Here is a simple and easy breakdown of how to install your new
Alpine 4 Channel Amplifier and Powered Subwoofer Plug & Play Bundle
from Alpine and Trail Grid Pro!
Note: This kit is NOT compatible with Factory JBL amplified systems.
Installation Video
Coming Soon!
Parts Included:
- Amplifier assembly:
- Vehicle specific mounting bracket
- Alpine PWE-S8 powered subwoofer
- Alpine KTP-445U 4 channel amplifier
- T-Harness
- Main harness
- Amplified Non-JBL Bypass Harness (For Tundra's equipped with the non-branded amplifier)
- 4x RCA adapters
- Power Cable
- 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
Removing your radio:
- Remove the lower dash panel containing the USB ports
- Use a panel removal tool and insert in the gap between that panel and the HVAC panel. Once it is loose pull straight back towards you to release the retaining clips.
- Remove the HVAC panel by pulling straight out with your hands.
- Disconnect the one plug from the back of the HVAC control panel.
- Remove the factory head unit:
- Use a 10mm socket and extension to remove the four 10mm bolts that secure the bottom of the radio. Place in the cup holder for safe keeping.
- Remove the head unit by pulling straight back towards you with your hands to release the upper retaining clips.
- Disconnect all of the connections from the back of the radio. Depress the tabs on each connection to remove the plugs.
Step 2
Remove the center console:
- Remove the gear shifter handle by twisting counter clockwise.
- Open the center console.
- Lift up on the shifter panel to remove.
- Disconnect any wire connections before fully removing.
- Pull straight out to release the retaining tabs.
- Disconnect any connectors before fully removing.
Step 3
Remove the passenger front seat:
- Remove the plastic covers from the front seat bolt brackets.
- Remove the front seat bolts using a 14mm socket.
- Move the seat to the forward position.
- Remove the plastic covers from the rear of the front seat brackets.
- Remove the front seat bolts using a 14mm socket.
- Move the seat back to the middle position and lean the seat back to access the bottom.
- Remove the connectors by depressing the tabs.
- Remove the seat from the vehicle.
Step 4
Routing the power wire:
If your truck is non-amplified use the following instructions:
- Remove the passenger front door sill plate by lifting straight up.
- Remove the plastic nut holding on the passenger side kick panel.
- Remove the kick panel by pulling out.
- Remove the panel under the dash.
- Provided in the kit is a spyder wrapped power wire with inline fuse.
- Open and secure the hood.
- Start with the ring terminal near the positive battery terminal.
- Route the power wire along the drivers side fender, across the firewall and towards the passenger side firewall grommet.
- Locate a spot to cut an "X" in the grommet using a utility knife. Keep in mind that many Toyota firewall grommets have an exterior and interior membrane that you will need to cut through. Take extra care to not damage any other vehicle wiring when cutting your "X."
- You may choose to use a wire fish to help with passing the blue bullet connector end of the power wire into the cab of the vehicle.
- Once the power wire is through the firewall, pull the slack into the passenger floor board.
- Secure any loose wire in the engine bay using the provided zip ties.
Step 5
Routing the main harness:
- Start with the main harness in the area under the front passenger seat.
- Begin with the T-harness end of the main harness and route it towards the head unit.
- Begin by going under the carpet directly towards the gear shifter.
- Once you are into the transmission tunnel area continue towards the front of the vehicle.
- At this point, you will want to remove the radio fully to gain access to the connections.
- Continue running the T-Harness up the inside of the dash and towards the main radio connections.
Step 6
Making connections to your 2014-2019 head unit:
- Factory Head Unit:
- Disconnect the 10 pin & 6 pin connector from the back of the head unit.
- Connect male end of the Alpine T-Harness to 10 pin & 6 pin locations in the back of head unit.
- Connect 10 pin & 6 pin connectors from vehicle to female end of the Alpine T-Harness.
- Aftermarket Head Unit:
- Disconnect the 10 pin & 6 pin connector from the back of the head unit.
- Connect male end of the Alpine T-Harness to 10 pin & 6 pin locations in the back of head unit.
- Connect 10 pin & 6 pin connectors from vehicle to female end of the Alpine T-Harness.
- Connect RCA's to RCA outputs from aftermarket radio:
- Front
- White to White
- Grey to Red
- Rear
- Green to White
- Purple to Red
- Sub
- White to White
- Red to Red
Making connections to your 2020-2021 head unit:
- Factory Head Unit:
- Disconnect the 10 pin connector from the back of the head unit.
- Connect male end of the Alpine T-Harness to 10 pin location in the back of head unit.
- Connect 10 pin connector from vehicle to female end of the Alpine T-Harness.
- Aftermarket Head Unit:
- Disconnect the 10 pin connector from the back of the head unit.
