The Mercedes-Benz W201, affectionately known as the "190E," is a classic for good reason. Its timeless design and robust engineering have made it a favorite among enthusiasts. However, its original audio system often leaves something to be desired in our modern, tech-driven world. Upgrading to a double din head unit can drastically improve your driving experience, offering features like Bluetooth connectivity, navigation, and a modern touchscreen interface. While it might seem daunting, installing a double din in your W201 is achievable with the right tools, patience, and a clear guide. Let's dive in and bring your classic Mercedes into the 21st century.
Why Upgrade to a Double Din in Your W201? Let's Talk Benefits!
The original radio in the W201 is, let's face it, pretty basic. It probably plays cassettes (remember those?) and maybe has a limited FM/AM radio. A double din head unit opens up a whole new world of possibilities. Here's a quick rundown of the benefits:
- Modern Connectivity: Bluetooth for hands-free calling and music streaming. Say goodbye to fumbling with CDs or aux cables!
- Navigation: Many double din units offer built-in GPS navigation or smartphone integration for using apps like Google Maps or Waze. No more getting lost!
- Improved Sound Quality: Even with the stock speakers, a modern head unit can significantly improve sound clarity and power.
- Touchscreen Interface: A user-friendly touchscreen makes controlling your audio and navigation a breeze.
- Backup Camera Compatibility: Many double din units support backup cameras, adding a valuable safety feature to your classic car.
- Aesthetics: A modern head unit can freshen up the interior of your W201, giving it a more contemporary look.
Gathering Your Arsenal: Tools and Materials You'll Need
Before you even think about touching your W201, make sure you have all the necessary tools and materials. This will save you a lot of frustration and trips to the auto parts store mid-project.
- Double Din Head Unit: Choose a unit that fits your budget and desired features. Measure the available space in your W201 to ensure compatibility.
- Wiring Harness Adapter: This is crucial! A wiring harness adapter allows you to connect the new head unit to the W201's factory wiring without cutting any wires. This preserves the original wiring and makes installation much easier. Make sure it's specifically designed for the W201.
- Double Din Installation Kit/Dash Kit: This kit provides the necessary brackets and trim pieces to securely mount the double din head unit in the W201's dashboard.
- Radio Removal Keys: These are special tools designed to release the factory radio from the dashboard. Some kits include these.
- Wire Strippers/Crimpers: For connecting wires if needed.
- Butt Connectors or Solder and Heat Shrink Tubing: For making secure electrical connections. Butt connectors are generally easier for beginners.
- Electrical Tape: For insulating connections.
- Screwdrivers (Phillips and Flathead): For removing screws and prying panels.
- Panel Removal Tool: This tool is designed to safely remove interior panels without damaging them. A flathead screwdriver can work in a pinch, but be very careful.
- Multimeter: To test voltage and continuity.
- Patience: Seriously, you'll need it.
- Optional: Backup Camera: If you want to add a backup camera, now's the time to get one.
Preparing Your W201: Safety First!
Before you start tearing into your dashboard, it's essential to take some precautions.
- Disconnect the Negative Battery Terminal: This is the most important step! Disconnecting the battery prevents electrical shorts and potential damage to your car's electrical system. Locate the negative terminal on your battery (usually marked with a "-" symbol) and use a wrench to loosen the nut and remove the cable. Tuck the cable away so it doesn't accidentally reconnect.
- Gather Your Tools: Have everything you need within easy reach.
- Protect Your Interior: Cover your seats and dashboard with towels or blankets to prevent scratches or damage.
Removing the Old Radio: Out with the Old, In with the New
This step can be a bit tricky, depending on the type of radio your W201 has.
- Locate the Radio Removal Slots: Most W201s have two slots on either side of the radio.
- Insert the Radio Removal Keys: Insert the keys into the slots until you hear a click. This click indicates that the keys have engaged the release mechanism.
- Gently Pull the Radio Out: Once the keys are engaged, gently pull the radio out of the dashboard. You may need to wiggle it slightly.
