Description

2006 Acura RL Wiring Diagram – Factory OEM Specs

If you’re staring at a dead horn or a blower motor that only works on high, the last thing you need is an aftermarket diagram someone scanned from a bad copy. I’ve had to re-pin connectors because some third-party sheet said a yellow wire was ground. It wasn’t. The Acura RL 2006 Wiring Diagram you get here is a direct factory file, 111 pages, straight from the OEM archive. Every trace, every fuse position, every relay cavity is drawn the way the engineers intended. No guesswork. No “close enough.” If you work on these cars, you know the RL has a complicated multiplex system. One wrong back-probe can fry a module. This manual keeps you from being that guy.

Air Conditioning and HVAC Circuit Tracing

Page 1 of the manual jumps straight into the A/C wiring. You get the blower motor resistor circuit, the condenser fan relay (if equipped), the lighting switch integration, and the rear defogger relay. I’ve watched techs spend hours chasing a blower that only runs on high because they didn’t check the resistor pack ground path. This diagram shows you the hot-at-all-time feed from fuse 7, the ground path through the door switches, and how the lighting switch ties into the dash illumination. That’s the kind of detail that pays for the manual on one job.

What Does the 111-Page Manual Cover?

This is not a skimpy electrical supplement. The document covers the entire body and chassis wiring: horn relay system, interior lights (driver and passenger door circuits), dash fuse boxes, ground distribution, and the complete air conditioning harness. Each page follows the factory layout with connector views, splice locations, and wire colors using the OEM abbreviation codes. Need to find where the YEL wire from the horn relay runs? It’s traced through the dash harness to the driver door switch. That’s the kind of specific routing you don’t get in a generic service manual.

3 Reasons to Avoid Aftermarket Wiring Schematics

First, aftermarket diagrams often merge multiple years or options into one drawing, so you can’t tell if your RL has the optional rear defogger or not. The factory manual shows you exactly the circuits for your 2006 model. Second, wire colors get changed or mislabeled—I’ve seen a “PPL” wire called “Pink” in a cheap reprint. Third, the paper quality degrades, making tiny dash lines look broken. This digital factory file preserves the original line weights and annotations.

Check the Horn Relay Circuit Before You Assume a Bad Switch

The OCR shows the horn relay lives under the dash, fed by fuse 30 (hot at all time). The YEL wire goes from the relay to the horn switch on the steering column. But the manual also shows a ground path through the driver door switch for the interior light—if that ground is bad, the horn relay might not pull in. Sounds crazy? I’ve seen it. The factory diagram lets you trace the interaction between the interior lighting system and the horn circuit. You bypass the guesswork and go straight to the test point.

Blower Motor Resistor: Factory Wiring vs. Guesswork

The blower motor resistor circuit runs through fuse 7 (hot at all time), then through the blower motor resistor pack to the motor. The diagram shows the four speed taps and the ground path through the resistor. If you lose low speed, it’s almost always the resistor pack—but only if the wiring is intact. The manual shows you the exact splice where the WHT wire splits to the condenser fan relay (if equipped). A lot of guys replace the resistor twice before someone points out the relay coil has a short to ground. This manual prevents that parts cannon approach.

I’ve been turning wrenches since before multiplex systems existed. The Acura RL wiring is not something you can fudge. One shorted wire in the door harness can kill the keyless entry, dome lights, and horn simultaneously. The factory diagram gives you the logic to isolate it. For component location photos and connector views, pair this with the 2005-2006 Acura RL Electrical Component Locations. If you’re chasing a driveability issue that ties into the engine control wiring, the 2007 Acura RL Engine Performance Advanced Diagnostics covers the powertrain side. And for owner-level procedures like fuse panel access, see the Acura RL 2007 User Manual.

Basic wiring theory is the same across cars—if you want a refresher on how relays and switches interact, Automotive Wiring on Wikipedia covers the fundamentals. For industry standards on connector pin numbering, check the Automotive Industry Overview.

Who Needs This Manual?

You. If you own a 2006 Acura RL and you intend to fix anything electrical yourself—headlights, blower motor, horn, interior lights, or A/C circuits—this is the only diagram set you should trust. I’ve been a master technician for 28 years, and I still pull factory files when I work on something unfamiliar. There’s no shame in using the right tool. The shame is melting a harness because you believed an aftermarket diagram. Beginners can use this, too: just read each page top to bottom and don’t skip the fuse legends. The manual labels every fuse cavity by amperage and circuit name.

Can I use this for a 2007 RL?

No. The 2007 model received a wiring update to the multiplex controllers and relay box layout. Stick to the correct year.

What if my RL has an aftermarket alarm or stereo spliced into the harness?

That’s a common mess. The factory diagram shows you the original wires and connectors. You’ll need to identify every splice the previous owner made and compare to the factory colors. Access the manual, print the relevant pages, and go through each circuit with a test light. I’ve done this dozens of times. Mark the diagram with your findings. The factory file gives you a clean baseline. If the aftermarket installer cut into the YEL horn relay wire, you’ll see the splice location in the diagram and can patch it back correctly. Just don’t assume the aftermarket device matches any standard—test everything at the module pins with the diagram in hand.

Every hour you spend guessing wires costs you time and risks a fried module. The factory file is 111 pages of proven routing. Get it, read it, and use it. Access the Factory Manual.