How to Install a Digital Air Controller (2026 Guide)
Fitting a digital air controller turns your load assist airbags into a system you can adjust from the cab, without crawling under the vehicle with a hand pump every time the load changes. This guide walks through a standard installation on a ute or 4WD running Boss Air Suspension load assist airbags, from mounting the control unit to testing pressure at both ends.
- Installing a digital air controller takes 2-3 hours for most utes and 4WDs with an existing load assist airbag kit fitted.
- The PX01 3-button digital air controller kit and the Boss Auto Pressure Controller Kit with PX06 compressor cover most standard installs in 2026.
- Mount the compressor away from heat and moisture, run air line without kinks, and pressure-test every fitting before driving.
- Skip mounting the control panel near the steering column - vibration and heat shorten switch life.
Why this matters
A manual load assist kit needs a hand pump or a garage air line to adjust pressure. That's fine if you set it once and leave it, but most owners change loads often - empty for the daily commute, loaded for the tip run, fully loaded towing the van.
A digital air controller lets you adjust airbag pressure from the driver's seat, in seconds, every time the load changes. Get the install wrong and you end up with air leaks, a compressor that runs constantly, or a control panel that fails within months. Get it right and the system runs reliably for years.
What you'll need
- Digital air controller kit (PX01 3-button, Impressor digital incab, or a Boss Auto Pressure Controller Kit with compressor and tank)
- Load assist airbags already fitted and pressure-tested - if you haven't fitted these yet, check the vehicle-specific kit for your model, such as the Hilux load assist kit for 2015-plus Toyota Hilux 4WD models
- 12V power source with an inline fuse
- Drill with a step bit for panel mounting
- Cable ties, self-tapping screws, and heat-shrink connectors
- Thread sealant tape for air fittings
- A soapy water spray bottle for leak testing
- Basic hand tools - socket set, screwdrivers, wire strippers
- 2 to 3 hours of uninterrupted time
Budget more time if you're also fitting the compressor and tank from scratch rather than adding a controller to an existing onboard air system.
The steps
1. Plan the mounting locations before you drill anything
Decide where the compressor, tank, and control panel will sit before you pick up a drill. The compressor needs airflow and protection from water spray - under the tray or behind a wheel arch liner works for most utes. The control panel needs to be visible and reachable from the driver's seat without blocking airbags or switches.
Mistake to avoid: mounting the compressor directly above the exhaust or too close to the diff. Heat shortens compressor life and can affect pressure readings.
2. Mount the compressor and tank
Secure the compressor using the supplied bracket, keeping it clear of moving suspension components and road spray. If your kit includes an aluminium air tank, mount it somewhere solid - chassis rail or tray frame - using U-bolts or a bracket, not just cable ties.
An air tank lets the compressor cycle less often because stored air handles small pressure changes without the compressor kicking in every time. This matters most on 2026-model utes with tighter engine bay clearances where compressor mounting options are limited.
3. Run and secure the air line
Route 1/4 inch air line from the tank or compressor to each airbag, following the chassis rail and avoiding heat sources, sharp edges, and moving parts like sway bars or drive shafts. Leave a small amount of slack at the airbags to allow for suspension travel.
Secure the line every 300-400mm with cable ties or clips. A line that flaps around will eventually chafe through on a chassis edge - that's the single most common cause of slow leaks reported after DIY installs.
Expected outcome: air line runs cleanly from the tank to both airbags with no kinks, no tight bends, and no contact with hot or moving components.
4. Wire the compressor and control panel to 12V power
Run a fused power feed from the battery or a switched accessory circuit to the compressor, and a separate feed to the control panel if required by your kit. Follow the wiring diagram supplied with your specific controller - the PX01 3-button digital air controller kit and Impressor systems use different terminal layouts.
Use an inline fuse rated to the compressor's draw, and route wiring away from exhaust heat and moving suspension parts. Loose or unfused wiring is the most common reason a digital controller stops responding within the first few months.
5. Connect the control panel and test switch response
Mount the control panel in the cab, connect it per the wiring diagram, and confirm each button or gauge responds correctly before closing anything up. Press each control and watch for compressor activation and pressure change on the readout.
If you're upgrading from a manual system to a full digital setup with independent left and right control, an AccuAir Pressure Sensor Kit adds pressure-based feedback so the controller reads actual airbag pressure rather than just running on timer or manual input.
