In this article you will find a description of fuses and relays Buick,
with photos of block diagrams and their locations.
Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.
Instrument Panel Fuse Block
The instrument panel fuse block is located to the far right side under the instrument panel.
Fuses | Usage |
SBM | Interior Lamps |
PDM | PDM Module |
A/C | HVAC Motor, HVAC Mix Motors |
IGN SEN | EC Mirror, Driver HTS Seat, Rear Defog Relay, MEM Module, Cool LVL Sensor, Pass Heated Seat |
ELC | HVAC Flat Pk Mtrs, Electronic Level Control Sensor, Electronic Level Control Sensor (R Bec) |
ABS | Anti-Lock Brake System Module |
HVAC | HVAC Main Con Head, HVAC Programmer, IPC |
CR CONT | Stepper Motor Cruise, Cruise Switch |
HUD | HUD Switch, HUD Display |
CSTR/SBM | HVAC Programmer, Instrument Panel Cluster, SBM (275 to LCM) (1135 to BTSI SL) |
LP PK L | Underhood Lamp, L PK/ Sidemarker, L Park/Turn Lamp, SBM, L Tail Signal Lamp, L Tail/Stoplamp, L Rear Sidemarker |
LP PK R | Rt Pk/Sidemarker Lamp, Rt PK/Turn Lamp, Rt Tail/Sign Lamp, Rt Tail/Stoplamp, Rt Rear Sidemarker, Stop/Taillamp, Tail/Signal Lamp, License Lamp, RFA |
RUN | Run/Accessory |
WSW | Wiper Motor |
Blank | Not Used |
WSW/RFA | Wiper Switch, RFA, Rain Sense |
B/U LP | EC Mirror, Back-Up Lamps |
Underhood Fuse Block
There are additional fuses located in the engine compartment on the passenger’s side of the vehicle.
Position | Usage |
1 | Not Used |
2 | SBM, LCM |
3 | Turn Signal |
4 | Pre-Oxygen Sensor, Post-Oxygen Sensor |
5 | SDM-R Module |
6 | PCM, MAF Sensor |
7 | AC Clutch |
8 | Brake Switch, Trans Shift, PCM/ EGR Ref, Lin EGR, Cnstr Purge Sol, Cnstr Purge SW |
9 | Horn Relay |
10 | Not Used |
11 | Not Used |
12 | Injectors #1-6 |
13 | Ignition Module |
14 | Rt High Beam |
15 | Not Used |
16 | Lt High Beam |
17 | Not Used |
18 | Rt Low Beam |
19 | Lt Low Beam |
20 | Turn Signal, Stepper Mtr, Brake Lamp, CHMSL |
21 | Fuel Pump Relay (Wire in BEC) |
22 | Ignition Switch |
23 | In Key Module, PCM |
24 | To IP BEC-B/U Lamp |
25 | Flasher Module |
26 | Not Used |
27 | Not Used |
28 | Relay–Ignition |
29 | Relay–Horn |
30 | Relay–Cooling Fan #2 |
31 | Relay–Starter |
32 | Not Used |
33 | Relay–Cooling Fan S/P |
34 | Relay–Cooling Fan #1 |
35 | Relay–A/C CLU micro |
36 | Relay–Fuel Pump micro |
37 | BAT #1 |
38 | HVAC Blower Motor |
39 | Low Speed Fan Relay |
40 | LCM Module |
41 | BAT #2 |
42 | IGN |
43 | Starter |
44 | High Speed Fan Relay |
Rear Compartment Fuse Block
Additional fuses are located in the fuse center under the rear seat. The rear seat cushion must be removed to access the fuses.
Position | Usage |
1 | Relay–Heated Backlite to Rear Grid |
2 | Relay–Rap |
3 | Relay–Trunk Release to Solenoid |
4 | Relay–ELC to Compressor |
5 | Memory Seat Module, Driver Seat Switch, Driver Lumbar SW |
6 | ELC Sensor, ELC Compressor Solenoid |
7 | Crank |
8 | Auxiliary Outlet (2 in Cn), Auxiliary Outlet (1 in St) |
9 | PCM/CRU |
10 | SBM Module |
11 | Radio/Phone |
12 | Sunroof |
13 | Not Used |
14 | Cell Phone Handset, Cell Phone Booster, CD Changer |
15 | Driver Door Module |
16 | Not Used |
17 | Amp, Radio Head |
18 | Driver Heated Seat Module |
19 | Rear Door Mod (2 LD) |
20 | Fuel Door Rel Solenoid, Trunk Release Relay, DLC |
21 | Not Used |
22 | IP Ashtray Cigarette Lighter |
23 | Not Used |
24 | Not Used |
25 | Passenger Heated Seat Module |
26 | Rt Rear Cig Lighter |
27 | Lt Rear Cig Lighte |
28 | RFA, Memory Seat Module, Driver Seat Switch |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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