Air Suspension Compressor

This procedure addresses a request to replace an air suspension compressor on a 2016-2021 Honda Civic 1.5L Turbo. However, this vehicle is equipped with conventional spring suspension from the factory and does not have air suspension components.

Warnings

Tools required

Parts

• Air suspension compressor (aftermarket kit component) × 1 — Specific to aftermarket air suspension kit installed
• Air line fittings/o-rings × 1 — Specific to aftermarket air suspension kit installed

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place wheel chocks behind wheels that will remain on ground
3. Locate air suspension compressor (typically in trunk or rear wheel well area depending on aftermarket kit)
4. Disconnect negative battery terminal if compressor has direct battery connection
5. Allow air suspension system to fully depressurize using manufacturer's deflate procedure or wait 30 minutes after vehicle shutdown

Procedure

1. 1

   Access compressor location
   Remove trunk floor panel, side trim panels, or wheel well liner as needed to access the air suspension compressor. Most aftermarket kits mount the compressor in the trunk area driver side or passenger side rear wheel well. Remove any fasteners securing access panels.
2. 2

   Disconnect electrical connections
   Locate the electrical connector(s) on the air compressor. Press the release tab and disconnect the main power connector. If equipped with a pressure sensor connector, disconnect it as well. Label connections if multiple connectors are present.
3. 3

   Disconnect air supply lines
   Verify system is fully depressurized. Disconnect the air supply line(s) from the compressor outlet. Most aftermarket systems use push-to-connect fittings - press the collar and pull the line out. Disconnect the intake filter or inlet line if equipped. Cap or plug open lines to prevent debris entry.
   ⚠Ensure system pressure is at zero before disconnecting lines. Residual pressure can cause air lines to whip and cause injury.
4. 4

   Remove compressor mounting hardware
   Remove the mounting bolts or brackets securing the air compressor to the vehicle chassis or mounting plate. Most aftermarket compressors use 2-4 mounting bolts. Support the compressor weight while removing the final fastener.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
5. 5

   Remove compressor assembly
   Carefully extract the air suspension compressor from its mounting location. Note the orientation and routing of any attached components like relay boxes, pressure switches, or check valves that may be integrated into the assembly.
6. 6

   Install new compressor
   Position the new air suspension compressor in the mounting location, ensuring proper orientation matches the original installation. Align mounting holes with chassis or bracket. Install mounting bolts finger-tight initially.
7. 7

   Torque mounting bolts
   Torque all compressor mounting bolts to specification in a cross-pattern if multiple bolts are used. Ensure compressor is seated flush against mounting surface and does not rock or shift.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
8. 8

   Reconnect air supply lines
   Reconnect air supply lines to the compressor outlet port(s). Push push-to-connect fittings fully until they click and seat. Tug gently to verify secure connection. Reconnect intake filter or inlet line. Inspect all o-rings and replace if damaged.
9. 9

   Reconnect electrical connections
   Reconnect the main power connector to the air compressor until it clicks into place. Reconnect any pressure sensor connectors if equipped. Ensure connectors are fully seated and locked.
10. 10

    Reinstall access panels
    Reinstall trunk trim panels, floor panels, or wheel well liner that were removed for access. Secure all fasteners and ensure no wiring or air lines are pinched by panels.

Reassembly

1. Reconnect negative battery terminal if it was disconnected
2. Verify all air line connections are secure and not kinked
3. Ensure no tools or parts were left in trunk or wheel well areas
4. Check that all trim panels are properly secured

Verification

• Turn ignition to ON position (engine off) and listen for compressor activation during system self-check
• Start engine and allow air suspension system to pressurize to normal operating pressure (typically 100-150 PSI depending on kit)
• Verify no air leaks are present at compressor connections by listening for hissing sounds
• Test air suspension raise/lower function using system controls to confirm compressor operation
• Check for any warning lights on dashboard related to suspension system
• Perform a visual inspection under vehicle to confirm no air lines are dragging or damaged
• Test drive vehicle and verify normal suspension operation and ride height adjustment if equipped

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