6. Pressure-test every connection
With the system powered up, inflate the airbags to a moderate pressure and spray every fitting with soapy water. Bubbles mean a leak - tighten the fitting, reapply thread tape if needed, and retest.
Don't skip this step to save ten minutes. A slow leak that isn't caught now shows up weeks later as a sagging rear end and a confused phone call to Boss Air Suspension asking why the airbags won't hold pressure.
7. Set and confirm ride height at both empty and loaded weights
With the vehicle empty, note the ride height and airbag pressure. Load the vehicle to a typical working weight - tools, camping gear, or a loaded trailer on the tow ball - and adjust pressure until the rear sits level again.
Record both pressure settings so you're not guessing every time the load changes. Most digital controllers let you save preset levels, which is worth setting up now rather than later.
Troubleshooting
Compressor runs constantly and never shuts off. Check for a leak at the tank, airbag, or fitting first - a system holding pressure properly should cycle occasionally, not continuously. If there's no leak, the pressure switch inside the control unit may be set or wired incorrectly.
Control panel shows no response when pressed. Check the fuse first, then confirm the power connection at the panel itself. A loose ground connection is a common cause and is often mistaken for a faulty panel.
Airbags inflate unevenly side to side. This usually points to a pinched or kinked air line on one side, or a fitting that isn't fully seated. Re-check the full length of both lines from tank to airbag.
Pressure drops overnight with the vehicle parked. A drop of a few PSI overnight can be normal in cold weather as air contracts, but anything more suggests a slow leak. Re-run the soapy water test on every fitting, including ones that tested fine during install.
Compressor draws down the battery when the vehicle is off. Confirm the power feed runs through a switched circuit or has its own isolator, not a permanently live feed. A compressor wired to constant power will drain the battery if a leak develops while the vehicle is parked.
Tools and resources
- PX01 3-button digital air controller kit - standard in-cab control for load assist airbags
- Boss Auto Pressure Controller Kit with PX06 compressor - complete kit with compressor, tank, and fittings for a full onboard air setup
- Thread sealant tape, cable ties, and an inline fuse rated to your compressor
- A soapy water spray bottle for leak testing
What to do next
Once the controller is installed and holding pressure at both ends, the next question is what pressure to actually run for your load. Read up on right PSI for your load assist airbags before you finalise your presets - running too high or too low undoes a lot of the benefit of having a digital controller in the first place.
If you're still deciding which controller suits your setup, the digital air controller comparison guide covers the difference between basic 3-button units and full pressure-sensor systems.
FAQ
How long does it take to install a digital air controller?
Most installs take 2 to 3 hours if the load assist airbags are already fitted and pressure-tested. Add extra time if you're also mounting a compressor and tank from scratch.
Do I need a compressor to run a digital air controller?
Yes, the controller needs a compressor to add air and a tank helps reduce how often it cycles. Kits like the Boss Auto Pressure Controller Kit with PX06 compressor include both in one package.
Can I install a digital air controller myself?
Most owners with basic mechanical skills and hand tools can fit a digital air controller in an afternoon. If you're not confident with 12V wiring or air line routing, a workshop install avoids costly mistakes.
What PSI should I run my load assist airbags at?
PSI depends on the load and the specific airbag kit fitted to your vehicle, which is why a digital controller with saved presets is useful. Check your kit's fitment guide for a starting range, then adjust once loaded.
Why does my compressor keep running after installing the controller?
A compressor that won't stop cycling almost always points to a leak somewhere in the system. Spray every fitting with soapy water and look for bubbles before assuming the controller itself is faulty.
Is a digital air controller better than a manual pump for load assist airbags?
A digital controller lets you adjust pressure from the cab in seconds rather than crawling under the vehicle with a hand pump. It's a practical upgrade for anyone who changes load frequently, such as tradies or tow vehicle owners.
Will a digital air controller void my airbag warranty?
A correctly installed controller shouldn't affect coverage on the airbags themselves, but check the specific warranty terms for your kit. Boss Air Suspension load assist kits carry a five-year warranty when fitted and used as intended.
One last thing
The part most DIY installers skip is recording pressure settings at both empty and loaded weight before the first drive. Without that reference point, you end up guessing every time conditions change, which defeats the purpose of fitting a digital controller in 2026 rather than sticking with a manual pump.
