Are you looking for a stereo wiring diagram for your 1990 Toyota Corolla? You’re at the right place. This guide provides you with comprehensive information on the stereo wiring diagram for your car. You’ll learn about the different wires, their colors, and how to connect them to your aftermarket stereo. This guide is perfect for both DIY enthusiasts and professional installers.
Toyota Corolla Stereo Wiring Diagram Basics
The Toyota Corolla has undergone several changes throughout the years. However, the stereo wiring diagram for the 1990 model remains the same for most of the models. The stereo wiring diagram consists of the following components and their functions:
| Wire Color | Function |
|---|---|
| Yellow | Constant 12V+ |
| Red | Switched 12V+ |
| Black | Ground |
| Gray | Front Right Speaker Positive |
| Gray/Black | Front Right Speaker Negative |
| White | Front Left Speaker Positive |
| White/Black | Front Left Speaker Negative |
| Green | Rear Left Speaker Positive |
| Green/Black | Rear Left Speaker Negative |
| Violet | Rear Right Speaker Positive |
| Violet/Black | Rear Right Speaker Negative |
Yellow Wire (Constant 12V+)
The yellow wire provides a constant 12V+ power supply to your stereo. This wire is connected directly to your car’s battery, and it never turns off even when you turn off your car. This wire is important to ensure that your stereo settings are saved even when you turn off your car.
Red Wire (Switched 12V+)
The red wire provides a switched 12V+ power supply to your stereo. This wire is connected to your car’s ignition switch, and it only supplies power when your car is turned on. This wire is essential to prevent your stereo from draining your car’s battery when your car is turned off.
Black Wire (Ground)
The black wire is the ground wire, which provides a path for electrical current to return to the car’s battery. It prevents electrical shocks, reduces noise, and ensures that your stereo works correctly. Make sure that you connect this wire to a metal surface that is close to your stereo unit.
Speaker Wires (Gray, Gray/Black, White, White/Black, Green, Green/Black, Violet, Violet/Black)
The gray, gray/black, white, white/black, green, green/black, violet, and violet/black wires are the speaker wires. These wires carry the audio signals from your stereo to your speakers. The negative wires (gray/black, white/black, green/black, and violet/black) are connected to the negative terminals of your speakers, while the positive wires (gray, white, green, and violet) are connected to the positive terminals of your speakers.
How to Install an Aftermarket Stereo in Your Toyota Corolla
If you’re planning to install an aftermarket stereo in your Toyota Corolla, this section provides you with step-by-step instructions on how to do it:
Step 1: Disconnect Your Car Battery
Before you start installing your aftermarket stereo, make sure that you disconnect your car’s battery. This is to ensure that you don’t accidentally short-circuit any wires and damage your car’s electrical system.
Step 2: Remove the Existing Stereo
Remove the existing stereo from your car by following the manufacturer’s instructions. Most stereos are held in place by screws or clips, so make sure that you remove them carefully.
Step 3: Connect Your Aftermarket Stereo
Connect your aftermarket stereo to your car’s wiring harness by matching the wire colors. Make sure that you connect each wire securely and wrap them with electrical tape or wire connectors to prevent them from touching each other.
Step 4: Test Your New Stereo
Test your new stereo by turning on your car and checking if it works correctly. If it doesn’t work, check if you’ve connected all the wires correctly and securely.
FAQ
Q: What is the difference between the yellow and red wires in the stereo wiring diagram?
A: The yellow wire provides a constant 12V+ power supply to your stereo, while the red wire provides a switched 12V+ power supply to your stereo. The yellow wire is connected directly to your car’s battery, and it never turns off even when you turn off your car, while the red wire is connected to your car’s ignition switch, and it only supplies power when your car is turned on.
Q: Can I install an aftermarket stereo in my Toyota Corolla?
A: Yes, you can install an aftermarket stereo in your Toyota Corolla. However, you need to make sure that you follow the manufacturer’s instructions and match the wire colors correctly to prevent any damage to your car’s electrical system.
Q: What are the speaker wires in the stereo wiring diagram?
A: The speaker wires in the stereo wiring diagram are the gray, gray/black, white, white/black, green, green/black, violet, and violet/black wires. These wires carry the audio signals from your stereo to your speakers. The negative wires (gray/black, white/black, green/black, and violet/black) are connected to the negative terminals of your speakers, while the positive wires (gray, white, green, and violet) are connected to the positive terminals of your speakers.
Q: What should I do if my new stereo doesn’t work?
A: If your new stereo doesn’t work, check if you’ve connected all the wires correctly and securely. You can also check if you’ve followed the manufacturer’s instructions correctly. If you’re still having issues, it’s best to consult a professional installer.
Conclusion
The Toyota Corolla stereo wiring diagram is essential if you’re planning to install an aftermarket stereo in your car. It provides you with comprehensive information on the different wires, their colors, and how to connect them to your new stereo. With this guide, you can easily install your new stereo and enjoy your favorite music while driving.
