Honda Civic Interior LED Accent Lighting Install (Dual-Zone Switched)

Note your stereo's anti-theft code before you begin, since disconnecting power will lock the radio. Clear a clean, flat bench where the console can be worked on comfortably. Open the hood and disconnect a battery terminal with a 10mm wrench so the wiring is dead before you cut into anything. Confirm the transmission is in gear and the car is on level ground, as you will briefly release the parking brake later to maneuver the console past the shifter.

For a manual car, loosen the shift-knob retaining nut with a 14mm wrench, turning it clockwise, then spin off the knob and nut and set them aside. Reach into the shift boot and lift straight up to unclip the brushed-aluminum trim surrounding it; if it resists, ease a flathead under an edge and pry gently to avoid deforming the plastic. Lift the freed panel up and toward the rear to release its remaining tabs. Inside the console bin, pull out the rubber mat and remove the two 5/16" bolts beneath it with the nut driver.

Once the boot trim is off, another pair of 5/16" bolts sits alongside a set of two T10 Torx screws; the Torx only need to come out if you are also routing an aux cable. Remove the trim clip near the pedals by popping its center pin with a flathead and pulling the body out, then take off the panel above the pedals by turning its fastener and pulling down and out. On the passenger side, release the cover under the glovebox and pop its clip. Slide the console rearward while lifting, raise it several inches, and unplug the cigarette-lighter connector. Move the seats and, if needed, release the parking brake momentarily to clear the shifter, then lift the console out and carry it to the bench.

Pick a switch location near the 12V outlet, keeping it far enough to the left that the outlet cover still opens and closes without interference. Check both the top and underside of that spot for plastic ribs or wiring that the drill could hit. Drill the mounting hole from the top face so burrs land on the hidden side; a 1/2" bit suited the switches used here, but confirm the size on the switch packaging. Test-fit the switch and step up one bit size at a time until it seats snugly and fully.

Peel back the tape and loom on the cigarette-lighter harness, then cut and strip to expose the accessory feed. Wire each SPDT switch to its ground, load, and power posts per the diagram on the switch box, using red 18 ga for power and load and black 18 ga for ground. Crimp female terminals onto the leads. Run one switch's LED output forward toward the dash and the other's toward the rear, leaving generous slack at each end so the runs reach the pods and strips. Zip-tie the harness tidily out of the way.

Route the rear switch wiring under the carpet from the console opening toward the seat-slider brackets, bringing it back to the surface near each front seat. Mount each three-LED strip low against the carpet flap at the base of the seat so the emitter stays out of sight and lights the toe-kick rather than shining on ankles. Because the strips' factory adhesive will not grip curved trim, back each one with the stiff hook half of a velcro strip cut to length. Connect each strip's black lead to the switch ground and its black-with-white-stripe lead to the switch power; extend the runs as needed so the two sides meet in the middle, then insulate every joint.

On the panel above the pedals, choose a spot behind the twist clip for the driver pod and drill a hole only large enough to pass the wires. Peel off the foam backing, run the leads toward the console, replace the foam over them, and refit the panel with the pod leads accessible. On the passenger side, center the pod so its beam fills the footwell, using an existing hole near the clip if one lines up. Route the front switch wires up into the dash, keeping them taut and zip-tied, then splice them to the pod leads and seal each connection with heat shrink.

Slide the console partway back in and reconnect the cigarette-lighter plug. Reconnect the battery terminal and turn the key to accessory. Flick both switches and confirm each zone lights, then verify the front and rear operate independently as well as together; if they only work in tandem, you have a crossed wire to trace. Once everything checks out, reinstall all trim in reverse order, tuck any loose wiring up out of the way, refit the shifter knob, and re-enter the radio code.