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Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53846
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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I was driving my slk r170 when all the lights on the dash

Customer Question

I was driving my slk r170 when all the lights on the dash came on then then went out. I stopped the car, turned it off then restarted it a couple of times. On the third try the starter motor did nothing.
JA: Have you checked the fuses? The dashboard bulbs?
Customer: all fuses have been checked.
JA: What is the model/year of your Mercedes?
Customer: 2002 slk 200 compressor.
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: checked grounds.fuses, and most connections.
JA: Anything else you want the mechanic to know before I connect you?
Customer: received P0500 and P0600 error codes. The diag tool will not clear the codes. It does not appear to be communicating with the ECU.
Submitted: 2 months ago.
Category: Mercedes
Expert:  Marty replied 2 months ago.

Hi, my name is***** would have the battery tested to be sure there is adequate voltage. If the battery needs charging I would charge the battery and see if it will start. If the car starts you should test the output of the alternator. If the battery checks good I would substitute a known good K40 relay. The K40 relay powers the control units and can cause these symptoms if it fails.

Let me know if you have any questions.