Check the driver-side dashboard panel first; remove the side cover to access the interior electrical center where numbered slots correspond to specific systems such as lighting, radio memory, and instrument cluster.
Interior circuits typically include 10A protection for gauges and airbag module, 15A for turn signals and wipers, and 20A for power outlets. Each slot is labeled on the rear cover with short codes, helping match the correct circuit before removal.
Open the hood and locate the main power distribution unit near the battery; this section handles higher current loads and contains larger cartridge-style elements rated between 30A and 60A for systems like cooling fans and ignition feed.
If a circuit stops functioning, inspect the corresponding slot for a broken metal strip and verify connected components such as switches or motors. Repeated failure indicates wiring damage or overload rather than a simple blown insert.
2002 Avalanche Fuse Diagram with Panel Locations and Circuit Details
Check the under-hood power distribution center first, as it contains high-amperage links for the starter motor, cooling fans, and charging system; identify each slot using the molded cover map and match amperage values before replacement.
The cabin-mounted electrical block sits on the driver side dashboard edge behind a removable cover; it handles low-current circuits such as interior lighting, radio, and accessory outlets, typically rated between 10A and 25A.
Each position is numbered in rows; upper rows often supply ignition-related components, while lower rows are reserved for comfort systems like HVAC controls and power windows.
Under-hood layout includes large cartridge-style elements ranging from 30A to 60A; these protect the alternator output, ABS module, and main battery feed lines.
Relay placements are grouped near the front edge of the engine compartment panel; common units control fuel pump operation, headlamp switching, and horn activation, and should be checked alongside protective links during diagnostics.
For troubleshooting, compare slot numbering with the cover legend and verify continuity using a multimeter; avoid visual checks only, as some elements fail internally without visible damage.
Wiring harness routing connects both panels through a central junction, so a failure in one section can affect multiple systems; tracing circuits using color-coded wires improves accuracy.
Always match replacement ratings exactly, such as 15A for accessory ports or 20A for wiper circuits, to prevent overheating or repeated failure under load.
Interior Fuse Panel Slot Numbers and Circuit Assignments
Locate the cabin electrical block on the driver-side dash end and use the printed numbering grid to match each slot with its assigned circuit before testing or replacing any element.
Typical slot assignments follow a structured layout where upper positions handle ignition-switched circuits and mid-range positions support cabin electronics; lower rows often supply auxiliary features and constant battery feeds.
- Slot 1–3: ignition switch feed, instrument cluster, warning indicators (10A–15A)
- Slot 4–6: radio unit, interior lights, retained accessory power (15A–20A)
- Slot 7–9: power outlets, cigar lighter, data link connector (20A)
- Slot 10–12: HVAC control head, blower relay signal, climate sensors (10A–15A)
Circuits for door locks and window motors are grouped together and typically protected by 20A to 30A inserts; these positions are often located along the lower edge for easier access during service.
Check amperage markings stamped on each component and compare with panel labeling; mismatched ratings can lead to repeated failure or overheating of wiring paths behind the dashboard.
Use a multimeter to confirm voltage at both terminals of each slot while the circuit is active; a single-sided reading indicates a blown link, while no voltage suggests upstream supply interruption.