The Chevrolet Suburban, built on the GMT400 platform from 1993 to 1999, is a hallmark of durability and versatility in the full-size SUV market. Known for its ability to handle everything from family road trips to heavy-duty towing, the Suburban during these years also featured a reliable electrical system, which is crucial for the operation of its various functions. The fuse box and relays play a key role in maintaining this system.

The fuse box in the 1993-1999 Chevrolet Suburban is designed to protect the vehicle’s electrical circuits. Typically, these models have two main fuse boxes: one located in the engine compartment and another in the interior, often under the dashboard. The engine compartment fuse box manages circuits related to the engine, transmission, and other high-power components, while the interior fuse box covers systems like lighting, power windows, and climate control. If any electrical component stops working, checking the relevant fuse is the first step, as a blown fuse can indicate an overload or short circuit in that specific circuit.

Relays in the Suburban are electrically controlled switches that manage the flow of power to high-current systems, such as the starter, fuel pump, and cooling fans. Relays allow these systems to be controlled by lower-power circuits, preventing the vehicle’s wiring and switches from being overloaded. A faulty relay can lead to issues like the engine not starting or the cooling system failing, both of which can cause significant operational problems.

Regular maintenance of the fuse box and relays ensures that the Chevrolet Suburban’s electrical systems remain in top condition, contributing to the vehicle’s long-standing reputation for reliability and performance.

MUST READ: DYI – How to Check Car Fuses?

(1993-1999) Chevrolet Suburban (GMT400) 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.

Chevrolet Suburban (GMT400) 1993-1999 fuse assignment

  • Cigar lighter (power outlet) fuses in the Chevrolet Suburban are the fuses №7 “AUX PWR” (Aux Power Outlet) and №. 13 “CIG LTR ” (Cig Lighter) in the Instrument panel fuse box (1995-1999).

Year of production: from 1993, 1994, 1995, 1996, 1997, 1998, 1999

Instrument Panel Fuse Box

1993-1994

Chevrolet Suburban 1993 1999 Instrument Panel Fuse Box

The fuse block is behind an access door at the bottom of the instrument panel, next to the parking brake release lever

Fuse box diagram
Instrument panel fuse box diagram: Chevrolet Suburban (1993, 1994)
Instrument panel fuse box diagram: Chevrolet Suburban (1993, 1994)

Assignment of the fuses in the Instrument Panel (1993, 1994)

NameCircuit protectedAmpere rating [A]
GagesCruise Control, 4 WD Display illum. Rear Window Defogger Timer, Aux. Batt. Relay Feed, Safety Belt Buzzer Timer, Cluster Ign. Feed20
Turn-B/UBack-up Lamps, Turn Signals15
EMC/IgnT.C.C., Air Diverter, E.S.C., E.G.R., E.C.M., Ign., R.W.A.L. Brake Switch10
Inj. AThrottle Body Injectors10
BrakeA.B.S., Cluster-Speed015
AC/HtrH.V.A.C. 4 WD, Aux. Batt. Relay25
CtsyDome Lamp, Ctsy. and Glove Box Lps. (TR-9), Radio (Memory-Clock)20
Park LPHorn Relay, Horn Feed, Park Lamps20
P. LpsC49 SW Illum., Headlamp “On” Warning, Radio Illum., H.V.A.C. Illum.5
Stop/HazHaz. Flasher, Seat Belt Buzzer, Stop Lmps., A.B.S. Memory15
WiperWindshield Wiper, Washer25
RadioRadio Feed10
Acc/IgnPwr. Windows30 (CB)
Acc/BattDoor Locks, Rear Window Defogger30 (CB)
CrankCrank, Discreet5
4WDFour Wheel Drive25
DRLDaytime Running Lights15
RR WprRear Window Wiperwasher25
T/G RelCigar Lighter, Rear Hatch Release25

1995-1999

The location of the fuses in the passenger compartment: Chevrolet Suburban (1995, 1996, 1997, 1998, 1999)
The location of the fuses in the passenger compartment: Chevrolet Suburban (1995, 1996, 1997, 1998, 1999)

The fuse block access door is on the driver’s side edge of the instrument panel.

