The Cadillac Escalade GMT 800, produced from 2001 to 2006, was a full-size luxury SUV known for its robust performance, spacious interior, and upscale features. Its electrical system, including the fuse box and relay components, played a crucial role in ensuring the vehicle’s functionality and reliability.
In the Cadillac Escalade GMT 800, the fuse box contained multiple fuses that protected various electrical circuits throughout the vehicle. These circuits powered essential components such as the engine control module, lighting systems, climate control, entertainment features, and more. Fuses were designed to interrupt the circuit in the event of an electrical overload or short circuit, preventing damage to associated systems.
Relays in the Cadillac Escalade GMT 800 served as electrically operated switches that controlled high-current circuits. They facilitated the activation and deactivation of functions such as the starter motor, fuel pump, air conditioning compressor, and power windows or seats. Efficient relay operation ensured smooth power distribution and reliable performance of the vehicle’s electrical systems.
Regular inspection and maintenance of the fuse box and relays were essential to ensure the Cadillac Escalade GMT 800 operated smoothly. This included checking fuses for signs of wear or damage, ensuring relay connections were secure, and promptly addressing any electrical issues that arose. Proper care of these components helped maintain the vehicle’s electrical integrity, enhancing safety and driving satisfaction in the Cadillac Escalade GMT 800 (2001-2006).
MUST READ: DYI – How to Check Car Fuses?
(2001-2006) Cadillac Escalade GMT 800 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.
Cadillac Escalade GMT 800 2001-2006 fuse assignment
- Cigar lighter / power outlet fuses in the Cadillac Escalade are located in the Instrument panel fuse box (2003-2006 – see fuses “AUX PWR 2” / “AUX PWR 2, M/GATE”) and in the Engine compartment fuse box (2001-2002 – see fuses “AUX PWR” and “CIGAR”; 2003-2006 – see fuses “AUX PWR” and “CIG LTR”).
Year of production: 2001, 2002, 2003, 2004, 2005, 2006
Passenger compartment fuse box
Fuse Box Location
It is located on the driver’s side of the instrument panel, behind the cover.
Fuse box diagram (2001-2002)
Assignment of the fuses and relays in the instrument panel (2001-2002)
| Name | Description |
|---|---|
| L BODY | Retained Accessory Power Relay |
| LOCK | Power Door Locks |
| DRV UNLOCK | Power Door Lock Relay |
| LOCK | Power Door Lock Relay |
| HVAC 1 | Climate Control System |
| CRUISE | Cruise Control, Instrument Cluster |
| IGN 3 | Ignition, Power Seats |
| 4WD | Not Used |
| CRANK | Starting System |
| INT PRK | Interior Lamps |
| L DOOR | Power Door Lock Relay |
| BRAKE | Anti-Lock Brake System |
| RR WIPER | Rear Window Wiper |
| ILLUM | Interior Lamps |
| SEAT | Power Seat Circuit Breaker |
| TURN | Exterior Lamps, Turn Signals, Hazard Lamps |
| UNLOCK | Power Door Locks |
| HTR A/C | Climate Control System |
| WS WPR | Windshield Wipers |
| IGN 1 | Ignition, Instrument Panel |
| AIR BAG | Air Bag |
| MIR/LOCK | Power Mirrors, Power Door Locks |
| DR LOCK | Power Door Locks |
| PWR WDO | Power Window Circuit Breaker |
| UNLOCK | Power Door Lock Relay |
| IGN 0 | PRND321 Display, Odometer, VCM/PCM |
| SEO IGN | Special Equipment Option, Ignition |
| SEO ACCY | Special Equipment Option Accessory, Cellular Telephone |
| RAP #1 | Retained Accessory Power Relay |
| RDO 1 | Audio System |
| RAP #2 | Rear Power Windows, Sunroof, Radio |
Fuse box diagram (2003-2006)
Assignment of the fuses and relays in the instrument panel (2003-2006)
