Welcome to the installation guide for your 2014-2021 Tundra AudX Plug & Play 5-Channel Amp & Subwoofer Kit from Trail Grid Pro! This step-by-step guide is designed to make the installation process as smooth as possible, whether you're a seasoned DIYer or tackling your first head unit upgrade.
In this guide, you’ll find:
- 📢 Important Updates: The written guide includes the latest updates and adjustments that may not be shown in the video, ensuring you have the most up-to-date instructions for a flawless installation.
- 🎥 Installation Videos: Visual instructions to help you through the process, including a detailed microphone install.
- 🛠️ Parts Included and Tools Needed: A quick list of everything you'll need to get started.
- 📝Step-by-Step Instructions: Clear, easy-to-follow directions from disassembling your dash to securing the new Sony head unit.
- ⚠️ Special Notes: Important information and considerations for your installation.
- 🛠️ Common Troubleshooting Solutions: Quick and effective fixes for common installation and performance issues.
Table of Contents
- Important Updates
- Installation Video
- Tools Needed
- Step 1: Disassemble Your Dash
- Step 2: Connect the Amplifier Bypass (Amplified Non-JBL Only)
- Step 3: Route the Power Wire
- Step 4: Route the Main Harness
- Step 5: Connect Your Head Unit
- Step 6: Reinstall Your Head Unit
- Step 7: Connect the Ground Wire
- Step 8: Connect the Bass Control Knob
- Step 9: Secure the Amplifier to the Bracket
- Step 10: Connect the Amplifier
- Step 11: Route the Subwoofer Wire
- Step 12: Connect Power to the Battery
- Step 13: Test & Tune the System
- Step 14: Reassembly
🎥Installation Video
Coming Soon!
🛠️Parts Included:
- AudX EZV1K 5-Channel Amplifier
- AudX Tundra Amplifier Mounting Bracket
- AudX T-Harness
- AudX Main harness
- Amplifier Bypass Harness (Amplified Non-JBL Vehicles Only)
- RCA adapters
- Trail Grid Pro Amplifier Install Kit
- 10 Zip Ties
- 10mm Ground Bolt
🛠️Tools Needed:
- Panel removal tool
- 10 mm socket
- 12 mm socket
- 14 mm socket
- Ratchet wrench
- Socket extension
- Phillips head screwdriver
- Zip ties
- Razor knife
- Wire fish
Step 1: Disassemble Your Tundra
- Dash & Head Unit
- Remove the lower dash panel containing the USB ports.
- Use a panel tool between this panel and the HVAC panel, then pull straight back to release the retaining clips.
- Pull the HVAC panel straight out by hand and disconnect the plug from the back.
- Remove the four 10mm bolts securing the head unit, then pull straight back to release the clips.
- Disconnect all wiring connections from the rear of the head unit.
- Center Console
- Twist the gear shifter handle counterclockwise to remove it.
- Open the center console, then lift up the shifter panel to release it.
- Disconnect any connectors before fully removing the panel.
- Passenger Seat
- Remove the two 14mm front seat bolts.
- Slide the seat forward, remove the plastic trim covering the rear bolts, then remove the rear 14mm bolts.
- Slide the seat back, lift, and either lean it back for access or disconnect the plugs and remove it completely.
Factory Non-JBL Amplifier (if equipped)
- Remove the three plastic pins securing the amplifier cover.
- Remove the cover and disconnect all three plugs from the amp.
Step 2: Connect the Amplifier Bypass Harness (Amplified Non-JBL Vehicles Only)
- The bypass harness has two plugs:
- One 10 pin connector.
- One 12 pin connector.
- Match the appropriate connectors to the factory plugs and connect.
Step 3: Route the Power Wire
- Remove the Passenger Front Door Kick Panel Trim:
- Remove screw on knob securing panel to floor.
- Pull the panel to the left to remove the retainers.
- Remove the Passenger Door Sill:
- Using a panel tool or your fingers gently pry the floor trim up until free.
- Lift and remove from vehicle.
- Prepare the Power Wire:
- Open the hood and secure it in place.
- Locate the power wire with the inline fuse included in your kit.
- Connect the short power wire to one side of the inline fuse by securing the wire ferrule using an allen key.
- Connect one end of the longer power wire to the other side of the inline fuse the same way.
- Route the Power Wire:
- Place the ring terminal near the positive battery terminal (do not connect it yet).
- Route the power wire along the driver’s side fender, across the firewall, and toward the passenger-side firewall grommet.
- Pass Through the Firewall:
- Use a utility knife to carefully cut an "X" in the firewall grommet to allow the power wire to pass through.
⚠️ Note: Many Toyota firewall grommets have both an exterior and interior membrane—cut through both.
⚠️ Be careful not to damage any vehicle wiring while cutting.
- Use a wire fish tool if necessary to guide the ferrule end of the power wire into the cab.
- Once the wire is through the firewall, pull the slack into the passenger-side floorboard.
- Use a utility knife to carefully cut an "X" in the firewall grommet to allow the power wire to pass through.
- Run the Power Wire to the Amplifier:
- Route the wire down the passenger-side kick panel and through the factory wire channel.
- Run the wire under the carpet to the power side of the amplifier.
- Use the provided zip ties to secure any loose wiring in the engine bay.
Step 4: Route the Main Harness
- Route the Main Harness:
- Position the main harness under the front passenger seat.
- Start with the T-harness end and begin routing it toward the head unit.
- Run the harness under the carpet, directing it toward the gear shifter.
- Continue routing the harness through the transmission tunnel area, moving toward the front of the vehicle.
