How to Replace the Turn Signal Relay on a 1987 Toyota Corolla

Introduction

Replacing the turn signal relay on your 1987 Toyota Corolla is an important maintenance task that will keep your turn signals working properly and safely. This straightforward repair can usually be completed in an hour or less with some basic hand tools. In this guide, I will walk through the complete process of locating and replacing the turn signal relay on a 1987 Corolla step-by-step.

What is the Turn Signal Relay?

The turn signal relay is an electrical component that activates the left and right turn signal lights when the turn signal lever is moved up or down. It is essentially a switch that completes the circuit to illuminate the turn signals.

The relay is usually located in the fuse box under the dashboard. It may be labeled as "turn," "flasher," or "hazard." The relay clicks audibly when operating normally. Failure of the turn signal relay will result in turn signals that do not flash or flash rapidly.

Gather Necessary Tools and Materials

Replacing the turn signal relay is a straightforward job, but you will need a few basic tools and supplies:

New turn signal relay - Purchase a replacement relay that matches the original part number. An auto parts store can look this up by your VIN.
Phillips screwdriver - To remove screws to access the fuse box.
Needle nose pliers - Helpful for removing electrical connectors.
Flashlight - To see better in the dark fuse box area.
Small flat blade screwdriver - Optional, to gently pry out the old relay if needed.

Locate the Turn Signal Relay

The first step is to locate the turn signal relay in the fuse box. Here are the steps to find it:

Turn the hazard lights on so you can hear the relay clicking. This will help you locate it.
Open the fuse panel cover under the left side of the dashboard. You may need to remove a couple screws.
Identify the turn signal flasher relay. It will be labeled and visibly clicking from the hazard lights being on.

Remove the Old Turn Signal Relay

With the relay located, now you can remove the old unit:

Pull relay straight out - Don't wiggle it. Pull firmly straight outward from the socket.
Use pliers if necessary - Gently grip with needle nose pliers if it won't come out by hand.
Check for corrosion - Look for any dirt, corrosion, or damage on the relay terminals.
Clean socket - Use a clean cloth to wipe out any dirt or debris inside the relay socket.

Install the New Turn Signal Relay

Installation of the new relay is easy. Simply follow these instructions:

Match the prong layout - Make sure it lines up correctly with the socket. Don't force it.
Push relay straight in - Press it firmly and evenly until fully seated in the socket.
Check that it clicks - Turn on hazards to verify that it clicks properly.
Close fuse panel - Replace any screws and close the fuse panel cover.
Test turn signals - Verify normal operation of left and right turn signals.

And that's it, you've successfully replaced the turn signal relay! Taking an hour to replace this inexpensive part can save you from headaches and safety issues down the road. With a little time and effort, you can keep your 1987 Corolla's systems operating properly.

Frequently Asked Questions

What are common turn signal relay problems?

No flashing - If one or both turn signals do not flash at all, it likely indicates a bad relay. Try tapping on the relay while activated to see if it starts working.

Fast flashing - An abnormally fast turn signal usually means a failing relay. It should click steadily about once per second.

No clicking sound - If you don't hear the audible click from the relay, it could mean a bad relay or blown fuse.

Where is the turn signal relay on other Toyota models?

The location is similar on most older Toyotas - look for the labeled relay clicking in the fuse box. Some newer models have an electronic flasher that is part of the lighting control module.

What if I can't find the turn signal relay?

Use your phone to search online images for the fuse box diagram showing the turn signal relay location. You can also consult your owner's manual or a repair guide for your specific model year.

Can I just clean or tap on my old relay?

It's always best to replace it, as a sticking or corroded relay will likely fail again soon. The relay is an inexpensive part that takes only a few minutes to replace.