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2005 Buick Century Cigarette Lighter Fuse: The Complete Diagnostic & Replacement Playbook

The cigarette lighter in your 2005 Buick Century suddenly stopped working? Before you visit a mechanic, check the fuse. In the vast majority of cases, a blown fuse is the sole culprit—and fixing it costs nothing but five minutes of your time. This guide walks you through everything you need to know, from locating the correct fuse to downloading a printable PDF reference for your glove box.

Key Takeaways

• Fuse location: The passenger-side instrument panel fuse block houses the cigarette lighter fuse on the 2005 Buick Century.
• Fuse rating: The lighter fuse is typically a 20-amp blade-type fuse (color-coded red).
• Fuse identifier: Refer to the fuse diagram on the cover of the under-dash fuse block or the owner's manual—search for "CIG" or "Lighter."
• Cost: A replacement 20-amp blade fuse costs $1–$3 at any auto parts store.
• Time: The entire diagnosis and replacement takes approximately 5–10 minutes.
• PDF reference: A printable fuse diagram PDF is available for download and storage in your vehicle.

Understanding the 2005 Buick Century Electrical System

Buick designed the 2005 Century with three primary fuse panels: the under-dash instrument panel fuse block, the engine compartment fuse block, and occasionally a rear trunk fuse panel on certain trim levels. The cigarette lighter circuit is routed through the under-dash panel, which is mounted behind a removable cover on the driver's side of the dashboard.

Each fuse in this block protects a specific accessory circuit. When current draw exceeds the fuse's ampere rating—whether from a malfunctioning lighter element or a shorted cable—the internal wire melts and opens the circuit. This is a safety feature, not a defect. Replacing the fuse restores function, provided the underlying cause is addressed.

Locating the Cigarette Lighter Fuse: Step-by-Step

Step 1: Locate the Under-Dash Fuse Block

• Kneel beside the driver's door and look at the lower portion of the dashboard.
• You will see a plastic cover with a diagram printed on its inner surface. This is the instrument panel fuse block.
• Remove the cover by pressing the retention tabs and pulling straight outward. Do not use tools—finger pressure is sufficient.

Step 2: Identify the Correct Fuse

• Consult the diagram on the removed cover or your owner's manual.
• Look for the label "CIG", "Lighter", or "Accessory Power Outlet."
• In the 2005 Buick Century, this is typically Fuse #19 (exact numbering may vary by production month—always verify against your diagram).
• The specified amperage is 20 amps. The fuse body will be red if it is the correct original rating.

Step 3: Remove and Inspect the Fuse

• Use the fuse puller tool provided in the engine-compartment fuse block (a small plastic tweezer-style tool).
• If the puller is missing, use needle-nose pliers with insulated handles.
• Hold the fuse up to a light source. A good fuse shows a continuous metal filament between the two prongs. A blown fuse shows a broken or melted filament.

Step 4: Replace the Fuse

• Insert a new 20-amp mini blade fuse (ANSI OT or equivalent) into the same slot.
• Press firmly until the fuse seats completely. Do not force it—if it does not fit, you have the wrong amperage or fuse type.
• Reattach the fuse block cover and test the lighter by inserting a known-good lighter element and turning it until it glows orange.

Fuse Specification Quick Reference

Specification	Detail
Vehicle	2005 Buick Century
Fuse Block	Under-dash instrument panel (passenger side)
Fuse Identifier	CIG / Lighter / Accessory Power Outlet
Fuse Number (Typical)	#19 (verify with your diagram)
Amperage Rating	20 amps
Fuse Type	Mini blade (ANSI OT)
Color Code	Red
Replacement Cost	$1 – $3 per fuse
Est. Replacement Time	5 – 10 minutes

Checklist: Cigarette Lighter Fuse Diagnosis

Use this checklist to systematically rule out common causes before replacing the fuse.

• [ ] Turn ignition to the "RUN" position (lighter requires power only when the key is on or in accessory mode).
• [ ] Visually inspect the lighter element for physical damage, darkening, or breakage.
• [ ] Test the lighter element with a multimeter on the continuity setting—expect near-zero resistance when cold.
• [ ] Locate the under-dash fuse block and remove the cover.
• [ ] Identify the CIG fuse using the diagram on the cover.
• [ ] Remove the fuse and inspect the filament for breakage.
• [ ] If blown, replace with an identical 20-amp mini blade fuse.
• [ ] If the new fuse blows immediately, do not keep replacing it—there is a short circuit downstream.
• [ ] Test the lighter element again after fuse replacement.
• [ ] Reinstall the fuse block cover securely.
• [ ] Store a spare 20-amp fuse in your glove compartment or center console.

When the Fuse Is Not the Problem

If you replace the fuse and the lighter still does not heat, investigate these additional failure points before assuming a wiring harness issue:

1. Faulty Lighter Element

The heating coil inside the lighter plug can fail independently of the fuse. Remove the element, let it cool completely, and test continuity with a multimeter. No continuity means the element must be replaced—aftermarket elements are widely available for under $10.

2. Corroded or Loose Connector

Behind the dash, the lighter wiring plugs into a connector that can corrode over time, especially in climates with road salt. Disconnect and inspect for green or white corrosion. Clean with electrical contact cleaner and reconnect firmly.

3. Blown Fuse Repeatedly

If a fresh 20-amp fuse blows within seconds or minutes, a short to ground exists in the circuit. Common sources include a pinched wire beneath the dash, a damaged insulation sheath contacting the vehicle frame, or a faulty aftermarket accessory wired into the same circuit. This condition requires a multimeter and patience—you may need a professional technician.