Q: DTC Code interpretation

asked by on

2009 Benz C300 4DR Sports automatic transmission code scanner Yes

Issues: 1. "Auto lights inoperative" error message 2, Interior buttons has no lights during a night drive.

DTC errors 1. A25f54 2. D41e00

Code findings 1. circuit 58d off and 0mA consumption 2. ambient illuminationoff 3. headlamp switch off delay off

Questions to experts 1. is circuit 58d off means faulty? what and where is circuit 58d parts if this need to be replaced is your recoomendation 2, ambient illumination off is faulty ? then how to fix? 3. head lamp switch off delay off is faulty? then how to fix? 4. command center (Radio) under engineer mode, I can change illumination from 0-100%, but then I do not know to how to save the setting, how do I save the current setting (100% illumination ) when I get out of engineer mode? 5. Auto lights inoperative" error message---how do I fix this? 2, Interior buttons has no lights during a night drive.--- how do I fix this? is this error due to all these faulty codes tha

My car has 75000 miles.
My car has an automatic transmission.

It looks like you’re using the Star Diagnostic system. So you are getting Mercedes Proprietary codes. The codes may not be published in a place where you can access them without going through Mercedes. They guard a lot of their intellectual property pretty jealously. As for Circuit 58D, it is not a component, it is the instrument illumination circuit itself; the network of wires and devices that run through the car lighting up things like window switches. In the old days I would say replace the dimmer switch, but things are much more complicated these days. The only thing left for you is to get a wiring diagram and a multimeter and start testing. You will find the Circuit 58D terminals on several devices including the light switch and the lighting module. If you don’t want to spend your day upside down under the dashboard. You can contact Your Mechanic to have a technician come out to your home or office to check out your electrical system and tell you what its going to take to fix it.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. DTC Code interpretation

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Bad interior in my truck

You are not alone in having issues with plastic parts of the interior or exterior of GM vehicles. The cracks in your dash panel and door handles breaking are common, but no recalls were found for any of the trim...

Q: What is the cost of replacing spark plugs in a 2006 Mercedes Benz SLK 280?

You can obtain the exact written quote that you desire, and schedule the repair to suit your needs, by simply visiting YourMechanic’s spark plug service request page. Once on that page, please click on "Get a Quote" and enter your...

Q: I had the blower motor replaced, it worked for the last week. Today the fans were kicking on and off then off completely.

This may be related to a faulty blower motor or blower motor relay. Occasionally, the blower motor itself will wear out or become faulty working intermittently as the brush contacts inside the motor wear out. The blower motor relay supplies...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.