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In this article, you will find information about the fuses of the GMC Suburban (GMT400) (1999) , including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.
Checking and Replacing Fuses in GMC Suburban
The wiring circuits in your vehicle are protected from short circuits by a combination of fuses, circuit breakers and fusible thermal links in the wiring itself. This greatly reduces the chance of fires caused by electrical problems. Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse.
Caution!
Be sure you replace a bad fuse with a new one of the identical size and rating.
Location of Fuse Boxes
Instrument Panel Fuse Block:
The fuse block access door is on the driver’s side edge of the instrument panel. Pull off the cover to access the fuse block. You can remove fuses with a fuse extractor. The fuse extractor is mounted to the fuse block access door.
Underhood Fuse/Relay Center:
The underhood fuse/relay center is located in the rear of the engine compartment near the brake fluid reservoir. Move the retainer clips for the cover to access the fuse block.
The headlamp wiring is protected by a circuit breaker in the lamp switch. An electrical overload will cause the lamps to flicker on and off, or in some cases to remain off. If this happens, have your headlamp wiring checked right away.
The windshield wiper motor is protected by a circuit breaker and a fuse. If the motor overheats due to heavy snow, etc., the wiper will stop until the motor cools. Although the circuit is protected from electrical overload, overload due to heavy snow, etc., may cause wiper linkage damage.
Fuse Box Diagrams
1999
Instrument Panel Fuse Block
| № | Usage |
|---|---|
| 1 | Stop / TCC Switch, Buzzer, CHMSL, Hazard Lamps, Stoplamps |
| 2 | Transfer Case |
| 3 | Courtesy Lamps, Cargo Lamp, Glove Box Lamp, Dome / Reading Lamps, Vanity Mirrors, Power Mirrors |
| 4 | Instrument Cluster, DRL Relay, Lamp Switch, Keyless Entry, Low Coolant Module, Illuminated Entry Module, DRAC (Diesel Engine) |
| 5 | Rear Comfort Controls |
| 6 | Cruise Control |
| 7 | Auxiliary Power Outlet |
| 8 | Crank |
| 9 | License Lamp, Parking Lamps, Taillamps, Roof Marker Lamps, Tailgate Lamps, Front Sidemarkers, Fog Lamp Relay, Door Switch Illumination, Fender Lamps, Headlamp Switch Illumination |
| 10 | Air Bag System |
| 11 | Wiper Motor, Washer Pump |
| 12 | A/C, A/C Blower, High Blower Relay |
| 13 | Power Amp, Rear Liftglass, Cigarette Lighter, Door Lock Relay, Power Lumbar Seat |
| 14 | 4WD Indicator, Cluster, Front and Rear Comfort Controls (If Equipped), Instrument Switches, Radio Illumination, Chime Module |
| 15 | DRL Relay, Fog Lamp Relay |
| 16 | Front and Rear Turn Signals, Back-Up Lamps, BTSI Solenoid |
| 17 | Radio (Ignition) |
| 18 | 4WAL / VCM, ABS, Cruise Control |
| 19 | Radio (Battery) |
| 20 | PRNDL, Automatic Transmission, Speedometer, Check Gages, Warning Lights |
| 21 | Security / Steering |
| 22 | Not Used |
| 23 | Rear Wiper, Rear Washer Pump |
| 24 | Front Axle, 4WD Indicator Lamp, TP2 Relay (Gasoline Engine) |
| A | Power Door Lock, Six-Way Power Seat, Keyless Entry Module |
| B | Power Windows |
Underhood Fuse/Relay Center
| Name | Circuits Protected |
|---|---|
| ECM-B | Fuel Pump, PCM / VCM |
| RR DEFOG | Rear Window Defogger (If Equipped) |
| IGN-E | Auxiliary Fan Relay Coil, A/C Compressor Relay, Hot Fuel Module |
| FUEL SOL | Fuel Solenoid (Diesel Engine) |
| GLOW PLUG | Glow plugs (Diesel Engine) |
| HORN | Horn, Underhood Lamps |
| AUX FAN | Auxiliary Fan |
| ECM-1 | Injectors, PCM / VCM |
| HTD ST-FR | Heated Front Seats |
| A/C | Air Conditioning |
| HTD MIR | Heated Outside Mirrors (If Equipped) |
| ENG-1 | Ignition Switch, EGR, Canister Purge, EVRV Idle Coast Solenoid, Heated O2, Fuel Heater (Diesel Engine), Water Sensor (Diesel Engine) |
| HTD ST-RR | Not Used |
| LIGHTING | Headlamp and Panel Dimmer Switch, Fog and Courtesy Fuses |
| BATT | Battery, Fuse Block Busbar |
| IGN-A | Ignition Switch |
| IGN-B | Ignition Switch |
| ABS | Anti-Lock Brake Module |
| BLOWER | Hi Blower and Rear Blower Relays |
| STOP/HAZ | Stoplamps |
| HEATED SEATS | Heated Seats (If Equipped) |