Mercedes Starfinder V3 Web ETM Wiring Diagrams
Viviano Dean
Star Wiring shows the wiring and electrical function diagrams for vehicles since about 1994, with some information on selected earlier models. Although nearly the same information appears in the Mercedes-Benz Workshop Information System (WIS), Star Wiring offers a unique and convenient user interface, called WebETM, that makes using this information easier. WebETM is more than an an electrical troubleshooting manual, going far beyond simple wiring diagrams. Additional information provided includes function diagrams, component locations, connector pin-outs and basic diagnostic information.
Access to Star Wiring is included with your STAR TekInfo subscription. Visit startekinfo.com to learn more about what is offered and to subscribe. XENTRY Diagnosis owners receive access to Star TekInfo as part of their data package. Once you have logged in to STAR TekInfo, click on the link to Star Wiring on the home page.
After searching for your selected chassis, you will have a choice: WebETM with STAR Finder, or just STAR Finder alone. In nearly all cases, you should select WebETM with STAR Finder, since this choice offers both the WebETM information and STAR Finder.
What is STAR Finder? It is a small application that has a simple purpose: To show you where an electrical component is located on the vehicle. Just click the component designation and pop-up window showing the component appears. Images can be enlarged, and more than one image for a component is frequently available.
After selecting the link to your desired WebETM with STAR Finder, a warning screen may remind you that certain models have high-voltage systems, meaning higher than 60-volts DC and/or 48-volts AC. Voltages like this can injure or kill you if you come into contact. Please read and follow the safety notes before proceeding.
If you know the designation of a component you need to work on, open the box and type the first letter of the component. This brings you right to that section of the drop-down, and saves the effort of having to scroll all the way down from A1 to your component.
Wiring diagrams are intuitive and generally understandable, but function diagrams need some explanation. Before networking entered the automotive world, each signal had its own wire. Today, networks can carry multiple signals, and a way was needed to show which signals went where. For example, how could you figure out how the outside temperature reading is delivered to the air conditioning control unit? Sure, you can guess it comes in on the CAN Bus, but from where? The function diagram spells this out.
To really understand these diagrams, we need to understand the many symbols used. The near-by chart shows examples of some common symbols used on a wiring diagram. Probably the most important symbols are wire, connector and component symbols, but in the end all of these symbols are important in their own way. We recommend studying these components and explanations to get the most from WebETM.
On the diagram, we see that the status of S9/1 (Brake Light Switch) is read in on a dedicated wire by the ESP control unit. The ESP control unit sends a message over CAN E1 to the Front SAM (N10/1). The Front SAM then sends a message via CAN B to N10/2, the Rear SAM. At the same time, the ESP control unit sends a message over a dedicated wire to N10/2, a redundant signal for this safety-critical function. The Rear SAM uses individual wires to switch the various tail lamp bulbs (or LEDs in this case) ON.
We then follow the jump-link in the function diagram to the Rear SAM wiring diagram, where we see that rear SAM connector N10/2x6HD pin 1 is where the 0.5mm2 black/red wire goes to E21x1 pin 2, the center stop lamp connector. Pin 1 of that connector goes to W7, the right rear wheel well ground point, which was found corroded from a bottle of soda that had spilled months ago. The ground was cleaned up and coated with some protection wax, and the problem cured.
That brings us to another important symbol: the functional flow arrows. Signals can either flow into a component (input) or flow out (output) of a component. Some signals flow both ways (such as a CAN bus) and so we see two arrows. These arrows do not show the direction of current flow, but instead were developed to help you better understand which pins are inputs and which are outputs. In this image, we see two bi-directional flow arrows, an input and an output.
Now that you have a clear understanding of how everything is connected together, you can start your diagnosis process: Verify the symptom, identify all the components that might be involved, eliminate the components that are working correctly (starting with the easiest ones to check) and finally perform tests to identify the exact cause. Perform your repairs, and think for a moment about how this fault could have possibly occurred. If something could cause that fault, also check for and eliminate that cause as well, to prevent a come-back. Finally, attempt to reproduce the fault again and, if it passes the tests, finalize the repair.
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Free Download Mercedes-Benz USA Starfinder webETM for Windows PC. It is a software tool providing wiring diagrams for Mercedes-Benz vehicles. Users can access detailed diagrams for electrical systems, aiding in diagnostics and repairs.
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The Mercedes-Benz USA Starfinder webETM is a beacon of knowledge for anyone exploring Mercedes-Benz vehicles. Its user-friendly interface, in-depth information, and dynamic updates cater to professionals and enthusiasts alike. Whether navigating interactive diagrams or exploring the comprehensive parts catalog, this tool is a must-have for anyone seeking to understand and maintain Mercedes-Benz vehicles.
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