How to Test Air Suspension Compressor Relay: Quick Guide

To test an air suspension compressor relay, check for power at the relay and ensure the relay clicks when activated. Use a multimeter for accurate readings.

Air suspension systems rely on a compressor relay to manage the air supply to the suspension components. Testing the relay ensures that the system operates smoothly and maintains proper vehicle height. Faulty relays can lead to suspension problems, affecting ride quality and safety.

Regular maintenance and testing can prevent costly repairs. Knowing how to test the relay can save time and money. Using a multimeter, you can quickly diagnose any issues. Always follow safety guidelines and consult your vehicle’s manual for specific instructions. Proper testing ensures your air suspension system remains reliable and efficient.

How to Test Air Suspension Compressor Relay: Quick Guide


Introduction To Air Suspension Compressor Relay

How to Test Air Suspension Compressor Relay

Air suspension systems make rides smoother. They use air springs instead of regular springs. The compressor relay is a key part. It controls the air compressor. This relay helps the air springs to work well. Without it, the system fails. Understanding its role is important for car owners.

The compressor relay sends power to the air compressor. This power allows the compressor to pump air. The air fills the air springs. This process makes the car ride better. The relay also stops power when needed. This helps avoid overworking the compressor. Keeping the relay in good shape is crucial.

A faulty relay can cause many issues. The air compressor may not start. This leads to a bumpy ride. Another sign is strange noises from the compressor. The air suspension warning light might turn on. These symptoms show the relay may need checking. Replacing a bad relay can fix many problems.

Essential Tools And Equipment

How to Test Air Suspension Compressor Relay

A multimeter measures voltage, current, and resistance. It’s great for testing the relay’s electrical circuit. A test light checks for power in the circuit. It’s simple to use and very effective.

Relay removal pliers help to remove the relay easily. They grip the relay firmly and prevent damage. A socket set is needed to remove bolts and nuts. It ensures you can access the relay without any issues.

Locating The Compressor Relay

How to Test Air Suspension Compressor Relay

First, find the relay panel in your vehicle. This panel is usually under the hood or dashboard. Check your vehicle’s manual for the exact location. Use a screwdriver to open the panel cover. Ensure the vehicle is off and the keys are removed. This ensures your safety while working.

Inside the panel, look for the relay diagram. This diagram shows which relay controls the air suspension compressor. The relays may look similar, so double-check the diagram. Sometimes, the relays have labels or numbers. Compare these with the diagram to find the correct one. Use your vehicle’s manual if you need extra help.

How to Test Air Suspension Compressor Relay: Quick Guide


Relay Removal Process

How to Test Air Suspension Compressor Relay

Always wear safety gloves and goggles. Ensure the car is on a flat surface. Turn off the engine completely. Disconnect the battery to avoid shocks. Keep children and pets away from the work area. Use proper tools for the job.

Locate the relay box under the hood. Check the diagram on the box cover to find the relay. Gently remove the cover using a screwdriver. Identify the air suspension compressor relay. Use needle-nose pliers to pull out the relay. Be careful not to damage other components. Place the removed relay in a safe spot for testing.

Testing The Relay With A Multimeter

How to Test Air Suspension Compressor Relay

Turn on the multimeter and set it to measure resistance. Connect the black probe to the common (COM) port. Insert the red probe into the port labeled for resistance or ohms. Ensure the multimeter reads zero when the probes touch each other.

Touch the probes to the relay’s terminals. Check the multimeter display for a reading. A good relay shows continuity with a reading close to zero ohms. No reading or infinite resistance means the relay is bad.

How to Test Air Suspension Compressor Relay: Quick Guide


Bench Testing The Relay

Bench testing the air suspension compressor relay ensures its functionality. Connect the relay to a power source and multimeter to check for proper operation. This quick test helps identify potential issues with the relay before installation.

How to Test Air Suspension Compressor Relay

Preparing For Bench Testing

First, gather all tools you need. You will need a multimeter, jumper wires, and a power source. Ensure the relay is clean and free from dirt. Place the relay on a stable surface. Make sure you have a clear workspace.

Conducting The Bench Test

Connect the relay to the power source using jumper wires. Check the relay’s diagram for correct connections. Use the multimeter to measure the output. A good relay should show continuity between certain pins. If no continuity, the relay is bad. Test multiple times to confirm results.

Analyzing Test Results

How to Test Air Suspension Compressor Relay

Check the relay’s response to the test. If the relay clicks, it is usually good. No click may indicate a problem. Use a multimeter to measure voltage. A healthy relay will show the correct voltage. If voltage is zero, the relay might be faulty. Inspect the relay connections. Loose connections can affect performance. Ensure all wires are secure. A secure connection is crucial for relay health.

Fault Implication
Burnt contacts Poor electrical connectivity
Loose connections Intermittent relay operation
Stuck relay Compressor may run constantly
Corroded terminals Reduced relay efficiency

Replacement And Reinstallation

How to Test Air Suspension Compressor Relay

Find the correct relay for your vehicle. Check the vehicle’s manual for the right part number. Buy a high-quality relay from a trusted store. Ensure the relay matches the specifications of the old one. Double-check the voltage rating and pin configuration. This will help avoid any mismatch issues.

Turn off the vehicle and remove the key. Disconnect the battery to ensure safety. Locate the relay box and open it carefully. Remove the old relay by pulling it out gently. Insert the new relay into the correct slot. Ensure it fits snugly and is not loose. Reconnect the battery and test the system. The air suspension should work properly now.

Final System Check

Ensure your air suspension system operates smoothly by testing the compressor relay. Inspect connections and measure voltage for accurate results.

Verifying Functionality Post-repair

Turn on the vehicle and listen for the air compressor. It should start if the system is working. Check the height of the vehicle. Make sure it matches the desired settings. Inspect the dashboard for any warning lights related to the suspension system. If there are no warning lights, the system is likely functioning well.

Troubleshooting Post-installation Issues

If the compressor does not start, check the relay connections. Ensure they are tight and secure. Test the relay with a multimeter to confirm it is working. If the vehicle height is incorrect, re-calibrate the system as per the manual. Look for any air leaks in the suspension system. Replace faulty parts if needed.

Maintenance Tips

How to Test Air Suspension Compressor Relay

Check the air suspension compressor relay every few months. This helps spot early signs of wear and tear. Keep an eye on the relay connections. They should be clean and tight. Look for any signs of rust or corrosion. Rust can cause relay failure. Listen for unusual noises from the compressor. Strange sounds can mean a problem.

Ensure the compressor is running smoothly. A well-maintained compressor lasts longer. Replace the air filter regularly. This keeps the system clean. Check the air lines for leaks. Leaks can cause the system to fail. Use the right type of air suspension fluid. This helps the system work better.

Frequently Asked Questions

How To Test An Air Compressor Relay?

To test an air compressor relay, first disconnect power. Use a multimeter to check for continuity. Ensure relay terminals show proper resistance. Reconnect power and test operation.

How Do You Know If Your Air Suspension Compressor Is Bad?

Your air suspension compressor might be bad if the vehicle sags, makes unusual noises, or fails to lift properly.

What Are The Symptoms Of An Airmatic Relay?

Symptoms of a faulty AirMatic relay include suspension sagging, unusual noises, uneven vehicle height, and error messages on the dashboard.

What Does An Air Suspension Relay Do?

An air suspension relay controls the air compressor and valves. It ensures proper inflation and deflation of the air springs.


Testing your air suspension compressor relay is essential for vehicle performance. Follow the steps carefully to ensure accuracy. Regular checks can prevent future issues and save on repair costs. Keep your air suspension system in top condition for a smooth and safe ride.

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