Toyota Matrix Relay Replacement Guide for 2003-2009 Models
A failing relay, a small and inexpensive part, can prevent your Toyota Matrix from starting or cause major systems to fail.
- A single bad relay can cause a no-start condition or system failure (A/C, lights, etc.).
- Symptoms point to the specific relay that has failed; a car that cranks but won't start often points to the fuel pump relay.
- Most relays are in the under-hood or in-cabin fuse boxes and are very easy to replace without tools.
- A quality aftermarket relay is a cost-effective and reliable alternative to an expensive OEM part for this vehicle.
Understanding Relay Failure in Your Matrix
A relay is a common wear item that can fail after years of service. Heat and the constant switching on and off can wear out the internal contacts. Because the 2003-2009 Toyota Matrix uses these relays for many critical systems, a single failure can lead to a variety of symptoms, from an engine that won't start to an A/C that only blows warm air. The key to diagnosis is matching the symptom to the specific relay's function.
Symptoms of a Bad Relay
The signs of a bad relay depend entirely on which system it controls. Here are the most common failures for the 2003-2009 Matrix:
- Bad Fuel Pump Relay: Your engine cranks but refuses to start. You might also experience sudden engine stalling while driving, or you may no longer hear the quiet, 2-second hum of the fuel pump when you first turn the key.
- Bad Starter Relay: You turn the key and get nothing—no crank, no click. 🎬 Watch: How to find and remove the starter relay. Alternatively, you might hear a rapid clicking sound, which happens when the relay tries but fails to send enough power. Intermittent starting, where the car starts sometimes and not others, is also a classic sign.
- Bad A/C Relay: The most obvious symptom is your air conditioning blowing warm or room-temperature air. You may also notice that the A/C compressor clutch doesn't 'click' on when you press the A/C button.
No Recalls for Relays
While there have been several significant recalls for the 2003-2009 Toyota Matrix, they concern the airbags and SRS control modules. There are no active recalls or technical service bulletins (TSBs) for widespread failures of the multi-purpose relays in these vehicles.
Choosing the Right Aftermarket Relay
When shopping for a new relay, you'll find OEM parts from the dealer and aftermarket options. For a simple, common part like a relay, a quality aftermarket part is a reliable and budget-friendly choice. Brands like DENSO are original equipment manufacturers for Toyota, so purchasing a DENSO-branded relay from an aftermarket source gives you OEM quality without the dealer price. Standard direct-fit replacement brands also offer a dependable solution at a very low cost, and they are perfectly suitable for this application.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Dealer) | $25 - $112 |
| New Aftermarket | $18 - $52 |
| Shop Labor | $50 - $100 |
Easy DIY Replacement
Most relays in your Matrix are located in two main fuse boxes: one in the engine compartment next to the battery, and one inside the car under the driver's side dashboard. For these, replacement is as simple as pulling the old relay out and plugging the new one in. 🎬 See this walkthrough for replacing a standard multi-purpose relay. However, some relays (like the fuel pump and starter relay) are tucked behind the dash panel, making them more challenging to access. Always disconnect the negative battery terminal before working on the electrical system.
Frequently Asked Questions (FAQ)
Can I replace a Toyota Matrix relay myself?
Yes, for most relays located in the main fuse boxes, this is a very easy DIY job that requires no tools. You simply locate the correct relay, pull it straight out, and plug the new one in. Relays located behind the dashboard are more difficult and may require removing trim panels.
How do I know which relay is bad?
First, consult your owner's manual or the diagram on the fuse box lid to identify the relay for the failing system. A common diagnostic trick is to swap the suspect relay with an identical one from a non-essential system (like the horn). If the problem moves to the other system, you've confirmed the relay is bad.
Are all the relays in the Matrix the same?
No, but many are. Your Matrix uses several "multi-purpose" relays that are interchangeable for different functions. However, there are also specific relays for certain systems. Always verify the part number on the old relay or use a vehicle-specific parts catalog to ensure you are buying the correct one.
Where is the fuel pump relay on a 2003-2009 Matrix?
On many first-generation Matrix models, the fuel pump relay is not in the main under-hood fuse box. It is often located inside the vehicle, behind the driver's side lower dash or coin tray area, grouped with other relays. 🎬 Watch: Locate the fuel pump and starter relays behind the dash. This makes it more difficult to access than a typical fuse-box relay.
Helpful Videos
Technical Specifications
OEM Part Numbers: 90987-02027 90987-04004 90987-02025 90987-02012 28341-11010
Most common relays are 4 or 5-pin, 12V DC, single pole single throw (SPST) or single pole double throw (SPDT) multi-purpose relays.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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