Buick Rainier (2003–2006) fuse box and relay Diagrams
The Buick Rainier, produced between 2003 and 2006, epitomizes Buick’s dedication to blending luxury with robust performance in the mid-size SUV segment. The vehicle’s sophisticated electrical system includes essential components such as the fuse box and relays.
The fuse box in the Buick Rainier 2003–2006 houses fuses designed to protect electrical circuits from overloads and short circuits, safeguarding critical components like headlights, taillights, and power windows. Relays, operating as electrically controlled switches, manage the flow of electricity to systems such as the starter motor, fuel pump, and cooling fans, ensuring efficient and reliable operation.
Additional advanced electrical components in the Buick Rainier of this era include climate control systems, power-adjustable seats, and premium audio systems. These features rely on a robust electrical infrastructure to enhance comfort, convenience, and entertainment for occupants.
Understanding the layout and function of the fuse box and relays is crucial for maintaining and troubleshooting the Buick Rainier 2003–2006’s electrical systems. Regular inspection and maintenance of these components help ensure the vehicle’s reliability and performance, continuing its legacy as a refined and dependable SUV in Buick’s lineup.
(2003–2006) Buick Rainier 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.
Buick Rainier 2003–2006 fuse assignment
Year of production: 2003, 2004, 2005, 2006
Engine Compartment Fuse Block
The fuse block is located under the hood in the engine compartment on the driver’s side of the vehicle.
Engine L6
| Fuses | Usage |
| 1 | Electrically-Controlled Air Suspension |
| 2 | Passenger’s Side High-Beam Headlamp |
| 3 | Passenger’s Side Low-Beam Headlamp |
| 4 | Back-Up Trailer Lamps |
| 5 | Driver’s Side High-Beam Headlamp |
| 6 | Driver’s Side Low-Beam Headlamp |
| 7 | Windshield Wiper |
| 8 | Automatic Transfer Case |
| 9 | Windshield Washer |
| 10 | Powertrain Control Module B |
| 11 | Fog Lamps |
| 12 | Stoplamp |
| 13 | Cigarette Lighter |
| 14 | Not Used |
| 15 | Electric Adjustable Pedal |
| 16 | Truck Body Controller, Ignition 1 |
| 17 | Crank |
| 18 | Airbag |
| 19 | Trailer Electric Brake |
| 20 | Cooling Fan |
| 21 | Horn |
| 22 | Ignition E |
| 23 | Electronic Throttle Control |
| 24 | Instrument Panel Cluster, Driver Information Center |
| 25 | Automatic Shift Lock Control System |
| 26 | Engine 1 |
| 27 | Back-up |
| 28 | Powertrain Control Module 1 |
| 29 | Oxygen Sensor |
| 30 | Air Conditioning |
| 31 | Truck Body Controller 1 |
| 32 | Trailer |
| 33 | Anti-lock Brakes (ABS) |
| 34 | Ignition A |
| 35 | Blower Motor |
| 36 | Ignition B |
| 50 | Passenger’s Side Trailer Turn |
| 51 | Driver’s Side Trailer Turn |
| 52 | Hazard Flashers |
| 53 | Headlamp Driver Module |
| 54 | Air Injection Reactor (AIR) Solenoid |
| 56 | Air Injection Reactor (AIR) Pump |
| Relays | Usage |
| 37 | Blank or Headlamp Washer |
| 38 | Rear Window Wiper/Washer |
| 39 | Fog Lamps |
| 40 | Horn |
| 41 | Fuel Pump |
| 42 | Windshield Washer |
| 43 | High-Beam Headlamp |
| 44 | Air Conditioning |
| 45 | Cooling Fan |
| 46 | Headlamp Driver Module |
| 47 | Starter |
| 49 | Electric Adjustable Pedal |
| 55 | Air Injection Reactor (AIR) Solenoid |
| 57 | Powertrain |
| 58 | Vehicle Stability Enhancement System (StabiliTrak®) |
| Miscellaneous | Usage |
| 48 | Instrument Panel Battery |
Engine V8