- Guide the T-harness up inside the dash, routing it towards the main radio connections.
Step 5: Connect your Head Unit
For 2014–2019 Models
Factory Head Unit:
- Disconnect the 10-pin and 6-pin and from the back of the head unit.
- Plug the male end of the AudX T-Harness into the 10-pin and 6-pin ports on the head unit.
- Attach the vehicle’s 10-pin and 6-pin connectors to the female end of the AudX T-Harness.
- ⚠️ (Optional) If grounding the harness, secure the black wire with the small ring terminal to a clean metal-to-metal ground location.
Aftermarket Head Unit:
- Disconnect the 10-pin and 6-pin connectors from the back of the head unit.
- Connect the male end of the AudX T-Harness to the 10-pin and 6-pin ports on the head unit.
- Attach the vehicle’s 10-pin and 6-pin connectors to the female end of the AudX T-Harness.
- Connect RCA cables to the RCA outputs on the aftermarket radio.
For 2020–2021 Models
Factory Head Unit:
- Disconnect the 10-pin and AM/FM antenna connector from the back of the head unit.
- Connect the male end of the AudX T-Harness to the 10-pin and AM/FM antenna port on the head unit.
- Attach the vehicle’s 10-pin and AM/FM antenna connector to the female end of the AudX T-Harness.
Aftermarket Head Unit:
- Disconnect the 10-pin and AM/FM antenna connector from the back of the head unit.
- Connect the male end of the AudX T-Harness to the 10-pin and AM/FM antenna location on the head unit.
- Attach the vehicle’s 10-pin and AM/FM antenna connector to the female end of the AudX T-Harness.
- Connect RCA cables to the RCA outputs on the aftermarket radio:
- Front Speakers:
White → White
Grey → Red - Rear Speakers:
Green → White
Purple → Red - Subwoofer:
Orange → White
Brown → Red
- Front Speakers:
⚠️ (Optional) For either factory or aftermarket head unit installations, if grounding the harness, secure the black wire with the small ring terminal to a clean metal-to-metal ground location.
Step 6: Reinstall Your Head Unit
- Reconnect and Reposition:
- Ensure that all previously disconnected wiring connections are securely reattached.
- Carefully position the head unit back into the dash.
- Fasten the head unit using the four factory 10 mm bolts.
⚠️ Important: Do not fully reassemble the dash at this point—functionality should be tested before completing the installation.
Step 7: Connect the Ground Wire
- Secure the Ground Connection:
- Use the provided ground wire to connect the ring terminal to the factory ground point located under the passenger seat.
- If a factory ground bolt is not present, use the included bolt to secure the ring terminal to the pre-threaded hole under the seat.
Step 8: Connect the Bass Control Knob
- Mount and Connect the Bass Knob:
- Attach the bass control knob in your preferred location using the included Velcro, or install it into one of our Switch Blank Mounts.
- Route the control knob wire from the main harness and plug the 3.5mm headphone jack into the bass control knob.
- Use zip ties to secure any excess or loose wiring.
Step 9: Secure the Amplifier to the Bracket
- Install the Amplifier:
- Place the amplifier mounting bracket with the AudX label facing up.
- Align the amplifier with the pre-drilled holes on the mounting bracket, orienting it so the ports face the driver side of the vehicle.
- Insert one bolt up through the bottom of the amplifier mounting bracket, then through the amplifier’s mounting hole.
- Place a flat washer, followed by a split washer, and secure it with a nut.
- Use a 9/32" wrench and a Phillips head screwdriver to tighten the hardware.
⚠️ Do not overtighten. - Mount the amplifier bracket to the floor pan using the factory hardware by securing the 10mm bolts back to the factory locations.
Step 10: Connect the Amplifier
- Connect main harness to amplifier:
- Connect 14 pin connector into "Input" port
- Connect 4 pin connector into "REM" port
- Connect 8 pin connector into "Output" port
- Connect subwoofer wires into "Woofer"
- Red → +
- Black → -
- Secure using the provided allen wrench
- Connect red power wire into "DC12V"
- Secure wire ferrule using the provided allen wrench
- Connect the black ground wire into " GND"
- Secure wire ferrule using the provided allen wrench
Step 11: Route the Subwoofer Wire
- Route the wire to behind the rear seat:
- Remove the rear door sill by pulling straight up.
- Route the subwoofer wire through the factory wiring channel toward the rear seat.
- Press the subwoofer wire under the interior plastic panels and continue routing it to the rear seat.
- Connect to the Subwoofer:
- Connect the yellow wire to the positive (+) terminal.
- Connect the black wire to the negative (–) terminal.
Step 12: Connect Power to the Battery
- Connect the Power Wire:
- Locate the short length of power wire with the pre-connected ring terminal.
- Connect the ring terminal securely to the positive battery terminal.
Step 13: Test & Tune the System
- Power on your vehicle and test the audio system.
- Confirm that both the radio and amplifier are functioning properly.
- Adjust and tune the amplifier settings to achieve optimal sound quality.
🛠️Troubleshooting Tip:
If the head unit powers on but you hear no sound, double-check that the remote turn-on wire is properly connected.
Step 14: Reassembly
- Reinstall the Passenger Seat:
- After confirming the system is functioning properly and the amplifier gains are set, begin reassembly.
- Position the passenger seat back into place, making sure the rear seat mounts are aligned.
- Start all four 14mm seat bolts by hand, then tighten them securely with a 14mm socket.
- Complete Vehicle Reassembly:
- Reinstall all remaining components, including the passenger seat trim, center console, and dash panels.
