GM Service Manual Online
For 1990-2009 cars only
Table 1: Maxifuse/Minifuse Feeds
Table 2: Maxifuse To System Feeds
Table 3: Minifuses Circuit Feeds
Table 4: Relay Circuit Feeds
Table 5: Miscellaneous Devices
Table 6: Minifuses Circuit Feeds
Table 7: Relay/Module Circuit Feeds

Underhood Fuse Block (UHFB) Diagram


Object Number: 874358  Size: FP

Underhood Fuse Block (UHFB) Chart

This chart lists the maxifuses located in the underhood fuse block and the minifuses or relays they control.

Important: A label is provided on the fuse block cover for the fuse layout.

Maxifuse/Minifuse Feeds

Fuse (CB)

Color (AMP)

Mini Fuse (AMP)

ABS

Red (50)

Feeds directly to Antilock Brake System

AIR PUMP

Green (30)

Air Pump Feeds directly to AIR PUMP Relay

COOL FAN

Green (30)

Cooling Fan Feeds directly to COOL FAN Relay

IGN 3

Green (30)

IGN 3 (10), HVAC (15)

IGN 1/4

Green (30)

Feeds directly to A/C Relay, AIR PUMP Relay, WINDOW Relay. IGN 1 (10), TURN (10), B/U LP (10), EMISS (10), EIS (10), PCM I (10), INJ (10), WIPER (25), AIR BAG (10), RADIO (IGN) (10), CRUISE 1 (10)

IP BATT

Green (30)

Feeds directly to FUEL PUMP Relay. After relay, FUEL PUMP (10),

TRS 3/4 (10), TRS 2/TCC (10), TRS LP (10)

WINDOW

Green (30)

Feeds directly to WINDOW Relay, Sun (15) (after WINDOW Relay)

The following chart lists the maxifuses located in the underhood fuse block and the systems they control.

Important: A label is provided on the fuse block cover for the fuse layout.

Maxifuse To System Feeds

Fuse (CB)

Color (AMP)

System

ABS

Red (50)

Antilock Brake System

AIR PUMP

Green (30)

Air Pump

COOL FAN

Green (30)

Engine Cooling Fan

IGN 3

Green (30)

HVAC Control Head, Rear Defogger, Antilock Brakes, Dimmer/Traction/Fog Switch

IGN 1/4

Green (30)

Transaxle Shift Program Switch, Turn Signals, Brake Transaxle Shift Interlock, Backup Lamps, Exhaust Air Valve Solenoid, Canister Purge Solenoid, Electronic Ignition System, I/P Cluster Telltales and Gauges, Powertrain Control Module, Fuel Injectors, Radio, Windshield Wipers/Washer (Front), Rear Heated Oxygen Sensor, Coolant Level Switch, Body Control Module, Sensing and Diagnostic Module, Cruise Control Module, Stop lamps (Brakes), Fresh Air Solenoid, Cruise Control Switches

IP BATT

Green (30)

Cigar Lighter, Automatic Transaxle Actuators

WINDOW

Green (30)

Power Windows, Power Sunroof, Rear Wiper/Washer (Wagon)

The following chart lists the minifuses, located in the underhood fuse block, and the circuits they control.

Important: A label is provided on the fuse block cover for the fuse layout.

Minifuses Circuit Feeds

Fuse

Color (AMP)

System

A/C

Red (10)

Air Conditioning (Feeds directly to A/C Relay)

BRAKE

Blue (15)

Stop Lamps (Brakes)

B/U LP

Red (10)

Backup Lamps, Coolant Level Switch

EIS

Red (10)

Electronic Ignition System

EMISS

Red (10)

Exhaust Air Valve Solenoid, Canister Purge Solenoid, Rear Heated Oxygen Sensor

FOG LP

Red (10)

Fog Lamps (Feeds directly to the FOG LAMP Relay)

HAZARD

Red (10)

Hazard Flasher, Instrument Panel Turn Signal/Lane Change Telltales, Front Park/Turn Lamps, Rear Tail Lamps

HORN

Red (10)

Horn (Feeds directly to HORN Relay)

INJ

Red (10)

Fuel Injectors

L HDLP

Red (10)

