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 location of the fuses in the passenger compartment: Chevrolet Avalanche (2001, 2002, 2003, 2004, 2005, 2006)
The location of the fuses in the passenger compartment: Chevrolet Avalanche (2001, 2002, 2003, 2004, 2005, 2006)

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

The location of the fuses in the engine compartment: Chevrolet Avalanche (2001, 2002, 2003, 2004, 2005, 2006)
The location of the fuses in the engine compartment: Chevrolet Avalanche (2001, 2002, 2003, 2004, 2005, 2006)

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
Instrument panel fuse box diagram: Chevrolet Avalanche (2001, 2002)
Instrument panel fuse box diagram: Chevrolet Avalanche (2001, 2002)

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

NameUsage
L BODYRetained Accessory Power Relay
LOCKPower Door Locks
DRV UNLOCKPower Door Lock Relay
LOCKPower Door Lock Relay
HVAC 1Climate Control System
CRUISECruise Control, Instrument Cluster
IGN 3Ignition, Power Seats
4WDFour-Wheel Drive System, Auxiliary Battery
CRANKStarting System
INT PRKInterior Lamps
L DOORPower Door Lock Relay
BRAKEAnti-Lock Brake System
RR WIPERNot Used
ILLUMInterior Lamps, Cargo Lamps
SEATPower Seat Circuit Breaker
TURNExterior Lamps, Turn Signals, Hazard Lamps
UNLOCKPower Door Locks
HTR A/CClimate Control System
WS WPRWindshield Wipers
IGN 1Ignition, Instrument Panel
AIR BAGAir Bag
MIR/LOCKPower Mirrors, Power Door Locks
DR LOCKPower Door Locks
PWR WDOPower Window Circuit Breaker
UNLOCKPower Door Lock Relay
IGN 0PRND321 Display, Odometer, VCM/PCM
SEO IGNSpecial Equipment Option, Ignition
SEO ACCYSpecial Equipment Option Accessory
RAP #1Retained Accessory Power Relay
RDO 1Audio System
RAP #2Rear Power Windows, Sunroof, Radio
Center instrument panel relay box
Center instrument panel relay box: Chevrolet Avalanche (2001, 2002)
Center instrument panel relay box: Chevrolet Avalanche (2001, 2002)

Center instrument panel relay box (2001-2002)

RelayUsage
SEOSpecial Equipment Option
HTD STHeated Seats
SPARENot Used
VANITYHeadliner Wiring
TRAILERTrailer Brake Wiring
PWR STPower Seats
SPARENot used
UPFUpfitter
PARK LAMPParking Lamps
FRT PRK EXPTNot Used
SPARE 2Not Used
PUDDLE LPPuddle Lamps
SL RIDENot Used
SPARE 3Not Used
INADV PWRInterior Lamps Feed
CTSY LPCourtesy Lamps
CEL PHONECellular Telephone Wiring
Engine Compartment
Under-hood fuse box diagram: Chevrolet Avalanche (2001, 2002)
Under-hood fuse box diagram: Chevrolet Avalanche (2001, 2002)

