Check both interior and engine compartment power distribution panels and verify each protective element against its rated amperage before diagnosing any electrical issue. Using incorrect ratings can damage wiring and lead to repeated failures.
The cabin panel is typically located on the side of the dashboard or under it, supplying systems such as infotainment, instrument cluster, and interior lighting. The engine compartment unit handles higher current loads, including cooling fans, ignition supply, and braking system electronics.
Each slot corresponds to a specific circuit, with ratings usually ranging from 5A to 50A depending on load. Lower values support sensors and control modules, while higher values are assigned to motors and heating elements. Installing a higher-rated component than specified increases the risk of overheating.
Failures often appear as non-working lights, inactive displays, or loss of accessory power. Use a multimeter to check voltage on both sides of each slot and confirm continuity under load rather than relying on visual inspection alone.
If the original layout chart is missing, trace wiring colors and connector positions to rebuild the circuit map. This helps identify each line accurately and prevents incorrect placement during maintenance or replacement.
GMC Yukon Fuse Diagram and Electrical Layout Guide
Match each slot in the power distribution panel with its assigned circuit and amperage before replacing any protective element. Incorrect positioning can disable multiple systems, including lighting, ignition, and onboard electronics.
The vehicle uses separate panels for different load groups: an interior unit for dashboard electronics and accessories, and an engine compartment unit for high-current systems such as cooling fans, braking modules, and starter control. Each position corresponds to a dedicated circuit, and shared supply lines may affect several components at once.
Use a multimeter to check voltage on both sides of each slot under load conditions. A voltage drop across the element indicates failure, while no power suggests upstream issues such as wiring faults, damaged connectors, or control module problems.
Exact fuse box locations in cabin dashboard and engine compartment
Check the driver side dashboard edge first; the interior power distribution panel is mounted behind a removable cover accessible when the door is open. This position supports quick access to cabin circuits such as infotainment, interior lighting, and control modules.
To access the interior panel:
- Open the driver door fully
- Locate the side trim cover on the dashboard
- Pry it off gently using a plastic trim tool
- Expose the internal slot layout and labeling
The engine compartment unit is located near the battery housing and is protected by a sealed plastic cover with locking tabs. This area contains high-current protection elements and switching modules for systems like cooling fans, ignition supply, and braking electronics.
To reach the under-hood panel:
- Release the hood latch and secure it in the open position
- Find the rectangular cover adjacent to the battery
- Press or lift the locking tabs to remove the lid
- Inspect the internal layout printed on the underside of the cover
Use proper lighting when checking slot numbers and circuit labels, as markings may be small or worn. Avoid pulling on wiring harnesses while inspecting components to prevent connection damage.
After completing inspection or replacement, reinstall all covers securely to protect internal contacts from dust, moisture, and heat exposure.