Access the panel under the dashboard on the driver’s side and inspect the labeled circuit chart printed on the cover–this is the fastest way to identify the exact slot responsible for headlights, fuel pump, or interior electronics. The layout is split into rows with clearly numbered positions, where each cavity corresponds to a protected circuit rated in amps, typically ranging from 10A to 60A. Larger components such as blower motors and ABS modules are connected through higher-capacity relays positioned separately from smaller protective elements.
Inside the engine compartment, a secondary distribution unit houses high-current links, including connections for ignition, cooling fans, and charging system. This section uses square relays and cartridge-style protectors instead of the smaller blade types found inside the cabin. Pay attention to the legend etched into the plastic cover; it maps each slot to functions like PCM power, starter relay, or radiator fan control.
When tracing a malfunction, match the symptom to a specific circuit rather than pulling components randomly. For example, a non-working power window often corresponds to a 25A or 30A slot in the interior panel, while a no-start condition may involve ignition relay positions in the under-hood unit. Use a multimeter to verify continuity across each element instead of relying solely on visual inspection, since micro-cracks in conductive strips are not always visible.
Keep spare rated elements in the glove compartment and replace only with identical amperage values. Installing a higher-rated piece can damage wiring insulation and control modules. The factory layout grouping ensures that related systems–lighting, drivetrain control, and comfort features–are clustered logically, which reduces diagnostic time when following the printed scheme.
2001 Pontiac Bonneville Fuse Box Diagram: Practical Guide
Check the interior electrical panel under the dashboard on the driver’s side and match each slot with the amperage rating printed on the cover–15A for the radio circuit, 10A for instrument cluster, 20A for power outlets, and 30A for HVAC blower; always replace with identical ratings to avoid wiring damage and test continuity with a multimeter before installing a new insert.
The engine compartment power distribution unit, located near the battery, controls high-load systems such as cooling fans (typically 40A), ABS module (60A), and ignition feed (often 50A); use the lid’s layout chart to trace each relay and slot position, then verify voltage presence using a test light while the ignition is in ON position, as some circuits remain inactive otherwise. If multiple components fail simultaneously–like headlights, horn, and central locking–inspect shared lines and grounding points rather than swapping inserts blindly, since corrosion at grounding studs near the fender is a frequent cause of intermittent faults in this model.
Exact Location of Interior and Engine Compartment Fuse Boxes in 2001 Pontiac Bonneville
Open the driver’s door and inspect the side edge of the dashboard panel–this is where the interior electrical module is mounted, hidden behind a removable plastic cover. Pull the cover from the notch at the bottom; no tools are required. The panel sits vertically, facing the door opening, making access straightforward without removing trim pieces or lowering the steering column.
Inside the cabin unit, components are arranged in tight rows with labeled slots. To reach them without obstruction, slide the driver’s seat fully back and tilt the steering wheel upward. This positioning prevents hand interference when extracting or inserting relays and protective elements. A small puller tool is often clipped inside the cover, simplifying removal.
The engine compartment unit is placed under the hood on the passenger side, near the strut tower and coolant reservoir. Release the hood latch, secure the hood, then locate a rectangular black housing with a snap-on lid. Press the locking tabs on both sides and lift the cover straight up. Inside, high-amperage protection and key relays are grouped separately from the cabin set, with clear molded markings indicating their positions.
- Interior panel: driver-side dashboard edge, accessed with door open
- Engine bay panel: passenger-side, close to suspension mount
- No screws required for either cover removal
- Use the built-in puller for safe extraction
- Always reseat covers firmly to protect from dust and moisture