Cargo LED Light for Subaru Ascent

The stock cargo lighting in the Subaru Ascent is inadequate, often obstructed by cargo, making the side light ineffective. This 3D-printed LED fixture addresses the issue by integrating a dedicated overhead light, powered by the existing side cargo light.
 

Bill of Materials
3D-printed parts:
- Base – 1 piece
- Side covers – 2 pieces

Lighting & Wiring:
- 12V LED strip (white/warm white, 10mm wide) – cut approximately 150mm
- Connecting wires & 2-pin JST connectors

Tools & Supplies:
- Electrical insulation tape & hot glue
- Soldering iron & soldering supplies
- Nylon pry tools (for trim removal)
 

Step 1: Print & Install the Parts
1.1 Trim Removal
- Use nylon pry tools to remove the rear inner trim. It is secured by four internal clips.
- Begin prying gently from one side, then pull down firmly but carefully until it separates.

1.2 Print & Prepare Components
- Print the LED strip enclosure and side covers.
- The enclosure features two channels:
- Bottom channel – holds the LED strip.
- Top channel – accommodates a transparent or diffused plastic sheet for light diffusion.

1.3 Install the LED Strip
- Identify the cut markings on the LED strip and trim 150mm (approximately 3 sections).
- Remove the backing tape and carefully slide the strip into the bottom channel.
- Avoid pressing down immediately to prevent premature adhesion. Once positioned, press firmly to secure the strip.

1.4 Install the Diffuser
- Cut a 150mm x 10mm diffuser or transparent plastic sheet.
- Slide it into the upper channel of the LED enclosure.

1.5 Wiring & Mounting
- Solder the connecting wires to the LED strip and route them through the designated holes. Do not attach the JST connectors yet.
- Mark the mounting positions on the trim and drill small holes for the screws and wiring.
- Fish the wiring through the trim and securely mount the LED profile using small, thin screws.
- Snap the side covers into place.

1.6 Final Wiring
- Once the wiring is routed inside the trim, solder the JST connector and insulate joints using electrical tape or heat shrink tubing. Use zip ties or hot glue to secure the wire in place.

Step 2: Connect the Power

2.1 Tap Into the Side Cargo Light
- Carefully pry open the side cargo light using a nylon pry tool.
- Disconnect the power cable.

2.2 Solder Connections
- Solder the LED wiring onto the side cargo light metal contacts to draw power as shown in attached picture.
- The side cargo light’s built-in switch will control both lights.

2.3 Route the Wiring
- Pry open the left side trim and route the wiring up to the overhead LED fixture.
- Connect the JST connector, ensuring no wires obstruct the retaining clips.

2.4 Secure the Trim
- Gently but firmly push the trims back into place.

Tips & Recommendations:
- Material Choice: Print in PETG or ABS to prevent softening in high temperatures inside car.
- Color Matching: Use light grey filament for a seamless integration with the vehicle’s trim.
- Securing Side Covers: Apply a small amount of CA glue post-installation to prevent vibration-related dislodging.
- Adjusting Dimensions: Need a longer or shorter fixture? Scale only along the length in your slicer, leaving the width and height unchanged.