Buick Roadmaster (4B; 1994-1996) fuses and relays

This material discusses in detail the fuse diagrams of the Buick Roadmaster (Series 4B; 9 generation): 1994, 1995, 1996 release.

Fuse #28 in the interior fuse box is responsible for the cigarette lighter.

In the passenger compartment


Located on the driver's side of the instrument panel.


For access, open the plastic cover.

Diagram
No. Description
Circuit Breakers
CB1 Empty (1994)
Power Antenna Relay, Power Seats (1995-1996)
CB2
  • Master Power Window Switch
  • Power Window Lockout Switch and Control Module
CB3
  • Door Lock Relay (1994),
  • Left and Right Recline Switches and Lumbar Switches
  • Driver's and Passenger's Power Seat Switches
CB4 Rear Window Defog Switch and Relay
CB5 Empty
Fuses
1-5 Empty
6 Turn Signal Lamp Flasher, Park Neutral position Switch (1994)
Empty (1995-1996)
7 Electronic Brake Control Module (1994)
Empty (1995-1996)
8 Rear Window Wiper
9 Radio
10 Windshield Wiper/Washer Switch
11
  • Rear Defog Relay, Air Bag System (1995-1996)
  • Rear Compartment Lid Release Switch (1994)
  • SDM (1994)
  • Headlamp Switch, I/P Cluster, Rear Defog Switch
12 Auto Lever Control Sensor, Ignition Switch (1994)
Turn Signal Lamp Flasher, Back-up Lamp/Transmission Position Sensor (PNP) Switch, Shift Interlock (BTSI) (1995-1996)
13 Inside Rearview Mirror, Warning Alarm, Cruise Control Release Switch (1994-1995), Stoplamp Switch (1996), Headlamp Auto Control Module, Daytime Running Lamp Control Module, Remote Control Door Lock Receiver, Automatic Level Control Sensor
14 Theft-Deterrent Module
15 Air Bag Module
16 Cruise Control System, Cruise Control Switch/Release Switch
17 Low Blower Module Relay and Heater and A/C Control Unit
18 Power Steering Control Module, Heated Seats Control (1995-1996)
19 Empty
20 Electric Actuator, Vacuum Electric Solenoid, Heater and A/C Control, Instrument Cluster, Daytime Running Lamps (1995-1996)
21-23 Empty
24 Air Bag Module / SDM, Theft-Deterrent Relay
25 Empty
26 Radio Power Antenna Relay (1994)
Empty (1995-1996)
27 Auto Level Control Sensor, Rear Compartment Courtesy Lamp, Mercury Switch
28
  • Buick Roadmaster Cigarette Lighter Fuse
  • Diagnostic Link Connector (1996)
29 Remote Control Door Lock Receiver, Rear Compartment Lid Release Switch, Liftgate Wiper Latch Switch, Rear Glass Release Switch, Rear Glass Release Relay, Rear Compartment Release Relay
30 Radio
31 Headlamp Switch and Auto Control Unit, Daytime Running Lamps (DRL) Control Unit
32 Horn Relay
33 Warning Alarm, I/P Compartment Lamp, I/P Cluster, Heater and A/C Control Unit
34 Theft-Deterrent Module
35 Courtesy Lamp Relay, Front Door Lock Switches and Courtesy Lamps, Rear Door Courtesy Lamps, Outside Remote Control Rearview Mirror Switch, Inside Rearview Mirror, Sunshade, Illuminated Mirrors, I/P Door Lamps, Roof Rail Courtesy Lamps
36 Rear Window Wiper Motor, Rear Compartment Lid Pull-Down Actuator
37 Stoplamp Switch, Hazard Lamp Rasher
38 Empty (1994)
Blower Motor Control Unit (1995-1996)
39 Empty (1994)
Power Door Lock Relay (1995-1996)
40 Blower Motor Control Module (1994)
Heated Seat Controls (1995-1996)
41 Turn Signal Switch, Sidemarker Lamps, Turn/Parking Lamps
42 Radio, Heater and A/C Control, Headlamp Switch, Instrument Cluster, Headlamp and Instrument Panel Lamp Dimmer Switch. Panel Lamps Dimming Module, Interior Lights (1994)
Radio, Heater and A/C Control Unit, Headlamp Switch, Instrument Cluster (1995-1996)
43 Opera and License Plate Lamps, Marker Lamps, Inboard Tail lamps, Outboard Tail/Tum Stop lamps, Inboard Tail/Turn Stop lamps
44 Power Mirrors Heater
45 Empty

In the engine compartment


Fuse box located on the right side, behind the plasctic cover.


Access example.

Diagram
No. Description
Relays
R1 Buick Roadmaster fuel pump relay
R2 Air Conditioning Compressor
R3 Air Pump
R4 Primary Cooling Fan
R5 Secondary Cooling Fan
Fuses
1 Auto Level Control Air Compressor
2
  • Fuel Pump Switch/Relay
  • Engine Oil Pressure Sensor (1994-1995)
  • PCM
3 Underhood Lamp and Secondary Air Pump Relay
4
  • Mass Air Flow Sensor
  • Evaporative Emission Solenoid
  • Secondary Air Pump Relay
  • EGR Solenoid
  • ​Automatic Transmission
  • Oxygen Sensors
5 PCM, Electronic Brake Control Module, Ignition Coil
6 Fuel Injector Cylinders - 1, 4, 6, 7
7 Cooling Fan #1, A/C Compressor Relay
8 Generator, Cooling Fan #2
9 Fuel Injector Cylinders - 2, 3, 5, 8
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