Electrical

6 of 6 compatibility entries for Acura

Lighting - HID conversion Verified Modification Required

Factory OEM HID kit (Matsushita ballasts with D2R bulbs)

Source: TL - 1999
Target: Civic (EG (JDM one-piece H4H headlamps)) - 1992-1995

The 1999 Acura TL's OEM D2R HID system is the best-fitting HID option for JDM H4H headlamps (EG Civic J-spec one-piece lights; the same approach was established on JDM DA Integra lamps). The D2R base width is almost identical to the H4H so the bulb does not shake in the socket, and the arc position matches the H4H filament placement, preserving essentially the stock beam placement - the bulb sits only about 1/8 inch further back due to the large HID plug, which also prevents the bulb falling through the housing. Use D2R (with the light-blocking stripe for reflector housings), not D2S. Nothing bolts up: bulb base, seal, retention clip, and harness all require the modifications described. High beam function is lost since the dual-filament H4H cannot be replicated by the single-arc HID. OEM D2R/D2S bulbs are cheap, non-brand-specific, and available from any dealer or eBay, and an unmodified factory kit is more reliable than a rebased aftermarket kit.

moderate
Overhead console / HomeLink and interior lighting Verified Modification Required

HomeLink overhead console (with navigation microphone housing)

Source: TSX (CL9) - 2004-2008
Target: Fit (GE8) - 2009-2014

Most Honda and Acura HomeLink consoles line up with the GE8's two forward mounting holes (nearest the windshield), so a straight HomeLink swap bolts up without roof clearance issues. The 2004-2008 Acura TSX unit is the reference donor; equivalent consoles come from the 2005-2008 Odyssey EX(L), 2003-2007 Accord EX with Nav/HomeLink, 2006-2008 Pilot EXL, and 2006-2008 Ridgeline RTL. Choose a grey or clear-grey unit to match the Fit interior. The donor module must include the Door/Off switch: a module without it (such as a 2006 Odyssey unit) will operate the lights and HomeLink but cannot auto-off the lights after the door closes, so a TSX-type module with the Door/Off switch is required for full function. A GE8 Sport with Navigation already has the overhead map-light wiring; a base car lacks it and needs an extra 12V tap (dome pink wire). Retaining the navigation mic requires transferring the Fit's mic block into the donor console.

difficult
Homelink / interior lighting / HandsFree Link Verified Modification Required

Homelink interior light switch module (39180-SEC-A51ZB)

Source: TSX (CL9) - 2003-2005
Target: CR-Z (ZF1) - 2011-2016 (EX trim)

The TSX module shares the CR-Z's overhead-console footprint and mounts with the two factory 8 mm screws into the existing EX 10-pin location, adding Homelink buttons, blue ambient lighting and a HFL microphone. The EX already provides the 10-pin connector and switched power in the headliner. The Accord-with-Navi module (39180-SDA-A52ZA) is an equivalent donor but has an amber LED rather than blue; the blue LED can be transplanted from a TSX unit. A map light case from the GE8 Fit (P/N 34404-SNA-A21ZD) can be fitted for a closer color match. Base CR-Z cars use a different 4-pin connector and have no switched 12V at that spot, so they require additional wiring and cannot use this drop-in approach.

difficult
Charging and starting power distribution Verified Modification Required

K-series charge (charging and starting) harness

Source: RSX Type S (DC5) - 2002-2006
Target: Civic (EG/EK) and Integra (DC2) (EG / EK / DC2) - 1992-2001

With the battery and fuse box retained in their OEM engine-bay locations, a fully disassembled RSX Type S charge harness can be adapted with little or no cutting; only the fuse-box connector ends need modifying and the rest is largely plug-and-play into the K20 engine harness. Typical layout uses 4-gauge cable for the starter, fuse-box, and alternator power runs, with a 2-gauge battery-negative-to-chassis ground (one builder cited 6 gauge as the Honda-specified power-cable size). A simplified single-feed layout runs one cable alternator-to-starter with a fuse-box jumper, which suits a trunk-mounted battery. The transmission housing (starter mounting) must be well grounded in addition to the chassis ground.

difficult
Lighting - HID projector retrofit Verified Modification Required

TSX OEM HID projectors (D2S)

Source: TSX
Target: Civic (EG) - 1992-1995

Genuine Acura TSX HID projectors with D2S bulbs and HID ballasts fit inside the stock EG Civic headlight housings, but nothing bolts up - housing cutting, bracket fabrication, and custom wiring are all required. On these newer TSX projectors the projector's front half has the cutoff shield molded into it, so no external shield is needed. The original author retained the OEM fluted glass lens and reported a clean cutoff on the completed driver's side; required extras are the two projectors, two D2S bulbs, two ballasts, L brackets, machine screws and #2 washers, silicone, Loctite, and a harness. Keeping a spare set of EG headlights is recommended if the car is a daily driver, since the conversion is permanent.

difficult
Keys and Remotes Verified Modification Required

TSX switchblade (flip) key fob

Source: TSX (CU2) - 2009
Target: Accord (8th gen (CP/CS)) - 2008-2009

A dealer-programmed TSX remote will not work on the Accord because the TSX remote uses a different FCC ID; the dealer can only program the immobilizer to allow engine starting, leaving the remote buttons non-functional. This is why the Accord's own remote board is transplanted into the TSX housing rather than swapping electronics. The immobilizer chip may not sit on the circuit board at all - on valet and TL keys members found it embedded in the blade or rotating section, so it must be located and relocated deliberately.

difficult