Fuse box diagram
Instrument panel fuse box diagram: Chevrolet Suburban (1995, 1996, 1997, 1998, 1999)
Instrument panel fuse box diagram: Chevrolet Suburban (1995, 1996, 1997, 1998, 1999)

Assignment of the fuses in the Instrument Panel (1995-1999)

NameCircuit protected
1STOP/HAZStop/TCC Switch, Buzzer, CHMSL, Hazard Lamps, Stop Lamps
2T CASETransfer Case
3CTSYCourtesy Lamps, Cargo Lamp, Glove Box Light, Dome/RDG Lamps, Vanity Mirrors, Pwr Mirrors
4GAGESInstrument Cluster, DRL Relay, Lamp Switch, Keyless Entry, Low Coolant Module, Illuminated Entry Module, DRAC (Diesel Engine)
5RR WACRR HVAC Controls
6CRUISECruise Control
7AUX PWRAux Power Outlet
8CRANK1995-1996: Diesel Fuel Pump, DERM, ECM
1997: Air Bag System
1999: Crank
9PARK LPSLic Lamp, Park Lamp, Tail Lamp, Roof Marker Lamp, Tdi1 Gate Lamps, Front Side Markers, Door Switch Illum, Fender Lamp
10AIR BAGDERM
11WIPERWiper Motor, Washer Pump
12HTR-A/CA/C, A/C Blower, High Blower Relay
13CIG LTRPower Amp, Rear Liftglass, Cig Lighter, Door Lock Relay, Pwr Lumbar Seat
14ILLUM4WD, Indicator, LP Cluster, HVAC Controls, RR HVAC Controls, IP Switches, Radio Illumination, Chime Module
15DRL-FOGDRL Relay, Fog Lamp Relay
16TURN-B/UFront and Rear Turn Signals, Back-up Lamps, BTSI Solenoid
17RADIORadio (Ign)
18BRAKEDRAC (1995-1996), 4WAL PCM, ABS, Cruise
19RADIO BATTRadio (Batt)
20TRANSPRNDL, Auto Transmission, Speedo, Check Gages Tell Tale, Warning Lights
211995-1996: Not Used
1997: Variable Effort Steering
1999: Security/Steering
22Not Used
23RR WiperRear Wiper, Rear Wash Pump
244WDFront Axle, 4WD Indicator Lamp, TP2 Relay (Gasoline Engine)
A (CB)PWR ACCYPwr Door Lock, 6-Way Pwr Seat, Keyless Entry Module
B (CB)PWR WDOSPower Windows

Engine Compartment Fuse Box

Fuse box location

The location of the fuses in the engine compartment: Chevrolet Suburban (1993, 1994, 1995, 1996, 1997, 1998, 1999)
The location of the fuses in the engine compartment: Chevrolet Suburban (1993, 1994, 1995, 1996, 1997, 1998, 1999)

Fuse box diagram

Under-hood fuse box diagram: Chevrolet Suburban (1995, 1996, 1997, 1998, 1999)
Under-hood fuse box diagram: Chevrolet Suburban (1995, 1996, 1997, 1998, 1999)

Assignment of the fuses and relay in the Engine Compartment (1995-1999)

NameCircuit protected
ECM-BFuel Pump, PCM/VCM
RR DEFOGRear Window Defogger (If Equipped)
IGN-EAuxiliary Fan Relay Coil, A/C Compressor Relay, Hot Fuel Module
FUEL SOLFuel Solenoid (Diesel Engine)
GLOW PLUGGlow plugs (Diesel Engine)
HORNHorn, Underhood Lamps
AUX FANAuxiliary Fan
ECM-1Injectors, PCM/VCM
HTD ST-FRHeated Front Seats
A/CAir Conditioning
HTD MIRHeated Outside Mirrors (If Equipped)
ENG-1Ignition Switch, EGR, Canister Purge, EVRV Idle Coast Solenoid, Heated O2, Fuel Heater (Diesel Engine), Water Sensor (Diesel Engine)
HTD ST-RRNot Used
LIGHTINGHeadlamp and Panel Dimmer Switch, Fog and Courtesy Fuses
BATTBattery, Fuse Block Busbar
IGN-AIgnition Switch
IGN-BIgnition Switch
ABSAnti-Lock Brake Module
BLOWERHi Blower and Rear Blower Relays
STOP/HAZStoplamps
HEATED SEATS Heated Seats (If Equipped)

Conclusion

For owners and enthusiasts of classic Chevrolet Suburban (GMT400) 1993-1999, 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 Chevrolet’s craftsmanship and innovation in the automotive industry during that era.

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