I recently started working in a mercedes dealership as a trainee for the position of the diagnostic technincian. Can somebody help me understand how to read wiring diagrams? Thanks.

 

Google: how to read a car wiring diagram
Lots of videos that should help

 

Start with the symbol key it’s your map to every switch, relay, and control unit. Trace power from the fuse, through switches, to the component and then to ground. Mercedes uses thick lines for power distribution and thinner lines for control circuits. Pay close attention to component codes (like N for control modules) and pin numbers. Grab a known-good diagram for something simple, like a headlight circuit, and follow it on a real car with a test light. You’ll get the hang of it.

 

Wiring diagrams are not the first step used for troubleshooting faults.
You will notice every module has connection to power and data, on different power circuits and different data networks.

Modules operate within different environments.
Some modules keep running 24x7 non-stop (central Gateways) some modules receive full time power but remain off (headlights)... things can become rapidly confusing so you need focus to get billable results.

Luckily Mercedes are built to require predictable timely repairs.
This is when you will need to follow published procedures (SOP) to meet revenues targets with expensive parts.
Repeat calls are far more profitable than effective repairs.

• Low voltage
• misfiring
• leaks

need to remain active service items. Your employment is based on profits, not actual repairs. Modern MB's are built not to be trouble free.

With that being said focus on your future career with:

• DC-AC traction Converters,
• 3 phase motors with approximated sinewave

Respect that electric power can become hazardous without notice.

 

DO they not train @ this MB dealership?

 

Attached if it helps.

 

Thanks a lot. So that is how you see only the components that this specific car has? Because on a general wis diagram it shows you every possible component that can exist on the car and I didn't know how to find only the ones that a specific car has

 

Much appreciated 🤝