- Disconnect the Wiring: Once the radio is partially out, you'll see the wiring harness and antenna cable connected to the back. Carefully disconnect these connections. Take a picture of the wiring connections before disconnecting them. This will be helpful later when connecting the new head unit.
- Remove the Radio Completely: With the wiring disconnected, you can now remove the radio completely.
Important Note: Some W201s might have a different radio removal method. Consult your owner's manual or search online for specific instructions for your model.
Wiring the New Head Unit: Connecting the Dots
This is arguably the most critical part of the installation. Take your time and double-check your connections to avoid any problems.
- Use the Wiring Harness Adapter: This adapter connects the new head unit to the W201's factory wiring harness. Match the wires from the new head unit's wiring harness to the corresponding wires on the adapter. The adapter should come with a wiring diagram that clearly identifies each wire's function.
- Connect the Wires: You can use butt connectors or solder and heat shrink tubing to connect the wires. Butt connectors are generally easier for beginners.
- Butt Connectors: Strip the ends of the wires to be connected. Insert the wires into the butt connector and crimp it securely.
- Solder and Heat Shrink Tubing: Twist the wires together. Solder the connection and then slide a piece of heat shrink tubing over the connection. Use a heat gun to shrink the tubing, creating a waterproof and insulated seal.
- Connect the Antenna Adapter (If Needed): Some aftermarket head units require an antenna adapter to connect to the W201's antenna cable.
- Test the Connections: Before installing the head unit in the dashboard, connect the battery and test the connections. Turn on the head unit and check that it powers on and that the speakers are working.
Common Wire Colors and Functions (Typical, but ALWAYS Verify with Your Wiring Diagram):
- Red: 12V Accessory (Switched Power)
- Yellow: 12V Constant (Battery Power)
- Black: Ground
- Blue: Remote Turn-On (for amplifiers)
- Orange: Illumination (dims the display when the headlights are on)
- White/Gray/Green/Purple: Speaker Wires (each color usually represents a different speaker)
Important Note: Always consult the wiring diagrams that come with your head unit and wiring harness adapter. Wire colors can vary between manufacturers.
Installing the Double Din Head Unit: Putting It All Together
Now that the wiring is done, it's time to install the head unit in the dashboard.
- Install the Double Din Installation Kit: Follow the instructions that come with the installation kit to assemble the brackets and trim pieces. This kit will provide a secure and aesthetically pleasing mounting solution for the double din head unit.
- Connect the Wiring Harness and Antenna Cable: Connect the wiring harness and antenna cable to the back of the new head unit.
- Slide the Head Unit into the Dashboard: Carefully slide the head unit into the dashboard, making sure it's properly aligned.
- Secure the Head Unit: Secure the head unit to the brackets using the screws provided in the installation kit.
- Test the Head Unit Again: Before reassembling the dashboard, test the head unit again to make sure everything is working properly.
Reassembling the Dashboard: The Finishing Touches
With the head unit installed and working, it's time to reassemble the dashboard.
- Reinstall Any Removed Panels: Carefully reinstall any panels that you removed during the installation process. Use a panel removal tool to avoid damaging the panels.
- Reconnect the Battery: Reconnect the negative battery terminal.
- Test Everything One Last Time: Test the head unit, speakers, and any other electrical components that you disconnected during the installation process.
Frequently Asked Questions (FAQ)
- Will a double din unit fit in my W201? Yes, with the correct dash kit, a double din unit can be installed in most W201 models.
- Do I need a special wiring harness? Yes, a wiring harness adapter is essential to avoid cutting factory wires.
- Is it difficult to install a double din myself? With patience and the right tools, it's manageable. However, professional installation is recommended if you're not comfortable with electrical work.
- Can I retain my steering wheel controls? Yes, with a compatible adapter, you can often retain steering wheel control functionality.
- What if I shorted the wires? Disconnect the battery immediately and inspect the wiring for damage. Repair any damaged wires before reconnecting the battery.
Conclusion
Installing a double din head unit in your W201 can significantly enhance your driving experience, bringing modern technology to a classic car. Remember to prioritize safety, take your time, and double-check your connections. With the right preparation and a bit of effort, you'll be cruising in style with your upgraded sound system in no time.