The 4th Brake Light Kit for the 2022–2025 Subaru WRX adds a high-intensity center-mounted brake light to improve rear visibility and safety. This is a bolt-on install that integrates cleanly into the lower rear bumper. Here's the full walkthrough.
Table of Contents
- Tools Required
- Installation Instructions
- Questions About the Install?
- Shop WRX 4th Brake Light Kit at Ess K Customs
Tools Required
- 10mm socket
- 8mm socket
- Phillips screwdriver
- T25 Torx screwdriver
- Plastic trim removal tool
Installation Instructions
Step 1 — Remove the plastic push clip securing the taillight trim using a Phillips screwdriver.
Step 2 — Use a plastic trim tool to carefully remove the taillight trim panel.
Step 3 — Remove the two 10mm bolts securing the taillight assembly.
Step 4 — Carefully pull the taillight away from the vehicle.
Step 5 — Disconnect the factory taillight connector and set the taillight aside.
Step 6 — Connect the supplied inline harness to the vehicle-side taillight connector.
Step 7 — Feed the harness connector down through the factory opening behind the bumper.
Step 8 — Reconnect the taillight to the inline harness.
Step 9 — Reinstall the taillight assembly and secure it with the two factory 10mm bolts.
Step 10 — Reinstall the taillight trim panel.
Step 11 — Using a trim tool, remove the rectangular cover from the center of the rear bumper.
Step 12 — Remove the two plastic push clips from the underside of the bumper on each side.
Step 13 (Optional) — Leave the purple wire connected to enable brake light strobing. To disable the strobe, disconnect and install the safety strobe module.
Step 14 — Plug the safety strobe module into the harness connector.
Step 15 — Route the wiring and connector into the center bumper cavity.
Step 16 — Slide the provided clip nuts onto the brake light mounting bracket.
Step 17 — Insert the brake light into the bracket and secure it using the supplied screws.
Step 18 — Connect the safety strobe module to the brake light.
Step 19 — Carefully push the brake light assembly into the bumper opening.
Step 20 — From behind the bumper, position the support bracket against the brake light bezel.
Step 21 — Secure the brake light and bracket using the supplied bolts and fasteners.
Step 22 — Zip tie any loose wiring to prevent movement or rattling.
Step 23 — Reinstall all plastic push clips removed from the underside of the bumper. The install is complete.
Questions About the Install?
If you run into any issues during the installation, contact Ess K Customs — as an authorized Diode Dynamics dealer, we're here to help.
Shop WRX 4th Brake Light Kit at Ess K Customs
Ready to add a 4th brake light to your WRX? As an authorized Diode Dynamics dealer, Ess K Customs carries genuine products with full manufacturer warranty.
Shop 2022-2025 Subaru WRX 4th Brake Light Kit →
This install guide applies to Diode Dynamics SKU: DD8067