Locate the interior electrical panel under the dashboard on the driver side and compare each slot number with the cover chart to identify circuits such as lighting, radio, and climate control.
Check amperage markings printed on each blade component, which typically range from 5A for low-load electronics to 30A for power-operated systems like windows and seat motors.
Inspect links by removing them with a puller and looking for a broken metal strip; replace only with the same rating and position to avoid overheating and malfunction of connected components.
1990 Cadillac DeVille Fuse Box Diagram with Locations and Circuit Details
Check the interior panel under the left side of the dashboard and the engine compartment unit near the battery, then match numbered slots with the printed layout to identify circuits such as headlamps, ignition feed, cooling fan, and audio system.
The cabin section includes lower-rated elements like 5A for dashboard indicators, 10A for interior lights and radio memory, 15A for wipers, and 25A for power windows, while the under-hood distribution uses higher ratings such as 30A for fan motors, 40A for ABS supply, and 50A for main ignition line, with relays placed alongside to control high-load components.
Interior fuse box layout with slot numbers and amperage ratings
Open the driver-side lower dash panel and read the numbering printed on the cover to align each slot with its assigned circuit before removing any component.
The panel is arranged in horizontal rows where lower positions usually handle accessory systems, while upper rows connect to lighting and control modules; each cavity has a stamped number corresponding to the legend.
Typical amperage distribution inside the cabin includes low-load and medium-load circuits grouped separately for easier identification during inspection.
- Slot 1 – 10A – radio memory and clock
- Slot 2 – 15A – windshield wipers
- Slot 3 – 20A – power outlet
- Slot 4 – 25A – window motors
- Slot 5 – 5A – instrument cluster indicators
Each metal link inside the plastic housing should remain intact; a visible break or darkened section indicates failure and requires replacement with the same rating.
Do not install a higher amperage unit, as wiring behind the panel is sized for specific current limits and may overheat under excess load.
- Turn ignition off before removal
- Use puller tool to extract the component
- Compare rating printed on top
- Insert replacement into the same numbered slot
After installation, verify operation of the affected system such as lights, radio, or windows to confirm proper circuit restoration.