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How to Fix a Subaru Impreza Brake Light Fault
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Welcome to this DIY guide! Today, we're tackling a common issue in the Subaru Impreza: brake light faults. If you've found yourself with no brake lights, and your trusty Impreza isn't signaling like it should, this step-by-step guide is for you. Let's get our hands dirty and fix this wiring nightmare!
Step 1: Locate the Problem
First, identify the heart of the problem. The brake lights in the Subaru Impreza are crucial for safety, so if they're not working, it's a red flag. Start by checking the brake light switch and the fuse relay box, typically located on the left side of the engine compartment. Look for a 20 amp fuse – it's usually labeled and easy to find.
Step 2: Test the Fuse
Use a test light to confirm whether the fuse is working. If the fuse is intact, it's time to follow the green wire with a white tracer leading to the brake switch pedal bracket. This wire is crucial in the brake light circuit.
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Step 3: Inspect the Brake Light Switch
Accessing the brake light switch can be tricky, especially if previous owners have added aftermarket systems. You might have to navigate through a jungle of wires and bypassed security systems. Be patient and methodical in tracing the brake light switch, and once located, unplug it for further inspection.
Step 4: Deal with Aftermarket Additions
If you encounter any aftermarket installations, such as a bypassed security system, remove them carefully. These additions can often cause more harm than good, complicating the wiring and causing faults.
Step 5: Repair and Solder Wires
After removing unnecessary aftermarket parts, focus on repairing any damaged wires. Soldering is your best bet for a durable fix. Remember to slide a piece of shrink wrap over the connection for extra protection.
Step 6: Test and Replace the Brake Light Switch
Remove the brake light switch and test it for continuity. If it's faulty, replace it. A common replacement part is the Napa SL330. When installing the new switch, ensure it's properly aligned and functioning.
Step 7: Check Ground Connections
A faulty ground connection can also lead to brake light issues. Check the ground located in the center rear of the trunk. Ensure it's tight and corrosion-free.
Step 8: Replace Faulty Bulbs
Inspect all brake light bulbs. If any appear dim or damaged, replace them. Sometimes, the issue is as simple as a burnt-out bulb.
If you want to replace the brake light bulb in your Subaru Impreza but don't know which bulb is right for you, you can find that information here: 2010 Subaru Impreza Light Bulb, 2009 Subaru Impreza Light Bulb, 2008 Subaru Impreza Light Bulb, 2007 Subaru Impreza Light Bulb.
Step 9: Clean and Repair Sockets
Examine the light sockets, especially if you notice any moisture or corrosion. Clean them thoroughly and apply dielectric grease to prevent future corrosion.
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Step 10: Final Testing
Reassemble everything and test the brake lights. Have someone help you by pressing the brake pedal while you check the lights. Don't forget to test the turn signals and parking lights as well.
Step 11: Adjustments and Finishing Touches
Finally, adjust the brake light switch if necessary. It should engage the brake lights without causing the brakes to engage prematurely. Once everything is functioning correctly, tidy up your workspace, and give yourself a pat on the back.
Remember, dealing with car repairs, especially electrical ones, requires patience and attention to detail. If you ever feel out of your depth, don't hesitate to seek professional help. Safety always comes first!
Happy DIY-ing, and keep those Subarus shining bright on the road!
Nick Marchenko, PhD
Industrial Engineer & Automotive Content Specialist
Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.
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