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

NameUsage
STUD #1Accessory Power/Trailer Wiring Feed/Load Leveling
ABSAnti-Lock Brakes
IGN AIgnition Switch
AIRA.I.R. System
RAP #1Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s)
IGN BIgnition Switch
RAP #2Retained Accessory Power/Rear Power Windows, Sunroof, Radio
STUD #2Accessory Power/Trailer Wiring Brake Feed
TRL R TRNRight Turn Signal Trailer Wiring
TRL L TRNLeft Turn Signal Trailer Wiring
IGN 1Ignition, Fuel Controls
INJ-BIgnition, Fuel Controls (Relay)
STARTERStarter (Relay)
PARK LPParking Lamps
FRT HVACClimate Control System
STOP LPExterior Lamps, Stoplamps
ECM 1VCM/PCM
CHMSLCenter High Mounted Stoplamp
VEH STOPStoplamps, Cruise Control
TRL B/UBackup Lamps Trailer Wiring
INJ-AFuel Controls, Ignition
RR HVACNot Used
VEH B/UVehicle Backup Lamps
ENG 1Engine Controls, Canister Purge, Fuel System
ETCElectronic Throttle Control
IGN EA/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. System
B/U LPBackup Lamps, Automatic Transmission Shift Lock Control System
ATCAutomatic Transfer Case
RR DEFOGRear Window Defogger, Heated Mirrors (Relay)
RTDNot Used
RR PRKRight Rear Parking Lamps
ECM BVCM/PCM
F/PMPFuel Pump (Relay)
O2 AOxygen Sensors
O2 BOxygen Sensors
LR PRKLeft Rear Parking Lamps
RR DEFOGRear Window Defogger, Heated Mirrors
HDLPHeadlamps (Relay)
TRL PRKParking Lamps Trailer Wiring
PRIMENot Used
RT HDLPRight Headlamps
DRLDaytime Running Lamps (Relay)
HTD MIRHeated Mirrors
LT HDLPLeft Headlamps
A/CAir Conditioning
AUX PWRCigarette Lighter, Auxiliary Power Outlets
SEO 2Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp
SEO 1Special Equipment Option Power, Aux Roof Mnt Lamp
DRLDaytime Running Lamps
A/CA/C (Relay)
FOG LPFog Lamps
FOG LPFog Lamps (Relay)
RADIOAudio System, Instrument Cluster, Climate Control System
CIGARCigarette Lighter, Auxiliary Power Outlets
RT TURNRight Turn Signals
BTSIAutomatic Transmission Shift Lock Control System
LT TURNLeft Turn Signals
FR PRKFront Parking Lamps, Sidemarker Lamps
W/W PMPWindshield Washer Pump
HORNHorn (Relay)
IGN CIgnition Switch, Fuel Pump, PRND321 Display, Crank
RDO AMPRadio Amplifier
HAZ LPExterior Lamps, Hazard Lamps
EXP LPSNot Used
HORNHorn
CTSY LPInterior Lamps
RR WPRNot Used
TBCBody Control Module, Remote Keyless Entry, Headlamps

2003, 2004, 2005, 2006

Instrument Panel
Instrument panel fuse box diagram: Chevrolet Avalanche (2003, 2004, 2005, 2006)
Instrument panel fuse box diagram: Chevrolet Avalanche (2003, 2004, 2005, 2006)

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

NameUsage
RR Wiper2003-2005:Rear Window Wiper Switch

2006: Not Used
SEO ACCYSpecial Equipment Option Accessory
WS WPRWindshield Wipers
TBC ACCYTruck Body Controller Accessory
IGN 3Ignition, Heated Seats
4WDFour-Wheel Drive System
HTR A/CClimate Control System
LCKPower Door Lock Relay (Lock Function)
HVAC 1Inside Rearview Mirror, Climate Control System
LT DRDriver’s Door Harness Connection
CRUISECruise Control
UNLOCKPower Door Lock Relay (Unlock Function)
RR FOG LPRear Fog Lamp (Export Only)
BRAKEAnti-Lock Brake System
DRIVER UNLOCKPower Door Lock Relay (Driver’s Door Unlock Function)
IGN 0Powertrain Control Module, Transmission Control Module
TBC IGN 0Truck Body Controller
VEH CHMSLVehicle and Trailer High Mounted Stoplamp
LT TRLR ST/TRNLeft Turn Signal/Stop Trailer
LT TRNLeft Turn Signals and Sidemarkers
VEH STOPVehicle Stoplamps, Brake Module, Electronic Throttle Control Module
BODYHarness Connector
RT TRLR ST/TRNRight Turn Signal/Stop Trailer
RT TRNRight Turn Signals and Sidemarkers
DDMDriver Door Module
AUX PWR 2, M/GATERear Cargo Area Power Outlets, Midgate
LCKSPower Door Lock System
ECC, TPMRear Electronic Climate Control, Tire Pressure Monitoring System (If Equipped)
TBC 2CTruck Body Controller
FLASH (2003-2005)
HAZRD (2006)
Flasher Module
CB LT DRSLeft Power Window Circuit Breaker
TBC 2BTruck Body Controller
TBC 2ATruck Body Controller
Center instrument panel relay box
Center instrument panel relay box: Chevrolet Avalanche (2003, 2004, 2005, 2006)
Center instrument panel relay box: Chevrolet Avalanche (2003, 2004, 2005, 2006)

