Step 1: Locate the Key Blade
- Hold your key in one hand with the front of the key facing upward.
Step 2: Slide the Release Button
- On the back side of the key housing, you'll see a small sliding button. Slide this button away from yourself.
Step 3: Separate Key Parts
- Once you slide the button, the key housing should come apart into two pieces. One part contains the key blade, while the other houses the battery.
Step 4: Remove the Battery Cover
- There might be a small cap or cover over the battery. Remove this cover by carefully prying it open.
Step 5: Remove the Old Battery
- You should now see the old key battery. Use your screwdriver or fingers to gently pry the battery out of the housing.
Step 6: Insert the New Battery
- Align the new battery with the positive (+) and negative (-) terminals. Make sure the new battery is inserted correctly.
Step 7: Replace the Cover
- Replace the battery cover or cap that you removed in Step 4.
Step 8: Reassemble Key Parts
- Slide the housing parts back together, making sure the key blade aligns properly.
Step 9: Test the Battery
- Press any button on the key fob to check if it works. The key's LED should light up, and the car should respond when you press the unlock or lock button.
Note:
1. If the LED still does not work after replacing the battery, you may need to get a new key or have your key fob checked by a professional.
2. Some key fobs may have different mechanisms, so it's always best to consult your vehicle's owner's manual or check with a certified mechanic if you're not comfortable replacing the battery yourself.
Remember that while this guide is suitable for most Mercedes-Benz S430 models from 2001, there might be slight differences depending on the vehicle's specific year and model. If you're still having trouble replacing the key battery, it's best to consult a professional to ensure you do it correctly.
