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06 S430 Key Wont Turn

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

06 S430 Key Wont Turn

 
Old 04-08-2018, 06:13 PM
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W200 S430
06 S430 Key Wont Turn

Hi,

I have a 2006 S430 and the key will not turn in the ignition.

A little back story…I returned from vacation last Monday and the car struggled to start. The key would turn, but the starter would not engage (only click). I shut off the headlights, interior lights, stereo, climate control and it just barely started. At that point, I should have immediately bought a new battery. Instead, I decided to continue to drive it and research batteries online for a few days. The car continued to start just fine until Thursday. I got in the car on Thursday to go to lunch and the key would not even turn. I attempted to jump the battery multiple times and the key still would not turn. I purchased and installed a new battery and it still wouldn’t turn. I replaced the batteries in the key fob too and nothing. I believe the key infrared is working since I can still roll up/down the windows via the key fob from the exterior.

I had the car towed and it is now sitting in my garage. I am fairly handy…I restored a classic car myself and have a garage full of tools. Where should I start? Any help is greatly appreciated.

Thanks,
Joe G.
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Old 04-09-2018, 12:38 AM
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Probably blew the main fuse under the passenger carpeting

https://youtu.be/Jb_7E-Z5D7g
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silver06w220 (04-17-2018)
Old 04-09-2018, 08:10 AM
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2003 S430
Interesting...
I posted the following info yesterday, and it disappeared.

"Possibly blew one of the main fuses - one under the trunk lining near the battery, others under the passenger floor carpet."
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Old 04-18-2018, 12:08 AM
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Thanks for the replies!

I wanted to follow-up since the problem is now resolved.

I checked all the fuses and they all looked good. I removed the EIS and verified that it was getting power (which it was). I contacted a gentleman from EBay out of California who repairs EIS modules. He verified my suspicion which was a faulty EIS or key. He quoted me $400 to repair the EIS.

At that point, I decided that I would start by replacing the key. I figured a spare key is a good idea anyway. The dealer quoted me $306 for a new key (including new blade). Unfortunately, they needed the car to release the key and “program”. They suggested I contact Mercedes road side assistance and informed me it would be free since it was being towed to the dealer. By the way, there is a video on YouTube which outlines how to manually force the car into neutral.

Anyway, the new key arrived today and the mighty W220 fired right up!!!!
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Old 04-18-2018, 01:40 AM
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Thanks for posting the follow up and fix

key failures are very rare it's usually one of the other components
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Old 04-19-2018, 11:12 PM
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W209, W124
Bad key can usually be fixed.
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