Amplified Non-JBL Bypass with Kicker 5 Channel Amplifier Install Guide | 2014 - 2021 Tundra

Welcome to the installation guide for your Amplified Non-JBL Bypass Plug & Play Bundle with Kicker 5 Channel Amplifier for the 2014–2021 Toyota Tundra from Trail Grid Pro! This guide walks through removing the factory non-JBL amplifier beneath the passenger seat, connecting the bypass harness, and wiring the Kicker 660.5 to your aftermarket radio. Read through the guide before starting.

Table of Contents

• Important Notes Before You Begin
• Installation Video
• Parts Included
• Tools Needed
• Step 1: Access the Area Under the Passenger Seat
• Step 2: Remove the Factory Non-JBL Amplifier
• Step 3: Connect the Non-JBL Bypass Harness
• Step 4: Remove the Door-Sill and Kick-Panel Trim
• Step 5: Connect the Radio Wiring
• Step 6: Route the RCA and Remote Leads
• Step 7: Route the Power Cable
• Step 8: Connect the Ground Wire
• Step 9: Connect the Amplifier and Optional Subwoofer
• Step 10: Inspect the Wiring and Finish the Power Connection
• Step 11: Test the System
• Step 12: Set the Amplifier Controls
• Step 13: Reassemble and Complete the Final Checks
• Common Troubleshooting Solutions
• Contact Us

📢 Important Notes Before You Begin

This is the amplified non-JBL installation: Use the non-JBL bypass harness supplied for your truck, not the JBL harness instructions. These steps describe an aftermarket radio and Kicker 660.5. If your connectors or equipment differ, contact us before modifying anything.

2014–2019 radio-side wiring: These trucks use the supplemental 10-pin harness described in Step 5. The radio-side 6-pin rear-speaker connector is disconnected and left unused for that configuration. Do not apply this instruction to a different configuration.

Optional aftermarket subwoofer: This guide uses yellow for subwoofer positive and black for subwoofer negative. Do not use the red/orange factory-subwoofer wire pairings from the JBL guides.

🎥 Installation Video

Use the non-JBL written harness instructions below for this installation. If the video and your supplied harness differ, stop and contact us before making connections.

Parts Included

• One Kicker 660.5 5-channel amplifier
• One plug-and-play amplified non-JBL bypass harness
• One supplemental bypass harness, 2014–2019 only
• Three pre-bundled 3-meter, 2-channel RCA cables with blue remote wire
• One RCA splitter with double female adapters
• Red power wire
• Kicker inline fuse block
• Black ground wire
• Four pieces of Velcro
• One male and one female bullet connector
• One supplied 10mm-head bolt

Check for shipping damage and missing parts before starting. If connecting an aftermarket subwoofer, also locate the black/yellow speaker-wire pair referenced in Step 9. Contact us if required parts are missing.

🛠️ Tools Needed

• 10mm socket and compatible ratchet
• 12mm wrench or socket for the battery-terminal hardware described in this kit
• 14mm wrench or socket for the passenger-seat bolts
• 3mm Allen wrench for amplifier and fuse-holder connections
• Panel removal tool, preferably plastic
• Phillips-head and small flat-head screwdrivers
• Utility knife
• Wire fish or suitable protected wire-pulling tool
• Electrical tape
• Side cutters
• Zip ties
• Appropriate crimping tool for the supplied bullet connectors
• Torque wrench for reinstalling the seat to Toyota’s specification

📝 Step-by-Step Instructions

Step 1: Access the Area Under the Passenger Seat

Complete the battery and seat-safety preparations above first.

1. Remove the two front 14mm-head passenger-seat mounting bolts.
2. Slide the seat forward to reach its rear mounting points.
3. Gently lift and pull back the two plastic covers over the rear bolts.
4. Remove the two rear 14mm-head bolts and keep all four seat bolts together.
5. Move the seat back and carefully tilt it to reach the amplifier. Support the seat without pulling on its wiring.
6. If more room is needed, follow Toyota’s service procedure to disconnect the seat plugs, up to three in this installation, and lift the seat out with assistance.

