Chevrolet Avalanche (GMT800) 2001-2006 fuse box and relay Diagrams

The Chevrolet Avalanche (2001-2006) on the GMT800 platform combines the utility of a pickup truck with the comfort of an SUV. Key features include its versatile midgate, allowing the cargo area to expand into the passenger cabin, along with powerful V8 engine options and a smooth, stable ride. The Avalanche also offers advanced features like automatic climate control, power windows, and premium audio systems, all reliant on its electrical system.

The fuse box, located under the hood and inside the cabin, safeguards crucial systems like the headlights, power seats, and air conditioning by cutting off power if an electrical surge occurs. If a fuse blows, replacing it restores functionality to the affected system.

The relays manage high-current operations such as the fuel pump, cooling fan, and starter motor. These relays act like switches to ensure that the truck’s major electrical components work efficiently. A malfunctioning relay can cause issues like starting problems or a non-operational cooling system.

Maintaining the fuse box and relays is essential to ensuring the Avalanche’s electrical systems run smoothly, keeping its many features functioning properly for both utility and comfort.

MUST READ: DYI – How to Check Car Fuses?

(2001-2006) Chevrolet Avalanche (GMT800) fuse box and relay with Diagram

WARNING

• Never replace a fuse with one that has a higher amperage rating.
• A fuse with a too-high amperage could damage the electrical part and cause a fire.
• On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
• If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
• Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

Chevrolet Avalanche (GMT800) 2001-2006 fuse assignment

• Cigar lighter / power outlet fuses in the Chevrolet Avalanche are located in the Engine Compartment fuse box. 2001-2002 – see fuses “AUX PWR” and “CIGAR”. 2003-2006 – see fuses “AUX PWR” (Auxiliary Power Outlet – Console), “CIG LTR” (Cigarette Lighter) in the Engine Compartment fuse box and fuse “AUX PWR 2, M/GATE” (Rear Cargo Area Power Outlets, Midgate) in the Instrument Panel Fuse Box.

Year of production: from 2001, 2002, 2003, 2004, 2005, 2006

Fuse Box Location

Instrument Panel

The fuse box is located on the side of the instrument panel, on the driver’s side, behind the cover.

Center instrument panel relay box

The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.

Engine Compartment

Engine Compartment Additional Fuse Block (if equipped)

The auxiliary electric cooling fan fuse block is located in the engine compartment on the driver’s side of the vehicle next to the underhood fusebox.

Fuse box diagrams

2001, 2002

Instrument Panel

Assignment of the fuses in the instrument panel (2001-2002)

Center instrument panel relay box

Center instrument panel relay box (2001-2002)

Engine Compartment

Assignment of the fuses and relay in the engine compartment (2001-2002)

2003, 2004, 2005, 2006

Instrument Panel

Assignment of the fuses in the instrument panel (2003-2006)

Center instrument panel relay box

Center instrument panel relay box (2003-2006)

Engine Compartment Fuse Box (2003-2005)

*1 — Gasoline Engine and Fuel Injection Rail #2;
*2 — Gasoline Engine and Fuel Injection Rail #1;
*3 — Gasoline Engine; Oxygen Sensors;
*4 — Gasoline Engine; Oxygen Sensors;
*5 — PCM Ignition.

Assignment of the fuses and relay in the engine compartment (2003-2005)

Engine Compartment Fuse Box (2006)

*1 — Gasoline Engine and Fuel Injection Rail #2;
*2 — Gasoline Engine and Fuel Injection Rail #1;
*3 — Gasoline Engine; Oxygen Sensors;
*4 — Gasoline Engine; Oxygen Sensors;
*5 — Ignition 1;
*6 — Powertrain Control Module, Fuel Pump;
*7 — Rear Climate Control;
*8 — Sunroof.

Assignment of the fuses and relay in the engine compartment (2006)

Engine Compartment Additional Fuse Block

Engine Compartment Additional Block (2005-2006)

Conclusion

For owners and enthusiasts of classic Chevrolet Avalanche (GMT800) 2001-2006, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Chevrolet’s craftsmanship and innovation in the automotive industry during that era.