| Fuses | Usage |
| 1 | Electrically-Controlled Air Suspension |
| 2 | Passenger’s Side High-Beam Headlamp |
| 3 | Passenger’s Side Low-Beam Headlamp |
| 4 | Back-Up Trailer Lamps |
| 5 | Driver’s Side High-Beam Headlamp |
| 6 | Driver’s Side Low-Beam Headlamp |
| 7 | Rear Window Washer |
| 8 | Automatic Transfer Case |
| 9 | Windshield Washer |
| 10 | Powertrain Control Module B |
| 11 | Fog Lamps |
| 12 | Stoplamp |
| 13 | Cigarette Lighter |
| 14 | Ignition Coils |
| 15 | Canister Vent |
| 16 | Truck Body Controller, Ignition 1 |
| 17 | Crank |
| 18 | Airbag |
| 19 | Trailer Electric Brake |
| 20 | Cooling Fan |
| 21 | Horn |
| 22 | Ignition E |
| 23 | Electronic Throttle Control |
| 24 | Instrument Panel Cluster, Driver Information Center |
| 25 | Automatic Shift Lock Control System |
| 26 | Engine 1 |
| 27 | Backup |
| 28 | Powertrain Control Module 1 |
| 29 | Powertrain |
| 30 | Air Conditioning |
| 31 | Injector Bank A |
| 32 | Trailer |
| 33 | Anti-lock Brakes (ABS) |
| 34 | Ignition A |
| 35 | Blower Motor |
| 36 | Ignition B |
| 50 | Passenger’s Side Trailer Turn |
| 51 | Driver’s Side Trailer Turn |
| 52 | Hazard Flashers |
| 53 | Transmission |
| 54 | Oxygen Sensor Bank B |
| 55 | Oxygen Sensor Bank A |
| 56 | Injector Bank B |
| 57 | Headlamp Driver Module |
| 58 | Body Controller 1 |
| 59 | Electric Adjustable Pedal |
| 61 | Vehicle Stability Enhancement System (StabiliTrak®) |
| Relays | Usage |
| 37 | Headlamp Washer |
| 38 | Rear Window Wiper/Washer |
| 39 | Fog Lamps |
| 40 | Horn |
| 41 | Fuel Pump |
| 42 | Windshield Wipers/Washer |
| 43 | High-Beam Headlamp |
| 44 | Air Conditioning |
| 45 | Cooling Fan |
| 46 | Headlamp Driver Module |
| 47 | Starter |
| 49 | Electric Adjustable Pedal |
| 60 | Powertrain |
| Miscellaneous | Usage |
| 48 | Instrument Panel Battery |
Rear Underseat Fuse Block
| Fuses | Usage |
| 01 | Passenger Door Control Module |
| 02 | Driver Door Control Module |
| 03 | Liftgate Module 2 |
| 04 | Truck Body Controller 3 |
| 05 | Rear Fog Lamps |
| 06 | Blank |
| 07 | Truck Body Controller 2 |
| 08 | Power Seats |
| 09 | Rear Wiper |
| 10 | Driver Door Module |
| 11 | Amplifier |
| 12 | Passenger Door Module |
| 13 | Rear Climate Controls |
| 14 | Left Rear Parking Lamps |
| 15 | Blank |
| 16 | Vehicle Center High-Mounted Stoplamp (CHMSL) |
| 17 | Right Rear Parking Lamps |
| 18 | Locks |
| 19 | Liftgate Module/Driver Seat Module |
| 20 | Blank |
| 21 | Lock |
| 23 | Blank |
| 24 | Unlock |
| 25 | Blank |
| 26 | Blank |
| 27 | OnStar® Overhead Battery, OnStar® System |
| 28 | Sunroof |
| 29 | Rainsense™ Wipers |
| 30 | Parking Lamps |
| 31 | Truck Body Controller Accessory |
| 32 | Truck Body Controller 5 |
| 33 | Front Wipers |
| 34 | Vehicle Stop |
| 35 | Transmission Control Module |
| 36 | Heat Ventilation Air Conditioning B |
| 37 | Front Parking Lamps |
| 38 | Left Turn Signal |
| 39 | Heat Ventilation Air Conditioning I |
| 40 | Truck Body Controller 4 |
| 41 | Radio |
| 42 | Trailer Park |
| 43 | Right Turn Signal |
| 44 | Heat Ventilation Air Conditioning |
| 45 | Rear Fog Lamps |
| 46 | Auxiliary Power 1 |
| 47 | Ignition 0 |
| 48 | Four-Wheel Drive |
| 49 | Blank |
| 50 | Truck Body Controller Ignition |
| 51 | Brakes |
| 52 | Truck Body Controller Run |
Conclusion
For owners and enthusiasts of classic Buick Rainier models from 2003–2006, 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 Buick’s craftsmanship and innovation in the automotive industry during that era.