- Connect male end of the Alpine T-Harness to 10 pin location in the back of head unit.
- Connect 10 pin connectors from vehicle to female end of the Alpine T-Harness.
- Use provided bullet connectors to connect remote turn on wire (Blue with White Stripe) to your aftermarket head unit.
- Connect RCA's to RCA outputs from aftermarket radio:
- Front
- White to White
- Grey to Red
- Rear
- Green to White
- Purple to Red
- Sub
- White to White
- Red to Red
Replace your radio into the dash:
- Now that your main wiring harness is connected, make sure that any other connections that may have been removed are reconnected.
- Place your head unit back into the dash and secure with the four factory 10 mm bolts.
- Do not completely reassemble your dash at this time. We will want to test functionality before completely putting the truck back together.
Step 8
Connecting the ground wire:
- Using the provided Alpine ground wire, attach the ring terminal to the factory ground under the passenger seat.
- If not factory ground bolt is present, use the provided bolt to secure the ring terminal from the ground wire to the pre-thread hole under the passenger seat.
Step 9
Routing the Alpine bass control knob:
- If you are using the PSU kit with a factory head unit and would like to control the bass, you will need to place and connect the provided control knob.
- Use the provided velcro to place the bass control knob in your desired location.
- Route the wire to the subwoofer/amplifier assembly and connect the 3.5mm headphone jack into the subwoofer.
- Secure any extra or loose wire with zip ties as needed.
Step 10
Placing the subwoofer/amplifier assembly in the vehicle:
- Place the subwoofer/amplifier assembly on the floor under the front passenger:
- The angled end of the brackets will go towards the front of the vehicle.
- When properly placed, the holes in the legs of the bracket will line up with the factory seat bolts and locating pins from the seat.
- Make the connections from the Alpine main harness to the subwoofer and amplifier:
Non amplified Tundra:
- Connect the White 14 pin connector to subwoofer.
- Connect the RCA's from the main harness to subwoofer:
- Red to Red
- White to White
- Connect the Black 16 pin connector to amplifier.
- Connect the Black 10 pin connector to amplifier.
- If you ran the power wire to the battery, connect the bullet connector from the power wire that you ran from the battery earlier and connect to the yellow wire from the main harness.
Amplified Non-JBL Tundra:
- Connect the White 14 pin connector to subwoofer.
- Connect the RCA's from the main harness to subwoofer:
- Red to Red
- White to White
- Connect the Black 16 pin connector to amplifier.
- Connect the Black 10 pin connector to amplifier.
- Connect the bullet connector from the bypass harness to the yellow wire from the Alpine main harness.
- Connect the 12 pin connector from the bypass harness to the 12 pin connector that was removed from the factory amplifier.
- Connect the 10 pin connector from the bypass harness to the 12 pin connector that was removed from the factory amplifier.
- Use the provided zip ties to secure any extra or loose wires.
Step 11
Connect the power wire to the battery:
- Use a 10mm or 12mm wrench to remove the nut from the positive battery terminal.
- Place the ring terminal from the Alpine power wire on the positive terminal and secure with factory nut.
- It is completely normal to get a small spark when placing the ring terminal on the battery.
Step 12
Test your system functionality:
- Power on your vehicle and test functionality.
- Find a song that will play continuously for a few minutes:
- Check Balance/Fade setting to ensure all speakers are playing appropriately
- Below is the recommended amplifier setting for use with a Factory Head Unit:
- Below is the recommended amplifier setting for use with an Aftermarket Head Unit:
Once you have confirmed that your system is working and you have set the gains to your liking, reassemble your vehicle and enjoy your new amplified system!
Step 13
Replacing the front passenger seat:
- Once you are satisfied with the setting of your amplifier and subwoofer it is time to replace the front seat.
- Make sure all loose wires are secured and that the brackets on the subwoofer/amplifier assembly are lined up with the mounting holes in the floorboard.
- Gently place the seat into position.
- Replace any wiring harnesses that were disconnected during disassembly.
- Start the four 14mm bolts that secure the seat by hand.
- Use a 14mm socket to fully tighten the seat bolts.
- Replace the plastic covers over the seat bolts.
Step 14
Replacing trims panels and center console:
- Replace the kicker panel at the bottom of the A pillar and secure the plastic retention nut.
- Replace the door sill panel.
- Replace the plastic trim panel below the glove box.
- Replace the panel under the dash.
- Reconnect any wiring connector to the center console trim.
- Place the console trim into place and press to secure.
- Replace the lower trim panel containing the 12V outlet and USB.
- Secure with two 10mm bolts.
Step 15
Replace the radio and center dash trim:
- Fully tighten the four 10mm bolts securing the head unit.
- Reconnect the wiring connector to the HVAC panel and press into place.
- Replace center console and reinstall shift knob.
