S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

02 s430 key won’t turn.

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Old 10-10-2018, 03:08 AM
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2002 Benz s430
02 s430 key won’t turn.

Hey, my cluster died and I have repaired it and now it works. (The car Has been just sitting in a garage for 2 years with dead cluster). After the repair the key won’t turn in the ignition. Can I try to repair the key or will I need to buy it from the dealership? Or can it be other than the key itself. But the key won’t even unlock or lock the car with the remote and I already have changed the batteries in the key
Old 10-10-2018, 04:52 AM
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Originally Posted by S430l
Hey, my cluster died and I have repaired it and now it works. (The car Has been just sitting in a garage for 2 years with dead cluster). After the repair the key won’t turn in the ignition. Can I try to repair the key or will I need to buy it from the dealership? Or can it be other than the key itself. But the key won’t even unlock or lock the car with the remote and I already have changed the batteries in the key
it’s your main car battery in the trunk . It’s scone too weak and when its weak the key won’t turn in the electronic ignition. Put a brand new battery in . Don’t try to jump start you will blow the main fuses under the passenger carpet . If you already jumped it that may be why your key isn’t turning because you blew the main fuses

stsrt with a new battery and if that doesn’t work then pull up passenger carpet and remove the metal plate to get to the Main fuses

Last edited by tusabes; 10-10-2018 at 04:55 AM.
Old 10-10-2018, 08:56 AM
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Incidentally, the batteries in the key operate the RF (Radio Frequency) system to lock/unlock doors and trunk from a distance, and the IR (Infrared) system for locking/unlocking the doors and opening/closing windows and sunroof at close distances.
The batteries have no function in operating the ignition system - that is done by inductive power from the ECS.
Old 10-10-2018, 12:31 PM
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I have often charged the battery before testing and still nothing. I also have changed the fuse block under the front passenger carpet with new one. Aaaand still nothing.
Old 10-10-2018, 02:41 PM
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Originally Posted by S430l
I have often charged the battery before testing and still nothing. I also have changed the fuse block under the front passenger

carpet with new one. Aaaand still nothing.

I still say its your battery - from sitting so long it’s too weak even when charging it up , but it just won’t hold sufficient charge . If you don’t try a new battery your missing an essential step. If you have aaa they will bring a new battery to try for free if it doesn’t work

After you try a new battery , not a used one , the next step then you’re going to need a matched set of key shifter ecu and ignition switch taken from a donor car

all 4 parts must be from the same donor car as they Are coded only to work together . They sell matched sets on eBay for about $350 or you can get it from a local car being parted out . Make sure the year of car and .ecu is same part number as yours

Last edited by tusabes; 10-10-2018 at 02:44 PM.

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