Check the interior electrical panel first if multiple cabin systems stop working, as most low-amperage circuits are grouped under the dashboard and in side panels near the driver area. The cover includes a numbered layout that links each slot to systems like lighting, infotainment, and seat controls.
The engine compartment power distribution unit, located near the battery, manages high-load circuits such as cooling fans, ignition supply, and braking systems. These positions typically range from 30A to 80A. Matching slot numbers with the printed layout avoids removing the wrong component.
Use the built-in puller to remove each protective element and inspect the metal strip inside. A break in the strip indicates failure, while a continuous connection means the issue is elsewhere. Always install the same amperage rating to maintain stable electrical operation and prevent system damage.
2018 Mercedes GLS 450 Fuse Box Diagram with Panel Locations and Circuit Details
Locate the cabin electrical panels under the dashboard and in the side trim of the driver area to access most low-current circuits such as lighting, infotainment, seat adjustment, and accessory power lines.
The engine compartment distribution unit near the battery handles high-load circuits including ignition supply, cooling fan motors, air suspension components, and braking systems, with ratings commonly ranging from 30A to 80A.
Each panel includes a printed layout inside the cover where numbered slots correspond to specific systems, allowing quick identification without removing multiple components.
- 5A–10A for control modules and interior lighting
- 15A–20A for power outlets, audio, and seat controls
- 25A–40A for blower motor and auxiliary systems
- 50A–80A for main power supply and high-load components
Use the puller tool stored in the panel to remove each element and inspect the internal strip; a visible break confirms failure, while an intact strip indicates the circuit path should be checked further.
Install only the same amperage rating shown on top of the component to maintain stable current flow and prevent damage to control units and wiring.
Interior Fuse Panel Locations and Circuit Identification for Cabin Systems
Check the cabin electrical module behind the side trim of the dashboard on the driver’s side; remove the cover to access labeled slots tied to interior electronics such as lighting, infotainment, and climate control. Use the legend printed on the panel cover to match each slot with its assigned circuit, noting amperage values typically ranging from 5A for control units to 30A for power outlets.
Map each slot carefully before replacement to avoid disabling multiple systems; interior lighting, seat adjustment motors, audio unit, and central locking are grouped in adjacent rows, while safety-related components such as airbag control modules are separated and marked distinctly. Always compare slot numbering with a verified layout reference, check for signs of overheating or corrosion, and replace blown elements only with identical rated components to maintain stable operation of cabin electronics.