Toyota 4Runner Amp and Sub Installation

Enhance your vehicle’s stock audio system by starting with two pieces that can completely change your vehicle’s sound: the amplifier and subwoofer. If you’re looking for a walkthrough on how to complete a Toyota 4Runner amp and sub installation at home, look to our experts at Trail Grid Pro. They’ll provide a step-by-step guide to installing these audio-enhancing parts. For more information and a visual guide to completing this installation, check out our Toyota 4Runner amp and sub installation tutorial video.

Tools and Parts Needed for Amp and Sub Installation

  • Ratchet
  • 10, 12, 14mm sockets
  • Panel tool/pry tool
  • Utility knife
  • 3mm Allen wrench (provided)
  • Cutters
  • Phillips head screwdriver
  • Zip ties

How To Install the Kicker Sub and Amp

Step 1: Disassemble the console to gain access to the back of the radio (check out our disassembly videos for detailed instructions).

Step 2: Adjust the passenger seat. Pop out the four plastic covers and corresponding seat bolts. Lean the seat back into the rear vehicle seats.

Step 3: Remove the kick panels by releasing the clips to gain access to the wiring. Use the panel tool to release the clips.

Step 4: Connect the RCA cables, T-harness, and remote turn-on wire to your aftermarket radio head unit. String one end of both the included RCA cables and T-harness through the dash and down to the passenger side.

Step 5: Put the radio unit back in place in the dash with the new wiring connections.

Step 6: Tuck the wires you ran along the passenger side behind the carpet and connectors by the passenger kick panel.

Step 7: Place the amplifier on the passenger side floor.

Step 8: Route the power wire from the positive battery terminal in the engine compartment. Connect to the fuse block, sticking the inline fuse on top of the panel. Use zip-ties to run the power wires along the fire wall to keep them away from heated engine parts.

Step 9: Cut in an “x” motion with a utility knife through the grommet to run the power wire through.

Step 10: Finish running the power wire along the same wiring you’ve put in place to connect to the amplifier.

Step 11: Run the ground wire for the amplifier through the hole in the floor pan.

Step 12: Run forked wire ends to the amplifier and the pointed ends to your subwoofer.

Step 13: Connect each wire you’ve run through the vehicle to the amplifier.

Step 14: Run the subwoofer-connecting wires under the carpet along the back door, removing the plastic kick cover. Follow the plastic behind and around the back seat.

Step 15: Replace plastic kick panels along the doors and underneath the passenger dashboard.

Step 16: Connect the subwoofer connection wires that you ran along the back seats to the subwoofer unit.

Step 17: Attach the power wire to the battery terminal in the hood compartment.

Step 18: Turn on your 4Runner, and test the connected amplifier and subwoofer.

Step 19: Fine-tune and tweak the amplifier settings to your preferences. Reassemble the passenger seat and radio console.