Do not switch the vehicle on with seat connectors disconnected. Stop if the seat cannot be supported without stretching its wiring.

Step 2: Remove the Factory Non-JBL Amplifier

1. Use a panel tool to release the three black plastic retaining pins from the amplifier cover.
2. Lift off the black plastic cover.
3. Press the release tabs and unplug the three connectors from the side of the amplifier. Pull on the plug bodies, not the wires.
4. Lift the carpet flap to expose the mounting bracket.
5. Support the amplifier while removing its three 10mm-head mounting bolts.
6. Lift the amplifier out and save its cover and hardware.

Step 3: Connect the Non-JBL Bypass Harness

1. Locate the supplied non-JBL bypass harness’s 10-pin and 12-pin connectors.
2. Match them to the corresponding factory plugs removed from the amplifier.
3. Push each matching connection together until fully seated. Do not force mismatched plugs.

Step 4: Remove the Door-Sill and Kick-Panel Trim

The kick panel is beside the passenger’s feet. The door sill is the trim along the bottom of the doorway.

1. Unscrew the retaining knob securing the passenger-side kick panel.
2. Pull the panel to the left, toward the footwell, to release its retainers.
3. Set the panel and knob aside.
4. Use a panel tool or your fingers to gently lift the door-sill trim until its clips release.
5. Lift the trim out and set it aside.

Step 5: Connect the Radio Wiring

Access the back of the aftermarket radio using the vehicle- and radio-specific removal instructions. Support it rather than letting it hang by its wiring. RCA cables carry the audio signal; the blue remote wire tells the amplifier when to switch on.

1. Connect FL and FR to the radio’s front-left and front-right RCA outputs.
2. Connect RL and RR to its rear-left and rear-right outputs.
3. Connect SL and SR to its subwoofer outputs for the subwoofer arrangement described in this guide.
4. If the radio has only one subwoofer RCA output, attach the supplied Y-splitter, then connect both subwoofer RCA leads using the supplied adapters as needed.
5. Use the supplied bullet connectors and a suitable crimping tool to connect the blue remote wire to the radio’s amplifier-turn-on lead.
6. Check that the remote connection is secure and insulated.

Additional connections for 2014–2019 Tundras only:

1. Locate the supplied supplemental 10-pin power harness.
2. Connect its female end to the vehicle’s 10-pin power connector coming from the dash.
3. Connect its male end to the matching 10-pin connector on the aftermarket radio harness.
4. Disconnect the radio-side 6-pin rear-speaker connector and leave it disconnected for this configuration.

⚠️ Important: Use the matching year-specific harness.
The supplemental-harness and disconnected 6-pin instructions above apply to the 2014–2019 configuration in this guide. They are not instructions to unplug the rear-speaker wiring on every Tundra. If your 2020–2021 harness or supplied parts are unclear, contact us before changing connections.

Step 6: Route the RCA and Remote Leads

1. Route the bundle down the passenger side of the dash toward the footwell.
2. Continue behind the upper edge of the carpet toward the bottom of the windshield-pillar area.
3. Open the factory wiring-channel covers by releasing their tabs with a small flat-head screwdriver.
4. Follow the channel toward the area under the passenger seat.
5. Pass the cables beneath the carpet and through the existing opening near the floor vents.
6. Keep them clear of the vents, seat tracks, and mounting holes.

Step 7: Route the Power Cable

Keep the battery end disconnected and the inline fuse removed throughout this step.

1. Plan the fuse-block position using the amplifier and wiring-kit requirements.
2. Connect the short shielded power-cable section to one side of the fuse block.
3. Connect the long shielded section to the other side.
4. Seat each protective grommet in its groove and tighten the connections with the appropriate Allen wrench.
5. Fit the Kicker fuse-block cover.
6. Route the long cable along the inside of the driver-side fender toward the firewall, then across to the passenger-side firewall grommet, as described for this installation.
7. Secure it away from heat, sharp edges, and moving components.
8. Inspect both sides of the firewall grommet and identify a clear rubber area away from factory wiring.
9. If an opening is needed, carefully make a small X only in that clear area. Some Toyota grommets have inner and outer membranes.
10. Use a protected wire-pulling tool to guide the cable through without damaging the grommet or existing wiring.
11. Route it behind the kick panel, through the factory wiring channel, and beneath the carpet to the amplifier.
12. Connect it to the amplifier’s labeled positive power terminal and secure it according to the amplifier manual.

