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Merc CLK 320 (2003) - key fobs worked this morning; now nothing; red light on dash flashing as per usual, red LED on key fobs flashing...but nothing happening. Tried spare fob...still nothing. Not synchronising? What do I have to do?
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Please double check that you're purchasing the key fob from either VW or a different brand than the one that gave you the error. I'm guessing the brand that you have is making defective key fobs otherwise, the new fob should have worked.
Seeing the date that you posted this, I wonder if this has been resolved?
For your car, if the remote does not open the car door after the battery in the fob has been replaced, do this.
1. Get next to the car with doors locked
2. Push the Unlock button 4 times in succession as you count, one, two...
3. The remote receiver should recognize your fob now
As for the dash LED, it may be unplugged somewhere. The DI cassette has little to do with it. LEDs have an ginormous life span and should not go dead - at least for the life of your car. Does it EVER flash?
I take it the key fob doesn't work Try disconnecting the battery for 30 minutes and see if that will reset the alarm. You may need the key fob to reset.
Insert key into door barrel or ignition lock and turn key, whilst doing this press the unlock/lock button, the led on the dash should flash to indicate this has initialised the key to the car, then remove key and test operation of remote. If this fails then a new remote plus coding to the car by your dealership is needed
the keys needs to be initialised. put key in door lock or ignition barrel and press/hold the remote open button until led flashes on dash, release button and rremove key from lock, remote should now work
Sounds like the battery for sure. On German cars, especially high end ones... the battery is not usually replacable. You might try prying the fob open with a small flat screw driver or butter knife to see if the battery is soldiered to the board or if it can be removed. If it's soldiered you'll need a new fob. Contact the Merc dealer... this is the only place that can copy and program Merc keys... unless you can find a Merc specialty shop. Good luck.
Re-synchronize the FOB if the problem is with just one key.
1. Hold down both buttons simultaneously until the fob LED goes out. (10 seconds)
2. Release both buttons -- the LED should come on and stay on.
3. Press the larger fob button for a second, and the LED should flash.
IF re-synchronization doesn't work, you may have to replace the fob. Call customer service with your PIN (on the key-card that came with the keys). IF you don't have the PIN, then you need to call customeor service to confirm/register your ownership of the car.
If the keys are re-synchronized and it still doesn't work:
Re-program.
1. Re-synchronize as above, if you have not done so.
2. Turn the ignition on 3 times within 7 seconds. The red light above the odometer should light and stay on for 3 seconds.
3. Enter the PIN. Immediately after the red light goes out as per 2 above, switch on the ignition and count the number of flashes until it equals the number of the first digit on your PIN, then turn the ignition off, then on again. Do this for all four numbers.
4. What a pain, but if you get it wrong on a count, then you can restart by turning the ignition off for 10 seconds.
5. After the fourth digit, if the PIN is correct, the red light will stay on. Then you can re-test the fobs, and it should work.
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