MILIPARTS Main Relay Assembly for Honda/Acura 39400-S84-003 — Direct-Fit Replacement, Complete Assembly

MILIPARTS Main Relay Assembly is a direct-fit replacement relay engineered to restore electrical control to select Honda and Acura models using OE reference 39400-S84-003.

If your vehicle exhibits intermittent starting, accessory power loss, or electrical control faults related to the main relay, this MILIPARTS unit is designed to match the original fit, form, and function for a reliable repair. It fits a range of late-1990s and early-2000s Honda and Acura models and ships as a complete assembly for straightforward installation. Below you’ll find practical details about compatibility, installation, performance expectations, and whether this part is right for your repair job.

Which vehicles will this MILIPARTS main relay fit?

This relay covers a set of specific Honda and Acura models from the late 1990s through the early 2000s. Confirm fit using your vehicle’s year, make and model against the reference numbers before ordering.

• Honda Accord (1998–2002)
• Honda Odyssey (1998–2004)
• Honda Pilot (2003–2004)
• Honda Prelude (1998–2001)
• Acura CL (2001–2003)
• Acura MDX (2001–2002)
• Acura TL (1999–2003)
• OE references: 39400-S84-003, 39400S84003

How difficult is installation for a DIYer?

Installation is typically straightforward for someone comfortable working under the dash or in the engine bay, depending on model. The relay is supplied as a complete assembly intended to match OEM mounting points and connector pins.

• Direct-replacement design reduces modification needs.
• Basic hand tools are usually sufficient.
• Follow vehicle service manual for safe removal and reinstallation.
• Disconnect battery before starting electrical work.

What should I expect from its electrical performance and durability?

This main relay assembly is manufactured to interface with original electrical systems and handle standard load and switching duties. It is not a performance upgrade but a restoration component intended to restore reliable operation when the original relay fails.

• Engineered to meet original connector and pin layouts.
• Designed for normal operating currents and switching cycles.
• Quality control measures mimic engineering part specifications.

How can I be sure this part is the correct match for my car?

Always cross-check part numbers and vehicle compatibility before purchase. Use your VIN, year, make, and model with online part-finder tools or compare the OE reference stamped on your existing relay to the numbers provided.

• Compare OE reference: 39400-S84-003 (also shown as 39400S84003).
• Visually confirm connector shape and pin count against your original part.
• Contact seller support with vehicle details if unsure.

Who this is for: Technically-minded vehicle owners, independent mechanics, and small repair shops seeking a cost-effective, OEM-replacement main relay for qualifying Honda and Acura vehicles. If you need a like-for-like relay to fix intermittent electrical faults or to replace a failed OEM unit, this MILIPARTS assembly provides a practical solution when matched to the correct model and year.