CLK 500 Help!
Thread Starter
Newbie
Joined: Feb 2017
Posts: 14
Likes: 1
2004 CLK 500
CLK 500 Help!
I have an 04 clk500 that's having no start no crank issues.
The key unlocks the ignition lock, and turns to the start position.
The interior accessories and headlights all work.
The battery tests at 12.4v.
I've checked every fuse, the starter wires, and changed key batteries.
The instrument cluster does not come on at all.
No clicks or anything when turned to the start position.
It seems like there is no power to the ecu.
All the wires, and connections appear clean and unbroken.
This just happened without warning.
No faults or idiot lights beforehand.
Any ideas?
The key unlocks the ignition lock, and turns to the start position.
The interior accessories and headlights all work.
The battery tests at 12.4v.
I've checked every fuse, the starter wires, and changed key batteries.
The instrument cluster does not come on at all.
No clicks or anything when turned to the start position.
It seems like there is no power to the ecu.
All the wires, and connections appear clean and unbroken.
This just happened without warning.
No faults or idiot lights beforehand.
Any ideas?
Member
Joined: Dec 2016
Posts: 247
Likes: 24
2009 CLK 350
As Rodney says, ECU not active until engine starts. You should check the starter circuits. I would start with the ignition switch and work from there. The circuits come together st the starter solenoid. There should be 12 V directly from the battery at the thick cable and 12 V from the ignition switch at the thinner cable when the key is moved to the start position. Not terribly complicated, but easiest with the help of a friend.
If the the solenoid connections show the correct voltages you have a defective starter/solenoid.
If the the solenoid connections show the correct voltages you have a defective starter/solenoid.
Last edited by Anker; Feb 23, 2017 at 07:26 PM. Reason: Missing information
Thread Starter
Newbie
Joined: Feb 2017
Posts: 14
Likes: 1
2004 CLK 500
I appreciate the help!
I'll test the starter hot leads this weekend and let you know what I find.
The thing that has me confused is the instrument cluster not coming on. Normally, it illuminates so you can interface with the computer.
I get nothing in an key position.
I'll test the starter hot leads this weekend and let you know what I find.
The thing that has me confused is the instrument cluster not coming on. Normally, it illuminates so you can interface with the computer.
I get nothing in an key position.
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Thread Starter
Newbie
Joined: Feb 2017
Posts: 14
Likes: 1
2004 CLK 500
Hooked up the multimeter to watch the battery when I turn the key to start.
The car actually started!
Now, I still have no instruments or gauges, and the wipers don't work!
I'm thinking maybe a couple overlapping issues?
Or, could it still be a key switch issue?
The car actually started!
Now, I still have no instruments or gauges, and the wipers don't work!
I'm thinking maybe a couple overlapping issues?
Or, could it still be a key switch issue?
Member
Joined: Dec 2016
Posts: 247
Likes: 24
2009 CLK 350
Cranking voltage is on the low side, indicating a weak battery.
When you say mean, is that when the car is shut off? If it is, its also on the low side.
The running voltage is just right, indicating that the alternator and voltage regulator are working fine.
Personally I would remove the battery and take it to a battery shop and have it tested before doing any further diagnostics. When replacing the battery make sure everything is clean and tight. A post and terminal cleaner is a cheap investment.
When you say mean, is that when the car is shut off? If it is, its also on the low side.
The running voltage is just right, indicating that the alternator and voltage regulator are working fine.
Personally I would remove the battery and take it to a battery shop and have it tested before doing any further diagnostics. When replacing the battery make sure everything is clean and tight. A post and terminal cleaner is a cheap investment.
Thread Starter
Newbie
Joined: Feb 2017
Posts: 14
Likes: 1
2004 CLK 500
Yeah, 12.4 resting, or shut off.
I will have it load tested.
It's probably a good idea just to get a new one.
We had an unusually cold winter. That probably didn't help.
Thanks for the response.
I'll let you know what happens.
I will have it load tested.
It's probably a good idea just to get a new one.
We had an unusually cold winter. That probably didn't help.
Thanks for the response.
I'll let you know what happens.
MBworld Guru
Joined: Dec 2009
Posts: 10,782
Likes: 1,011
NO LONGER ACTIVE
This could be an issue with the EIS or the key. A key that won't properly "handshake" with the EIS can act like this, too. But first - fix the voltage issues - 12.6 at rest, no less than 11v during cranking.
Thread Starter
Newbie
Joined: Feb 2017
Posts: 14
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2004 CLK 500
Went ahead and bought a new battery. The old one was a bit week under load
New one installed, car starts right up, but still no gauges.
This time the wipers came on for a brief second to park themselves in the up position.
Things are getting weird!
New one installed, car starts right up, but still no gauges.
This time the wipers came on for a brief second to park themselves in the up position.
Things are getting weird!
MBworld Guru
Joined: Dec 2009
Posts: 10,782
Likes: 1,011
NO LONGER ACTIVE
You need a spare. Before spending any money on a service visit, I'd get a spare key. You need one anyhow, and it may be that your key is defective. Got to "parts" and get an "additional" key.
Member
Joined: Apr 2016
Posts: 231
Likes: 6
From: Alexandria, VA
2005 CLK500