| Name | Description |
|---|---|
| RR Wiper | Rear Window Wiper Switch |
| SEO ACCY | Special Equipment Option Accessory |
| WS WPR | Windshield Wipers |
| TBC ACCY | Truck Body Controller Accessory |
| IGN 3 | Ignition, Heated Seats |
| 4WD | Four-Wheel Drive System |
| HTR A/C | Climate Control System |
| LOCK | Power Door Lock Relay (Lock Function) |
| HVAC 1 | Inside Rearview Mirror, Climate Control System |
| L DOOR (LT DR) | Driver’s Door Harness Connection |
| CRUISE | Cruise Control |
| UNLOCK | Power Door Lock Relay (Unlock Function) |
| RR FOG LP | 2003-2005: Rear Fog Lamp (Export Only) 2006: Not Used |
| BRAKE | 2003-2005: Anti-Lock Brake System 2006: Brake Switch |
| DRIVER UNLOCK | Power Door Lock Relay (Driver’s Door Unlock Function) |
| IGN 0 | 2003-2005: PCM, TCM 2006: Brake Transmission Shift Interlock, Powertrain Control Module, Transmission |
| TBC IGN 0 | Truck Body Controller |
| VEH CHMSL | Vehicle and Trailer High Mounted Stoplamp |
| LT TRLR ST/TRN | Left Turn Signal/Stop Trailer |
| LT TRN | Left Turn Signals and Sidemarkers |
| VEH STOP | Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module |
| RT TRLR ST/TRN | Right Turn Signal/Stop Trailer |
| RT TRN | Right Turn Signals and Sidemarkers |
| BODY | Harness Connector |
| DDM | Driver Door Module |
| AUX PWR 2 (AUX PWR 2, M/GATE) | 2003-2005: Rear Cargo Area Power Outlets 2006: Instrument Panel Outlets, Rear Cargo Area Power Outlets |
| LOCKS (LCKS) | 2003-2005: Power Door Lock System 2006: Rear Doors and Liftgate Power Lock Relay Feed |
| ECC (ECC TPM) | 2003-2005: Rear Electronic Climate Control, Liftgate 2006: Liftgate, Tire Pressure Monitoring System |
| TBC 2C | Truck Body Controller |
| FLASH (HAZRD) | Flasher Module |
| CB LT DOORS | 2003-2005: Left Power Window Circuit Breaker 2006: Left Rear Power Window Circuit Breaker and Driver Door Module |
| TBC 2B | Truck Body Controller |
| TBC 2A | Truck Body Controller |
Center Instrument Panel Fuse Block
This unit is located underneath the instrument panel, to the left of the steering column
2001-2002
Center Instrument Panel Block (2001-2002)
| Relay Name | Description |
|---|---|
| SEO | Special Equipment Option |
| HTD ST | Heated Seats |
| SPARE 4 | Not Used |
| VANITY | Headliner Wiring |
| TRAILER | Trailer Brake Wiring |
| PWR ST | Power Seats |
| YE9 | Not Used |
| UPF | Upfitter |
| PARK LAMP | Parking Lamps |
| * (FRT PRK EXPT) | Not Used |
| SPARE 2 | Not Used |
| PUDDLE LP | Puddle Lamps |
| SL RIDE | Not Used |
| SPARE 3 | Not Used |
| INADV PWR | Interior Lamps Feed |
| CTSY LP | Courtesy Lamps |
| CEL PHONE | Cellular Telephone Wiring |
2003-2006
Center Instrument Panel Block (2003-2006)
| Name | Description |
|---|---|
| SEO | 2003-2005: Special Equipment Option 2006: Special Equipment Option/Off-road Lamps Harness Connector |
| TRAILER | Trailer Brake Wiring |
| UPFIT | Upfitter (Not Used) |
| SL RIDE | Ride Control Harness Connection |
| HDLR 2 | Headliner Wiring Connector 2 |
| BODY | Body Wiring Connector |
| DEFOG | Rear Defogger Relay |
| HDLNR 1 | Headliner Wiring Connector 1 |
| SPARE RELAY | Not Used |
| CB SEAT | Driver and Passenger Seat Module Circuit Breaker |
| CB RT DOOR | 2003-2005: Right Power Window Circuit Breaker 2006: Rear Right Power Window, Passenger Door Module |
| SPARE | Not Used |
| INFO | 2003-2005: Infotainment Harness Connection 2006: Not Used |
Fuse Box in the engine compartment
Fuse Box Location
Fuse box diagram (2001-2002)
Assignment of the fuses and relays in the Engine compartment (2001-2002)
| Name | Description |
|---|---|
| STUD #1 | Accessory Power/Trailer Wiring Feed/Load Leveling |
