2016-2018 Acura ILX Engine Fuse Box & Harness: Solving Electrical Gremlins and Decoding Trim Packages

Critical Compatibility Warning: Match Your ILX Options

The primary OEM part numbers covered in this guide — 32200-TV9-A00, 32200-TV9-A01, and 32200-TV9-A02 — are for ILX models that meet two specific conditions:

• They do NOT have the AcuraWatch Plus package (the pre-crash safety system).
• They do NOT have the A-Spec package (which includes factory fog lights).

Essentially, these part numbers typically fit the base and Premium package trims. If your ILX has AcuraWatch or is an A-Spec model, you will need a different, specific harness. For example, part number 32200-TV9-A32 is for models with the Premium and A-Spec packages. Always verify the part number from your original harness before ordering a replacement.

Symptoms of a Failing Engine Harness

A problem with the main engine harness rarely manifests as a single, simple issue. Because it connects so many different systems, you'll often see a cluster of strange and seemingly unrelated electrical problems.

• Multiple Warning Lights: The dashboard may light up with numerous warnings simultaneously, such as 'Emission System Problem,' 'Transmission System Problem,' or 'Check VSA System'.
🎬 See how multiple warning lights can appear during electrical failures.
• Intermittent Failures: Lights may flicker, the radio might cut out, or power windows could stop working, especially after rain or on bumpy roads.
• No-Start Condition: The vehicle may refuse to start, with all lights on the dash flickering when the key is turned.
🎬 Watch: Troubleshooting a no-start condition caused by blown fuses.
• Parasitic Battery Drain: A short circuit within the harness can cause a continuous power draw that drains the battery, even when the car is off.
• Visible Damage: Obvious signs include a burning smell, melted plastic on the fuse box, or green/white corrosion on terminals, often caused by water intrusion.
• Specific Component Failure: One or more systems may stop working entirely, such as headlights, wipers, or the fuel pump.

A failing harness can trigger a cascade of Diagnostic Trouble Codes (DTCs). It's common to see network communication codes like U0100 (Lost Communication with ECM/PCM) or U0140 (Lost Communication with Body Control Module), alongside various seemingly unrelated codes for sensors and actuators that have lost power.

Known Issues: Water Intrusion

Like many Honda and Acura models, the ILX can be susceptible to water leaks that damage electrical components. Water can find its way to the fuse boxes (both in the engine bay and inside the cabin) from clogged sunroof drains, 🎬 Watch: How to locate your ILX fuse boxes and OBD port. a poorly sealed windshield, or failing body seams. This moisture causes corrosion on the harness connectors and fuse terminals, leading to high resistance and intermittent electrical faults that are notoriously difficult to diagnose.

Buying a Used Fuse Box & Harness Assembly

Given that a new OEM harness assembly can cost over $1,800, a used OEM part is an excellent value. However, you must be extremely careful when buying one.

1. Verify the Part Number: This is the most important step. Get the part number directly from your vehicle's original harness. Do not rely on a generic year/model search. The part number is typically on a white tag wrapped around one of the main wiring looms.
2. Confirm Vehicle Options: Double-check with the seller that the donor vehicle had the exact same trim package as your ILX (e.g., 'Premium without A-Spec').
3. Inspect for Damage: Carefully examine photos of the used part. Look for:
   
   • Cut Wires: Ensure no wires have been cut, especially near the connectors.
   • Corrosion: Check all connector pins and fuse terminals for any green or white crusty buildup, which indicates water damage.
   • Melted Plastic: Look for any signs of melting or discoloration on the fuse box housing or around the large-amperage fuses, which indicates a severe short circuit.
   • Intact Connectors: Make sure all plastic connector housings are intact and not cracked or broken.
4. Why Used OEM is a Good Choice: For a complex part like this, a used original equipment (OEM) harness is almost always superior to a new aftermarket version (if one were even available). The OEM part was designed to fit perfectly and uses high-quality connectors and wire gauges. Aftermarket electrical parts can suffer from poor fitment and lower-quality materials, leading to new problems down the road.

Programming and Installation

Replacing the entire engine room wire harness is a very involved and time-consuming job. It requires disconnecting dozens of electrical connectors, removing the battery and battery tray, and carefully routing the new harness through the engine bay. While possible for an experienced DIY mechanic, it is considered a difficult task.

• Difficulty: 4 out of 5
• Estimated Time: 15-20 hours for a professional.
• DIY Feasible: Not recommended for beginners.

Cost Breakdown

The cost difference between new and used for this part is significant, especially when factoring in the high labor cost for replacement.

Part Source	Estimated Cost
New OEM (Dealer)	$1,875 - $2,800
New Aftermarket	Not Generally Available
Used OEM	$150 - $350
Shop Labor Cost	$2,250 - $3,750 (15-25 hours at $150/hr)

Frequently Asked Questions (FAQ)

Recalls and Technical Service Bulletins (TSBs)

As of early 2026, there are no specific recalls or TSBs issued by Acura for a widespread failure of the engine wire harness on the 2016-2018 ILX. However, there are recalls for other components on these vehicles, such as the fuel pump and driveshaft, which a dealer can check for using your VIN.