Center instrument panel relay box (2003-2006)

Relay nameUsage
SEO2003-2005: Special Equipment Option

2006: Special Equipment Option/Off-road Lamps Harness Connector
TRAILERTrailer Brake Wiring
UPFITUpfitter (Not Used)
SL RIDE2003-2005: Ride Control Harness Connection

2006: Ride Control (Not Used)
HDLR 2Headliner Wiring Connector
BODYBody Wiring Connector
DEFOGRear Defogger Relay
HDLNR 1Headliner Wiring Connector 1
SPARE RELAYNot Used
CB SEATDriver and Passenger Seat Module Circuit Breaker
CB RT DOOR2003-2005: Right Power Window Circuit Breaker

2006: Rear Right Power Window, Passenger Door Module
SPARENot Used
INFO2003-2004: Infotainment Harness Connection

2005-2006: Not Used
Engine Compartment Fuse Box (2003-2005)
Under-hood fuse box diagram: Chevrolet Avalanche (2003, 2004, 2005)
Under-hood fuse box diagram: Chevrolet Avalanche (2003, 2004, 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)

NameUsage
GLOW PLUGNot Used
CUST FEEDAccessory Power
HYBRIDHybrid
STUD #1Auxiliary Power
MBECMid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWERFront Climate Control Fan
LBECLeft Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet—Rear Cargo Area and Instrument Panel
STUD 2Accessory Power/Trailer Wiring Brake Feed
ABSAnti-Lock Brakes
VSES/ECASVehicle Stability
IGN AIgnition Power
IGN BIgnition Power
LBEC 1Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARKParking Lamps Trailer Wiring
RR PARKRight Rear Parking and Sidemarker Lamps
LR PARKLeft Rear Parking and Sidemarker Lamps
PARK LPParking Lamps Relay
STARTERStarter Relay
INTPARKInterior Lamps
STOP LPStoplamps
TBC BATTTruck Body Controller Battery Feed
SUNROOFSunroof
SEO B2Off-Road Lamps
4WSVent Solenoid Canister/Quadrasteer Module Power
RR HVACRear Climate Control
AUX PWRAuxiliary Power Outlet — Console
IGN 1Ignition Relay
PCM 1Powertrain Control Module
ETC/ECMElectronic Throttle Control, Electronic Brake Controlle
INJ 1Ignition Coil, Fuel Injectors–Bank 1
INJ 2Ignition Coil, Fuel Injectors–Bank 2
IGN EConditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTDRide Control
TRL B/UBackup Lamps Trailer Wiring
PCM BPowertrain Control Module, Fuel Pump
F/PMPFuel Pump (Relay)
O2AOxygen Sensors
B/U LPBack-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOGRear Window Defogger
HDLP-HIHeadlamp High Beam Relay
PRIMENot Used
O2BOxygen Sensors
SIRSupplemental Inflatable Restraint System
FRT PARKFront Parking Lamps, Sidemarker Lamps
DRLDaytime Running Lamps (Relay)
SEO IGNRear Defog Relay
TBC IGN1Truck Body Controller Ignition
HI HDLP-LTHigh Beam Headlamp-Left
LH HIDLeft Hand High Intensity Discharge Lamps
DRLDaytime Running Lamps
IPC/DICInstrument Panel Cluster/Driver Information Center
HVAC/ECASClimate Control Controlle
CIG LTRCigarette Lighter
HI HDLP-RTHigh Beam Headlamp-Right
HDLP-LOWHeadlamp Low Beam Relay
A/C COMPAir Conditioning Compressor Relay
A/C COMPAir Conditioning Compressor
RR WPRRear Wiper/Washe
RADIOAudio System
SEO B1Mid Bussed Electrical Center, HomeLink, Rear Heated Seats
LO HDLP-LTHeadlamp Low Beam-Left
BTSIBrake Transmission Shift Interlock System
CRANKStarting System
LO HDLP-RTHeadlamp Low Beam-Right
FOG LPFog Lamp Relay
FOG LPFog Lamps
HORNHorn Relay
W/S WASHWindshield and Rear Window Washer Pump Relay
W/S WASHWindshield and Rear Window Washer Pump
INFOOnStar/Rear Seat Entertainment
RADIO AMPRadio Amplifier
RH HIDRight Hand High Intensity Discharge Lamp
HORNHorn Fuse
EAPElectric Adjustable Pedals
TRECAll-Wheel Drive Module
SBASupplemental Brake Assist
Engine Compartment Fuse Box (2006)
Under-hood fuse box diagram: Chevrolet Avalanche (2006)
Under-hood fuse box diagram: Chevrolet Avalanche (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)