| ABS | Anti-Lock Brakes |
| IGN A | Ignition Switch |
| AIR | A.I.R. System |
| RAP #1 | Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seats |
| IGN B | Ignition Switch |
| RAP #2 | Retained Accessory Power/Rear Power Windows, Sunroof, Radio |
| STUD #2 | Accessory Power/Trailer Wiring Brake Feed |
| TRL R TRN | Right Turn Signal Trailer Wiring |
| TRL L TRN | Left Turn Signal Trailer Wiring |
| IGN 1 | Ignition, Fuel Controls |
| INJ-B | Ignition, Fuel Controls (Relay) |
| STARTER | Starter (Relay) |
| PARK LP | Parking Lamp |
| FRT HVAC | Climate Control System |
| STOP LP | Exterior Lamps, Stoplamps |
| ECM 1 | VCM/PCM |
| CHMSL | Center High Mounted Stoplamp |
| VEH STOP | Stoplamps, Cruise Control |
| TRL B/U | Backup Lamps Trailer Wiring |
| INJ-A | Fuel Controls, Ignition |
| RR HVAC | Rear HVAC |
| VEH B/U | Vehicle Backup Lamps |
| ENG 1 | Engine Controls, Canister Purge, Fuel System |
| ETC | Electronic Throttle Control |
| IGN E | A/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. System |
| B/U LP | Backup Lamps, Automatic Transmission Shift Lock Control System |
| ATC | Automatic Transfer Case |
| RR DEFOG | Rear Window Defogger, Heated Mirrors (Relay) |
| RTD | Autoride (Real Time Damping) |
| RR PRK | Right Rear Parking Lamps |
| ECM B | VCM/PCM |
| F/PMP | Fuel Pump (Relay) |
| O2 A | Oxygen Sensors |
| O2 B | Oxygen Sensors |
| LR PRK | Left Rear Parking Lamps |
| RR DEFOG | Rear Window Defogger, Heated Mirrors |
| HDLP | Headlamps (Relay) |
| TRL PRK | Parking Lamps Trailer Wiring |
| PRIME | Not Used |
| RT HDLP | Right Headlamps |
| DRL | Daytime Running Lamps (Relay) |
| HTD MIR | Heated Mirrors |
| LT HDLP | Left Headlamps |
| A/C | Air Conditioning |
| AUX PWR | Cigarette Lighter, Auxiliary Power Outlets |
| SEO 2 | Special Equipment Option Power, Power Seats |
| SEO 1 | Special Equipment Option Power |
| DRL | Daytime Running Lamps |
| A/C | A/C (Relay) |
| FOG LP | Fog Lamps |
| FOG LP | Fog Lamps (Relay) |
| RADIO | Audio System, Instrument Cluster, Climate Control System |
| CIGAR | Cigarette Lighter, Auxiliary Power Outlets |
| RT TURN | Right Turn Signals |
| BTSI | Automatic Transmission Shift Lock Control System |
| LT TURN | Left Turn Signals |
| FR PRK | Front Parking Lamps, Sidemarker Lamps |
| W/W PMP | Windshield Washer Pump |
| HORN | Horn (Relay) |
| IGN C | Ignition Switch, Fuel Pump, PRND321 Display, Crank |
| RDO AMP | Radio Amplifier |
| HAZ LP | Exterior Lamps, Hazard Lamps |
| EXP LPS | Not Used |
| HORN | Horn |
| CTSY LP | Interior Lamps |
| RR WPR | Rear Wipers |
| TBC | Body Control Module, Remote Keyless Entry, Headlamps |
Fuse box diagram (2003-2006)
2003-2004
2005
2006
Assignment of the fuses and relays in the Engine compartment (2003-2006)
| Name | Description |
|---|---|
| GLOW PLUG | Not Used |
| CUST FEED | Accessory Power |
| HYBRID | 2005: Hybrid 2006: Not Used |
| STUD #1 | 2003-2005: Auxiliary Power 2006: Accessory Power/Trailer Wiring |
| MBEC (MBEC 1) | Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors |
| BLOWER | Front Climate Control Fan |
| LBEC (LBEC 2) | Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet—Rear Cargo Area and Instrument Panel |
| STUD 2 | Accessory Power/Trailer Wiring Brake Feed |
| ABS | Anti-Lock Brakes |
| VSES/ECAS | 2003-2005: Vehicle Stability 2006: Automatic Level Control (ALC) Compressor |
| IGN A | Ignition Power |
| IGN B | Ignition Power |
| LBEC 1 | Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module |
| TRL PARK | Parking Lamps Trailer Wiring |
| RR PARK | Right Rear Parking and Sidemarker Lamps |
| LR PARK | Left Rear Parking and Sidemarker Lamps |
