660 Level Control Exhaust Valve Circuit

The exhaust solenoid valve is switched on and off via the suspension control module. The suspension control module provides a switched path to ground whenever exhaust activity is required and during a compressor "head-relief" sequence which occurs at compressor start-up if system pressure is lower than 68.95 kPa (10 psi). The suspension control module continually monitors the exhaust solenoid valve circuitry to determine if the voltage level agrees with the commanded state.

DTC C0711 Level Control Air Pressure Sensor Circuit

Circuit Description
The suspension control module uses a 5-volt analog air pressure sensor to determine the amount of air pressure in the automatic level control (ALC ) system. The valid signal voltage range of the sensor is 0.15-4.85 volts. The sensor signal voltage will increase and decrease within the valid voltage range as system pressure increases and decreases.


Your best bet ,take it to a qualified repair shop that knows what they are doing .

Their are no usual spots you will need to check fuses relays connectors and sensors anything can or could have been removed or jumped

This info should be in your owners manual. #111 in the picture, interior fuse box.

The compressor magnetic clutch is located and attached to the front of the AC compressor and the engine drive belt goes over it

Hello, If you have any work done on your car or put something in the trunk, there is a switch on the Drivers rear quarterpane for the Air ride. Someone may have switched it off.

The system works like this. All four doors and the trunklid must be closed for the Air ride to cycle. The doorjam switches must indicate a closed position. There is a vent solenoid usually on the Drivers front inside fender, down low under the headlight area. You can follow the air lines to this part.

You need to look in your Owners manual for a Relay in the Powerbox where all the Relays stay. If the Relay is bad, your fuse will not get power. Check the hot side of the fuse with a testlight or Voltmeter looking for power when the Key is on and the doors are closed. If no power, blame the Relay. Change it and it may be the only problem in the system. Check the fuse socket again.

If you have power, the Air ride vent Solenoid may be bad. There are scanners which have the extra test function and there is a separate Diagnostic plug, usually around the passengers inner fender. If you pay to have this checked, it will save money on Labor costs by pin-pointing the problem quickly. It is very difficult to check the wires on each doorjam, the individual bag sensors, and motor connections without the Diagnostic plug.

I hope my solution about the Relay is all you need and is very helpful to you.

No, unless you test the relay and it shows that it is faulty.

It is located under the air cleaner box. the fuse is located with the relay in the fuse box under the hood, it is not marked but there should be info in the owners manual.

Air Suspension Compressor Motor/Vent Solenoid : Lower RH front corner of engine compartment C134
Air Suspension Switch : Rear side of trunk C458
Air Suspension/EVO Steering Module : Behind RH cowl panel, above connector bracket C204, C205
Air Suspension/EVO Test Connector : RH side of engine compartment, top of wheel well C117 Soft Ride Relay : Under center front of package tray C403Hard Ride Relay : Under center rear of package tray C404 sorry could not find compressor rely listed, good luck

why can't you disconnect the power at the motor?

There are 3 fuses.
No. 6(5amp) in interior fuse panel is the ignition feed to module
no. 4 (15amp) in the underhood fuse panel feeds the coil side of the compressor/vent solenoid in the compressor.
no. 15(50amp) in the underhood fuse panel feeds the switch side of the compressor relay.

Also if you would like an owners guide go to this website and pick pwner guide on the left task bar then input your info then pick get owner guide.
http://www.genuineservice.com/genuineservice/en/default?page=genuineService