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

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