| PARK LP | Parking Lamps Relay |
| STARTER (STRTR) | Starter Relay |
| INTPARK | 2003-2005: Interior Lamps 2006: Roof Marker Lamps |
| STOP LP | Stoplamps |
| TBC BATT | Truck Body Controller Battery Feed |
| SUNROOF (S/ROOF) | Sunroof |
| SEO B2 | Off-Road Lamps |
| 4WS | 2003-2005: Vent Solenoid Canister/Quadrasteer Module Power 2006: Not used |
| RR HVAC | Rear Climate Control |
| AUX PWR | Auxiliary Power Outlet — Console |
| IGN 1 | Ignition Relay |
| IGN 1 | PCM Ignition |
| PCM 1 | Powertrain Control Module |
| ETC/ECM | Electronic Throttle Control, Electronic Brake Controller |
| INJ 1 | Ignition Coil, Fuel Injectors – Bank 1 |
| INJ 2 | Ignition Coil, Fuel Injectors – Bank 2 |
| IGN E | 2003-2004: Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay 2005-2006: Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay, Electronic Brake Controller TC2 Mode Switch |
| RTD | 2003-2004: Ride Control 2005: Electronic Brake Controller Battery Feed 2006: Electronic Suspension Control, Automatic Level Control (ALC) Exhaust |
| TRL B/U | Backup Lamps Trailer Wiring |
| PCM B | Powertrain Control Module, Fuel Pump |
| F/PMP | Fuel Pump (Relay) |
| O2A O2B | Oxygen Sensors |
| B/U LP | Back-up Lamps, Automatic Transmission Shift Lock Control System |
| RR DEFOG | Rear Window Defogger |
| HDLP-HI | Headlamp High Beam Relay |
| PRIME | Not Used |
| SIR (AIRBAG) | Supplemental Inflatable Restraint System |
| FRT PARK | Front Parking Lamps, Sidemarker Lamps |
| DRL | Daytime Running Lamps (Relay) |
| SEO IGN | Rear Defog Relay |
| TBC IGN1 | Truck Body Controller Ignition |
| HI HDLP-LT | High Beam Headlamp-Left |
| LH HID | 2003-2004: Left Hand High Intensity Discharge Lamps 2005-2006: Not Used |
| DRL | Daytime Running Lamps |
| RVC | Regulated Voltage Control |
| IPC/DIC | Instrument Panel Cluster/Driver Information Center |
| HVAC/ECAS | Climate Control Controller/Electronically Controlled Air Suspension |
| CIG LTR | Cigarette Lighter |
| HI HDLP-RT | High Beam Headlamp-Right |
| HDLP-LOW | Headlamp Low Beam Relay |
| A/C COMP | Air Conditioning Compressor |
| A/C COMP | Air Conditioning Compressor Relay |
| RR WPR | Rear Wiper/Washer |
| RADIO | Audio System |
| SEO B1 | Mid Bussed Electrical Center, HomeLink, Rear Heated Seats |
| LO HDLP-LT | Headlamp Low Beam-Left |
| BTSI | Brake Transmission Shift Interlock System |
| CRANK | Starting System |
| LO HDLP-RT | Headlamp Low Beam-Right |
| FOG LP | 2003-2004: Fog Lamp Relay 2005-2006: Not Used |
| FOG LP | 2003-2004: Fog Lamps 2005-2006: Not Used |
| HORN | Horn Relay |
| W/S WASH | Windshield and Rear Window Washer Pump Relay |
| W/S WASH | Windshield and Rear Window Washer Pump |
| INFO | 2003-2004: OnStar/Rear Seat Entertainment 2005-2006: OnStar |
| RADIO AMP | Radio Amplifier |
| RH HID | 2003-2004: Right Hand High Intensity Discharge Lamp 2005-2006: Not used |
| HORN | Horn Fuse |
| EAP | 2003-2004: Electric Adjustable Pedals 2005-2006: Not Used |
| TREC | All-Wheel Drive Module |
| SBA | 2003-2004: Supplemental Brake Assist 2005-2006: Not Used |
Auxiliary Fuse Block (Electric Cooling Fan)
(if equipped)
It is located in the engine compartment near the fusebox.
Auxiliary Block
| Fuses | Description |
|---|---|
| COOL/FAN | Cooling Fan |
| COOL/FAN | Cooling Fan Relay Fuse |
| COOL/FAN | Cooling Fan Fuse |
| Relays | |
| COOL/FAN 1 | Cooling Fan Relay 1 |
| COOL/FAN 3 | Cooling Fan Relay 3 |
| COOL/FAN 2 | Cooling Fan Relay 2 |
Conclusion
For owners and enthusiasts of classic Cadillac Escalade GMT 800 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 Cadillac’s craftsmanship and innovation in the automotive industry during that era.
