2004-2008 Pontiac Grand Prix Fuse Box Diagram

The Grand Prix typically has multiple power outlets, which may be on separate fuses. Check the fuses in both main boxes:
Engine Compartment: Check for Fuse #34 (often a 15A fuse), which frequently controls one of the accessory power circuits.
Instrument Panel: Check for a fuse labeled P/Point No. 1 or Cigar Lighter (some reports cite Fuse #22 for the center console outlet). These are usually 15A or 20A fuses.

Fuses for the interior accessories (radio, HVAC blower, power windows, sunroof, door locks, etc.) are almost always located in the Instrument Panel Fuse Block under the dash.
Action: Consult the diagram under the fuse box lid or in your owner’s manual and check the 10A to 30A fuses specific to the failing component (e.g., “DR LK/TRUNK,” “SUN ROOF,” “RADIO”).

The starting circuit uses a relay and is protected by fuses.
Relay Check: The clicking sound you hear when turning the key often indicates a bad Starter Relay. This relay is located in the Engine Compartment Fuse Block. Swap it with another similar relay (like the horn or high beam relay) to test if the starter works.
Fuse Check: Also, check the high-amperage fuse that feeds the starter circuit (consult your diagram for the Starter Solenoid or Ignition fuse/circuit).

While you should check all large, main power fuses and relays in the Engine Compartment Fuse Block, intermittent power issues are often caused by:
Loose or Corroded Battery Cables/Grounds.
A faulty Ignition Switch (this vehicle generation had a recall).
Action: Check the main ignition-related fuses, but prioritize verifying the integrity of the battery connections and the main power wires going into the fuse block.