Color-Coded Ignition Switch Wiring Explained

This article will provide you with steps to follow in Wiring your vehicle’s ignition switch and also explains what wires go into the switch.

The ignition switch as the name implies is in charge of triggering the circuits or signals that start the vehicle.

It’s crucial that you know how to go about your ignition switch especially when the main electrical system goes bad. it’s also good that you know to do this in case of an emergency.

Thankfully, the procedure isn’t a tough one provided you have the right guide on it.

This post will teach you how to wire the ignition switch yourself and also provide you with the color codes of different terminals.

Ignition Switch Wiring Explained

Follow the below guide to completely wire your ignition switch.

1. Park the vehicle

This doesn’t imply that you should park at just any spot, make sure you park in a leveled and convenient spot.

2. Discover the terminals on the ignition switch

Determine the connections on the ignition switch’s rear, and then locate and identify them. You may see four terminals labeled “BATT” (Battery), “ST” (Start), “IGN” (Ignition), and “ACC” depending on the vehicle (Accessory).

Get some validation from the manufacturer or the repair handbook for your car to be on the safe side.

3. Remove the Negative battery terminals

Disconnect the negative terminal on your battery to avoid shock in the course of wiring the ignition.

4. Remove Steering wheel coverings

Remove the coverings or trims that might be covering the steering wheels. Look out for any bolt or screw to avoid damaging them.

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5. Remove the Steering Wheel

The ignition switch may be located along the steering column in some vehicles, while others may have it in the dashboard. No matter where it is, removing the steering wheel will greatly simplify your task.

To make the task easier for you, you might need to use a steer wheel puller. Before carrying out this procedure, it is relevant that you check the manual guide for the car or get an ignition switch panel wiring diagram.

6. Unlock the ignition Module Cover

On the ignition module cover, unlock the hooks. You can do this to remove the cover and access the ignition switch. On the clips, there need to be some releases. The release mechanism on the hooks may need to be pushed down with the help of a screwdriver.

7. Turn the keys to the Accessory Position

Turn the key to the “accessory” position and insert it into the ignition. This is necessary since there is no other way to get it out of the ignition module. You might be required to use a flathead screwdriver if you don’t currently have access to your car key.

You would have to take caution if you must employ a flathead screwdriver.

8. Take out the Release Pin

You can now take out the pins that hold the ignition switch once it is released. The pins should be easy to remove if you followed the steps correctly to this point.

However, you just need to press the release pin more firmly if you notice some opposition.

9. Inspect the ignition switch

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You can perform a visual inspection to decipher what’s wrong with the ignition. Look out for damages or disconnections.

You might need to replace or repair it depending on your needs.

10. Inspect the wires

Determine the positive power lead going from the battery to the ignition switch on the car. It is mostly denoted by the color red cable. After locating it, attach the terminal end to the power lead wire and tighten it with a terminal multi-tool. The power line is then attached to the switch’s “BATT” terminal.

11. Plug the Accessory Wire

The accessory wire is responsible for turning on the car accessories. Plug the Accessory Wire into the “ACC” terminal on the ignition switch.

12. Plug the starter relay wire

The Start wire helps turn the car on when the ignition switch is turned to it. Connect the starter relay wire to the “ST” terminal on the ignition switch.

13. Connect the ignition wire

Connect the ignition wire to the “IGN” terminal on the ignition switch of the car. The ignition, wipers, accessories, and other functioning functions of the car are all controlled by this terminal.

14. Reinstall the ignition switch

You would need to apply some pressure to the release pin in order to install the newly rewired switch and install the new ignition switch followed by the ignition switch in the steering column.

15. Test the ignition switch

It’s time to test the freshly wired ignition switch after you’ve secured the ignition switch.

You would need to reconnect the battery to accomplish this. No parts should be reassembled until the new ignition switch has been successfully tested and confirmed.

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16. Reassemble your vehicle

Once the ignition switch has been confirmed to be in a working state, it’s time to reassemble your vehicle.

Make sure your car is switched off with the negative terminal of your battery removed while putting the components on.

That’s all you need to know in order to completely wire your ignition switch with the correct color code.

What wires go to the ignition switch?

The ignition switch’s cables that go into the ignition switch are the color red, black, white-red, white-black, and yellow.

There are four wire terminals, though there might be a slight difference depending on your car model. These terminals are represented by the letters “BATT(BATTERY)” “ST(START)” “IGN (IGNITION)” and “ACC (ACCESSORY)“. You can check your car’s manual guide for the best representation.

Can I bypass the ignition switch?

Yes, it’s technically possible to Bypass the ignition switch. However, you’ll need to have training on how to go about it.

You can also take your car to any repair shop close to you for assistance.


A faulty ignition switch could pose a threat to vehicle owners especially when it’s not addressed on time.

Although it’s natural for most car components to fail after some time it will require you to either replace, repair or bypass them.

This article has provided a detailed guide on how to properly wire an ignition switch and the color codes that go to the ignition switch.

I also recommend that you download a universal ignition switch wiring diagram.