Left Headlamp Lights

PARK LP

Red (10)

Front Park Lamps, Rear Tail Lamps, Front Marker Lamps, Fog Lamps, License Plate Lamps, Backlight Dimming for: Instrument Panel, Radio Display, Climate Control Module, PRNDL Shift Indicator

PCM B

Red (10)

Powertrain Control Module Memory

PCM I

Red (10)

Powertrain Control Module

R HDLP

Red (10)

Right Headlamp Lights, Daytime Running Lights

RR DFG

Green (30)

Rear Window Defogger

TRS LP

Red (10)

Automatic Transaxle Line Pressure Actuator

TRS 2/TCC

Red (10)

Automatic Transaxle 2nd Gear and Torque Converter Clutch Actuators

TRS 3/4

Red (10)

Automatic Transaxle 3rd and 4th Gear Actuators

The following chart lists the relays, located in the underhood fuse block, and the systems they control.

Important: A label is provided on the fuse block cover for the fuse layout.

Relay Circuit Feeds

Relay

System

A/C

Air Conditioning System

AIR PUMP

Air Pump System

COOL FAN

Engine Cooling

DRL

Daytime Running Lamps

FOG LAMP

Fog Lamps

HORN

Horn

The following chart lists the miscellaneous devices, located in the underhood fuse block, and the systems they are controlled by.

Important: A label is provided on the fuse block cover for the device layout.

Miscellaneous Devices

Relay

System

A/C DIODE

A/C Compressor (For electrical system protection)

OIL-R

Powertrain Control Module

FUSE PULLER

None

Instrument Panel Fuse Block (IPFB) Diagram


Object Number: 874363  Size: FP

Instrument Panel Fuse Block Charts

The following chart lists the minifuses, located in the instrument panel fuse block, and the systems they control.

Important: A label is provided on the fuse block access panel for fuse layout.

Minifuses Circuit Feeds

Fuse

Color (AMP)

System

AIR BAG

Red (10)

Sensing and Diagnostic Module (SDM)

BODY

Red (10)

Dome Lamp, Luggage Compartment Lamp (Sedan/Coupe), Power Mirrors, Map Lamps, Liftgate/Decklid Release Switch, Power Door Locks, Body Control Module, Datalink Connector

BODY COMP

Red (10)

Body Control Module, I/P Cluster

CD (RIA)

Tan (5)

CD Changer/Player (Retailer installed accessory)

CRUISE1

Red (10)

Cruise Control Module, Stop Lamp (Brake) Switch, Fresh Air Solenoid, Brake Transaxle Shift Interlock, Cruise 2 Fuse

CRUISE2

Gray (2)

Cruise Control Switches

FUEL PUMP

Red (10)

Fuel Pump

HVAC

Blue (15)

HVAC Control Head, Rear Defogger

IGN 1

Red (10)

Transaxle Shift Program Switch, I/P Cluster Telltales and Gauges, Body Control Module

IGN 3

Red (10)

Antilock Brakes, Dimmer/Traction/Fog Switch, Rear Defogger

LIGHTER

Yellow (20)

Cigar Lighter

LOCKS

Yellow (20)

Power Door Locks

RADIO (BATT)

Red (10)

Radio/Clock Memory

RADIO (IGN)

Red (10)

Radio, Body Control Module

SUN

Blue (15)

Power Sunroof, Rear Wiper/Washer (Wagon)

TURN

Red (10)

Turn Signals

WIPER

Natural (25)

Windshield Wipers and Washers (Front)

The following chart lists the relays, located in the instrument panel fuse block, and the systems they control.

Important: A label is provided on the fuse block access panel for relay layout.

Relay/Module Circuit Feeds

Relay/Module

System

FLASHER MODULE

Turn Signal/Hazard Flashers, (Back side of IPFB)

FUEL PUMP

Fuel Pump, Transaxle Actuators

HVAC BLOWER

HVAC Blower Motor

LOCK

Door Locks (Lock)

REAR DEFOG

Rear Defogger

UNLOCK

Door Locks (Unlock)

WINDOW

Power Windows, Power Sunroof, Rear Wiper/Washer (Wagon)