JBL Amplifier Bypass & Alpine 5 Channel Amplifier Installation Guide | '10-'24 4Runner

Install your JBL amplifier bypass and Alpine 5 channel Amplifier!

• (1) Alpine S2-A55V 5 Channel Amplifier
• (1) Plug and Play Speaker Wire Harness
• (1) 3 Meter 6 Channel RCA cable
• (1) RCA Splitter with double female adapters
• (1) Red Power wire
• (1) In-Line Fuse Block
• (1) Black Ground Wire
• (5) Pieces of Velcro
• (1 each) Male & Female Bullet Connector
• (1) 10mm Bolt

• 10mm socket
• 12mm wrench of socket (Secure power wire to positive (+) battery terminal)
• 14mm wrench or socket (Remove passenger seat bolts)
• 3 mm allen wrench (securing wires to amplifier)
• Panel tool
• Phillips & Flat head screwdriver
• Utility knife
• Wire fish or coat hanger
• Electrical tape
• Side cutters
• Zip Ties

Step 2

Make access to the back of your aftermarket head unit:

• Remove the two side panels by pulling straight back.
• Remove the HVAC control panel by pulling on the knobs straight back and disconnect the one wire harness from the rear. You will also want to remove the white wire retainer from the HVAC panel using a panel removal tool.
• Using a 10mm socket with extension, remove the four 10 mm bolts that hold in the factory radio bracket. Place in your cupholder for safe keeping.
• Remove the factory head unit by grabbing the unit at the top and bottom and pull straight back. 

Step 3

Remove the front passenger seat:

• Remove the plastic covers on the feet of the passenger seat to reveal the four 14 mm bolts.
• There are 2 bolt on the front and 2 bolt on the rear of the seat.
• Remove the four bolts and lean the passenger seat backwards into the back seat to gain access to the area under the seat.
• Disconnect the connectors from the bottom of the seat. 
• Remove the head rest.
• Remove the passenger seat from the vehicle. 

Step 4

Remove the panels:

• Remove the passenger front and rear door sills by pulling straight up.
• Remove the passenger side kick panel from the bottom of the A pillar.
• Remove the button retainer by twisting counter clockwise.
• Pull to remove the kick panel. 

Step 5

Remove the rear cargo cover to access the factory JBL amplifier:

No 3rd Row or No Slide Out Tray:

• Remove the cargo net anchor from the passenger side.
• Turn clockwise and pull out to release.
• Remove the phillips head screw from behind the cargo net anchor.

• Remove screw cover from where the cargo net attaches.

• Remove the screw cover directly below the storage pocket. 

• Remove the 10 mm bolt from the lower cargo anchors.

• Lift the lower portion of the rear passenger seat up to access the lower seatbelt bolt.
• Remove the cover using a pry tool and remove the 14 mm lower seat belt bolt. 

  

• Remove the cover for the recliner handle by sliding towards the inside of the vehicle. 
• Remove the 10 mm bolt behind the recliner handle. 

3rd Row Seat Option:

• Remove carpeted cover to reveal five 10 mm bolts.
• Remove the plastic door sill along the bottom of the rear hatch opening.
• Remove the corner floor covers from the driver and passenger side by lifting up. 
• Remove one 10 mm bolt from the side brackets of the 3rd row seat. 
• There is one 10 mm bolt on each side of the seats. 
• Remove the four 14 mm seat bolts from the rear seat brackets. 
• Remove the plastic seat bracket covers from the front of the 3rd row seats by prying up. 
• Remove the four 14 mm bolts from the front seat brackets.
• Remove the 3rd row seats through the rear hatch opening. 
• Remove the cargo net anchor from the passenger side.
• Turn clockwise and pull out to release.
• Remove the phillips head screw from behind the cargo net anchor.

• Remove screw cover from where the cargo net attaches.

• Remove the screw cover directly below the storage pocket. 

• Remove the 10 mm bolt from the lower cargo anchors.

• Lift the lower portion of the rear passenger seat up to access the lower seatbelt bolt.
• Remove the cover using a pry tool and remove the 14 mm lower seat belt bolt. 

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• Remove the cover for the recliner handle by sliding towards the inside of the vehicle. 
• Remove the 10 mm bolt behind the recliner handle. 

Cargo Slider Tray:

• Open hatch, remove lower plastic trim by pulling up to release clips.  
• Remove two carpeted covers on both left and right sides of slider, using a pry tool, start on the side towards the front of the vehicle and pry straight up to release the clips. 
• Remove four 14 mm bolts on both sides, total of eight. 
• Lift carpeted slider up and out of vehicle.
• Remove the cargo net anchor from the passenger side.
• Turn clockwise and pull out to release.
• Remove the phillips head screw from behind the cargo net anchor.

• Remove screw cover from where the cargo net attaches.

• Remove the screw cover directly below the storage pocket. 

• Remove the 10 mm bolt from the lower cargo anchors.

• Lift the lower portion of the rear passenger seat up to access the lower seatbelt bolt.
• Remove the cover using a pry tool and remove the 14 mm lower seat belt bolt. 