NameUsage
GLOW PLUGNot Used
CUST FEEDAccessory Power
HYBRIDNot Used
STUD #1Auxiliary Power
MBECMid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWERFront Climate Control Fan
LBECLeft Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet—Rear Cargo Area and Instrument Panel
STUD #2Accessory Power/Trailer Wiring Brake Feed
ABSAnti-Lock Brakes
VSES/ECASAutomatic Level Control (ALC) Compressor
IGN AIgnition Power
IGN BIgnition Power
LBEC 1Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARKParking Lamps Trailer Wiring
RR PARKRight Rear Parking and Sidemarker Lamps
LR PARKLeft Rear Parking and Sidemarker Lamps
PARK LPParking Lamps Relay
STRTRStarter Relay
INTPARKInterior Lamps
STOP LPStoplamps
TBC BATTTruck Body Controller Battery Feed
SEO B2Off-Road Lamps
4WSVent Solenoid Canister/Quadrasteer Module Power
AUX PWRAccessory Power Outlet — Console
PCM 1Powertrain Control Module
ETC/ECMElectronic Throttle Control, Electronic Brake Controller
IGN EInstrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTDElectronic Suspension Control, Automatic Level Control (ALC) Exhaust
TRL B/UBackup Lamps Trailer Wiring
F/PMPFuel Pump (Relay)
B/U LPBack-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOGRear Window Defogger
HDLP-HIHeadlamp High Beam Relay
PRIMENot Used
AIRBAGSupplemental Inflatable Restraint System
FRT PARKFront Parking Lamps, Sidemarker Lamps
DRLDaytime Running Lamps Relay
SEO IGNRear Defog Relay
TBC IGN1Truck Body Controller Ignition
HI HDLP-LTDriver’s Side High Beam Headlamp
LH HIDLeft Hand High Intensity Discharge Lamps
DRLDaytime Running Lamps
RVCRegulated Voltage Control
IPC/DICInstrument Panel Cluster/Driver Information Center
HVAC/ECASClimate Control Controller
CIG LTRCigarette Lighter
HI HDLP-RTPassenger’s Side High Beam Headlamp
HDLP-LOWHeadlamp Low Beam Relay
A/C COMPAir Conditioning Compressor Relay
A/C COMPAir Conditioning Compressor
TCMBTransmission Control Module
RR WPRNot Used
RADIOAudio System
SEO B1Mid Bussed Electrical Center, Universal Home Remote System, Rear Heated Seat
LO HDLP-LTDriver’s Side Headlamp Low Beam
BTSIBrake Transmission Shift Interlock System
CRANKStarting System
LO HDLP-RTPassenger’s Side Headlamp Low Beam
FOG LPFog Lamp Relay
FOG LPFog Lamps
HORNHorn Relay
W/S WASHNot Used
W/S WASHNot Used
INFOOnStar/Rear Seat Entertainment
RADIO AMPRadio Amplifier
RH HIDRight Hand High Intensity Discharge Lamp
HORNHorn Fuse
EAPElectric Adjustable Pedals
TRECAll-Wheel Drive Module (If Equipped)
SBASupplemental Brake Assist
Engine Compartment Additional Fuse Block
Engine Compartment Additional Fuse Block: Chevrolet Avalanche (2005, 2006)
Engine Compartment Additional Fuse Block: Chevrolet Avalanche (2005, 2006)

Engine Compartment Additional Block (2005-2006)

FusesUsage
COOL/FANCooling Fan
COOL/FANCooling Fan Relay Fuse
COOL/FANCooling Fan Fuse
Relays
COOL/FAN 1Cooling Fan Relay 1
COOL/FAN 3Cooling Fan Relay 3
COOL/FAN 2Cooling Fan Relay 2

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.

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