⚠️ Important: Never cut blindly into a firewall grommet.
If you cannot see and protect the wiring on both sides, stop and use a qualified installer. Protect the cable from metal edges and maintain the grommet’s protective seal. Do not connect the cable to the battery yet.

Step 8: Connect the Ground Wire

1. Connect the supplied black ground wire to the amplifier’s labeled ground terminal.
2. Secure it with the appropriate Allen wrench.
3. Route it beneath the carpet to the intended factory ground location under the seat.
4. Attach it using the supplied 10mm-head bolt.
5. Check that the connection is secure and the wire cannot catch in the seat tracks.

If you cannot identify the intended ground location, contact us rather than choosing an arbitrary seat or trim bolt.

Step 9: Connect the Amplifier and Optional Subwoofer

1. Position the Kicker 660.5 beneath the passenger seat.
2. Check seat-track and floor-vent clearance and allow the ventilation space required by the amplifier manual.
3. Plan to secure it using the supplied Velcro or suitable mounting brackets, but complete the wiring before permanent mounting.
4. Connect the RCA leads by the labels below.
5. Connect the blue remote wire to the terminal labeled REM.

RCA input connections:

• Amp 1 L: FL, gray
• Amp 1 R: FR, blue
• Amp 2 L: RL, gray
• Amp 2 R: RR, blue
• Sub L: SL, gray
• Sub R: SR, blue

Use the printed channel and left/right labels rather than relying on color alone.

Speaker outputs from the non-JBL bypass harness:

Match each wire to the amplifier’s printed output label. Place its fork terminal, the U-shaped metal connector, under the clamping plate and tighten the terminal screw securely. Check that no exposed strands or connectors touch adjacent terminals.

Rear speakers, Amp 2, bottom row in this installation:

• Left positive (+): green
• Left negative (−): green with black stripe
• Right positive (+): purple
• Right negative (−): purple with black stripe

Front speakers, Amp 1, top row in this installation:

• Left positive (+): white
• Left negative (−): white with black stripe
• Right positive (+): gray
• Right negative (−): gray with black stripe

If connecting an aftermarket subwoofer:

1. Confirm the enclosure’s wiring and load are suitable for the amplifier according to their manuals.
2. Connect the yellow speaker wire to the labeled subwoofer positive (+) output and the enclosure’s positive terminal.
3. Connect the black speaker wire to the labeled subwoofer negative (−) output and the enclosure’s negative terminal.
4. Secure the cable away from moving parts and check that exposed strands cannot touch each other.

If no subwoofer is installed, leave the subwoofer output terminals unused and secure any unused leads so exposed ends cannot contact metal or other wiring.

Step 10: Inspect the Wiring and Finish the Power Connection

1. Inspect every power, ground, remote, RCA, and speaker connection.
2. Check that wiring cannot be pinched by trim, seat tracks, or mounting bolts.
3. Confirm the fuse rating and fuse-holder placement against the amplifier and wiring-kit instructions.
4. With the battery isolated and the inline fuse removed, attach the short power cable’s pre-fitted ring terminal to the positive (+) battery-terminal connection as directed by the vehicle and kit instructions.
5. Secure the amplifier and restore the passenger-seat wiring and mounting before powering the vehicle. Follow Toyota’s service procedure and specified seat-bolt torque.
6. Complete battery reconnection and fuse installation in the order required by the vehicle and amplifier instructions, only after all wiring is finished and checked.