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• Remove the cover for the recliner handle by sliding towards the inside of the vehicle. 
• Remove the 10 mm bolt behind the recliner handle. 

 Step 6

Connecting the JBL Bypass harness:

• Our JBL amplifier bypass has two connectors:
• (1) 10 pin connector
• (1) 12 pin connector
• Remove the 10 and 12 pin connector from the JBL amplifier and match the appropriate plugs to the factory plugs you just removed from your factory amplifier and connect.

Step 7

Routing the JBL bypass harness:

• Route the JBL bypass harness towards front passenger seat.
• Route the wire in the factory wiring channel along the door jamb, making sure to not to impede any factory wiring or bolts.
• Use the factory wiring hold downs to secure the wire or zip ties as needed. 

Step 8

Connecting RCA's/Remote wire to aftermarket radio:

• Connect the provided set of RCA's to the RCA connections for Front, Rear & Sub on the back of your aftermarket head unit.
• The RCA's are labeled:
• Front Left (FL) Clear, Front Right (FR) Red
• Rear Left (RL) Clear , Rear Right (RR) Red
• Sub Left (SL) Clear & Sub Right (SR) Red
• If your aftermarket radio only 1 sub out RCA, use the included Y splitter.
• Connect the Y splitter to the sub out RCA and the other 2 ends to your RCA bundle running to the amplifier. 
• Connect the remote wire to the amp turn on wire from your aftermarket head unit using the provided bullet connectors. 

Step 9

Route the RCA's to the passenger seat area:

• Route the RCA's down the inside of the passenger side of the dash towards the passenger floor board. Continue around and behind the top of the floor carpet towards the bottom of the A-pillar. 
• Continue running the RCA bundle through the factory wiring channel until you reach the area under the passenger seat. The wire channel clips can be opened with a small flat head screw driver to release the tab and the top will lift open. 
• Run the RCA's under the carpet and through the opening in the carpet near the floor vents. Connect the RCA's to the RCA's on the side of the Kicker Amplifier.

Step 10

Routing the power wire from battery for amplifier:

• Open the hood and locate the main firewall grommet on the passenger side of the vehicle.
• 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 or metal coat hanger to assist in passing the power wire from the engine bay to the interior. 
• Mock up where you want to mount the fuse block.
• Connect the short length of power wire with the black shielding to the fuse block ensuring that the grommet is seated in the groove.
• Attach the other end of power wire with shielding to the fuse block, again   ensuring that the grommet is seated in the groove. Secure using the allen wrench. Place the plastic Kicker branded cover over the completed fuse assembly. 
• Our recommendation is to run the power wire along the inside of the drivers side fender towards the firewall and across the fire wall towards the passenger side firewall grommet. 
• Use zip ties to secure the wires so that they are free of moving or hot engine components.
• Route the power wire down the kick panel and through the factory wire channel, under the carpet and to the power side of the amplifier.

Step 11

Routing the ground wire for amplifier:

• Route the provided ground wire under the carpet and ground to factory ground location under the seat using the provided 10 mm bolt.

Step 12

Making connections to amplifier:

• Place the Alpine S2-A55V amplifier under the passenger seat.
• You may use the provides velcro or the universal brackets to mount it to the carpet or floor.
• Do not permanently mount until all wires have been connected.
• Connect the RCA's to amplifier:
• Connect the RCA's:
• CH-1 L - FL Clear
• CH-2 R - FL Red
• CH-3 L - RL Clear
• CH-4 R - RR Red
• Sub L - SL Clear
• Sub R - SR Red
• Remote wire to REM

Insert the ferrule connectors in the corresponding location under the plate and secure with a phillips screwdriver. 

• Connect the provided black ground wire to the amplifier and secure using an allen wrench. 
• Connect the power wire to the amplifier and secure using an allen wrench. 
• Connect the blue remote wire to the remote port on the amplifier and secure using an allen wrench. 

Step 13

Connect the power wire to the battery:

• Connect the short length of power wire to the positive battery terminal using the pre-connected ring terminal.

Step 14

• Power on your vehicle and test the audio settings to ensure that your radio and amplifier are working.
• If you have head unit powers on but you have no sound, check to make sure that you connected the remote turn on wire.

Step 15

Setting the gains on your new Alpine S2-A55V amplifier:

• Set Turn-on Type to "REM/LO"
• Set Input Channel to "3/4"
• Set Sub Input to "SUB"
• Find a song that will play for at least a few minutes.
• Turn up the volume on your head unit to about 75% of the MAX volume.
• Using a small flathead screwdriver adjust the CH-1/2 gain (Front Speakers) until your desired sound level is reached.
• Repeat the same for the CH-3/4 gain (Rear Speakers) setting.
• Repeat once more for the Sub gain.

This will set the overall sound level for your vehicle. If you start to notice distortion or that the sound is clipping or stopping you have set your gains to high!

You can further adjust to your liking using the EQ settings within your head unit.

Step 16

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!

Congratulations on installing your new JBL Amplifier Bypass Harness and Alpine 5 Channel Amplifier!