1999 s320 starting problem sometimes - PeachParts Mercedes-Benz Forum

oldsinner111 · #1 07-31-2012, 05:45 AM

Yes my s320 maybe after 50 key on,will act funny.I have to insert key and hold in starting posistion for 10 seconds to start.After that no trouble till next 50 key on.
Been through 5 starters since November.Assuming it was starters.Could get a Bosch starter,they sent wrong starter.

Gilly · #2 07-31-2012, 07:32 AM

That still has the bladed type of key right, not EIS?

oldsinner111 · #3 07-31-2012, 08:44 AM

smart key looks like a w126 key

RichardM98 · #4 07-31-2012, 08:50 AM

Quote:

Originally Posted by oldsinner111

smart key looks like a w126 key

Probably smart key is failing. There is a small coil at the front edge of the circuit board in the key. If the key is dropped and you lose good connection, you get intermittent recognition by DAS. New smart keys seem to be running in the $200-$300 range.

oldsinner111 · #5 07-31-2012, 08:54 AM

this key is 2 years old.How often to change batteries?

RichardM98 · #6 07-31-2012, 10:01 AM

I change mine once a year but batteries only provide keyless access. They aren't involved in starting the car.

glenmore · #7 08-02-2012, 11:56 AM

Quote:

Originally Posted by RichardM98

Probably smart key is failing. There is a small coil at the front edge of the circuit board in the key. If the key is dropped and you lose good connection, you get intermittent recognition by DAS. New smart keys seem to be running in the $200-$300 range.

My daughter has a failed Smartkey for her 1999 C280 and now has 2 new keys that still give her occasional start problems. I am going to open up the old key and see if there is anything obvious that I might be able to repair.

Anyone open up one of these keys? Do you just carefully pry it open?

oldsinner111 · #8 08-02-2012, 01:36 PM

I let the MB parts man change my batteries.

Gilly · #9 08-02-2012, 05:03 PM

Quote:

Originally Posted by glenmore

Anyone open up one of these keys? Do you just carefully pry it open?

Look where the the emergency blade slips in to the key, there is a small tab you puch in on to release the "guts" of the key, like to replace the battery. Push in with a small screwdriver. Again the battery doesn't matter.