Step 11: Test the System

1. Start with radio volume low and amplifier gains at minimum.
2. Switch on the radio and check that the amplifier powers on.
3. Play a familiar track and check the front speakers, rear speakers, and optional subwoofer.
4. Use balance and fader controls to help check each speaker location.
5. If sound is missing, distorted, or cutting out, stop and troubleshoot before increasing the volume.

Step 12: Set the Amplifier Controls

For the RCA-input arrangement described here, use these starting switch positions:

• Fader: ON
• Input Level: LO
• Sub Input: SUB

1. Follow the Kicker manual’s gain-setting procedure for your radio and amplifier. Gain matches the radio signal to the amplifier; it is not an extra volume control.
2. Choose a familiar track that will play for several minutes.
3. Use a clean, undistorted radio volume for adjustment. The original kit procedure uses about 75% of maximum volume, but not every radio stays clean at that level.
4. Starting at minimum, adjust Amp 1 gain for the front speakers using a small flat-head screwdriver, within the amplifier manual’s limits.
5. Repeat for Amp 2.
6. Adjust the subwoofer gain only if a subwoofer is installed. Otherwise, leave it at minimum.
7. Reduce the gain and radio volume immediately if sound distorts or cuts out. Investigate before continuing.

⚠️ Important: Do not tune through distortion.
Clipping, distortion, or sound that stops can indicate a setup or wiring fault. Lower the volume and gains and inspect the installation. Ask a qualified audio installer if you are unsure how to set gains correctly. Make final radio EQ adjustments only after establishing clean sound.

Step 13: Reassemble and Complete the Final Checks

1. Turn the vehicle and audio system off before finishing trim work.
2. Confirm that the amplifier and any aftermarket subwoofer enclosure are secured and cannot slide during driving.
3. Close the wiring-channel covers without trapping any cables.
4. Refit the passenger kick panel and its retaining knob.
5. Press the door-sill trim back into place.
6. Reinstall the radio and dash trim following the vehicle-specific instructions.
7. Confirm that all four seat bolts were tightened to Toyota’s specification, then refit their covers.
8. Check seat movement and verify that no wire catches or pulls tight.
9. Test the audio again and check for warning lights or other affected functions. If a seat or airbag warning appears, stop and have the system checked.

Keep the removed factory amplifier, cover, and hardware together. Do not refit a cover over the replacement amplifier unless it meets the amplifier’s ventilation and clearance requirements.

Congratulations on installing your Amplified Non-JBL Bypass Harness and Kicker 5 Channel Amplifier!

🛠️ Common Troubleshooting Solutions

The Radio Works, but There Is No Sound

Check whether the amplifier powers on. Before touching wiring, isolate power using the vehicle and amplifier procedures. Inspect the remote lead at the radio and REM terminal, the power and ground connections, the non-JBL bypass plugs, and the RCA input assignments.

Rear Speakers Do Not Work on a 2014–2019 Truck

With power isolated, check the supplemental 10-pin harness connections in Step 5 and the rear speaker outputs on Amp 2. Confirm that you are following the amplified non-JBL configuration. Do not reconnect the unused radio-side 6-pin plug as a trial fix without confirming the harness arrangement with us.

The Aftermarket Subwoofer Does Not Play

Check the radio’s subwoofer-output setting and Sub RCA connections. For this arrangement, confirm Sub Input is set to SUB. With power isolated, check yellow to positive and black to negative at both the amplifier and enclosure. Confirm the enclosure’s wiring matches the amplifier requirements.

Sound Is Distorted or Cuts Out

Lower the volume and gains. With power isolated, inspect for loose terminals, stray strands, damaged wiring, and an insecure ground. Check ventilation and follow the amplifier manual’s protection-indicator guidance. Never fit a higher-rated fuse to hide a fault.

Your Harness Does Not Match

Stop before modifying wiring. Send us your Tundra’s model year, radio and amplifier models, and clear photos of the supplied non-JBL harness and the connection in question.

Contact Us

Need help? Use our contact form and include your Tundra’s model year, radio and amplifier models, whether you have an aftermarket subwoofer, a description of the issue, and clear photos of the relevant wiring.