GM Service Manual Online
For 1990-2009 cars only

Underhood Fuse Block


Object Number: 400308  Size: MF

No.

Fuse/Relay

Rating

Description

1

BTSI

10A

TCC/Stop Lamp Switch, Automatic Transmission Controller, and Transfer Case Control Module

2

B/U LP

25A

Backup Lamp Switch and Park/Neutral Position (PNP) Switch

3

Starter

--

Power supply relay to the Starter

4

IGN B

50A

Ignition Switch

5

IGN E

10A

Flash To Pass Switch, Flash To Pass Relay, A/C Compressor Clutch Relay, and Rear Defogger Relay. Headlamp Leveling Switch and Headlamp Leveling Actuators (LH/RH) (UK/S. Africa)

6

RAP

50A

Retained Accessory Power Relay

7

OXYSEN

20A

Oxygen Sensor power feed

8

IGN A

40A

Starter Relay power feed and ignition switch

9

LR PRK

10A

Tail/Stop Lamp, LH

10

PARK LP

20A

Park Lamp Relay, Front Fog Lamp Relay, Park lamp Switch Relay, and Headlamp Switch

11

STUD #2

30A

Trailer Wiring Provisions - Battery power supply

12

ATC

20A

Transfer Case Control Module and Transfer Case Encoder Motor

13

HVAC

30A

Blower Motor

14

TR HMSL

10A

Trailer Wiring Provision - stop signal

15

HAZ LP

20A

Hazard Switch

16

VE HMSL

10A

Tail/Stop Lamp (LH/RH), High Mount Stop Lamp, R100, and Cruise Control Module

17

RR DEFOG

--

Rear Defogger Relay

18

R DEFOG

30A

Rear Window Defogger Grid

19

HTDMIR

10A

Outside Rear View Mirror (LH/RH)

20

HDLP W/W

15A

Headlamp Washer Pump Relay

21

RR W/W

15A

Rear Wiper/Washer Switch and Endgate Window Release Switch

22

CRANK

10A

Park/Neutral Position Switch (Automatic Trans) or Clutch Pedal Position Switch and Transfer Case Control Module (Manual Trans)

23

STOP LP

20A

TCC/Stop Lamp Switch

24

TBC

10A

Power Radio Antenna, Body Control Module, and Remote Control Door Lock Receiver

25

--

--

Not Used

26

RR FOG LP

--

Rear Fog Lamp Relay

27

HTD SEAT

20A

Heated Seat Module (LH/RH)

28

IGN C

20A

Not Used

29

FOG LP

15A

Rear Fog Lamp Relay

30

HORN

--

Horn Relay

31

MIR/LKS

5A

Endgate Liftglass Relay, Body Relay Block, Endgate Lock Cylinder Switch, Door Lock and Side Window Switch (LH), Side Window Regulator Motor (RH), Door Lock and Side Window Switch (RH), and Outside Rear View Mirror Switch

32

A/C

10A

A/C Compressor Clutch Relay

33

A/C

--

A/C Compressor Clutch Relay

34

HORN

15A

Horn (LH/RH)

35

LIFT GLASS

--

Liftglass Relay

36

W/W PMP

10A

Headlamp Washer Pump Relay

37

RT HDLP

15A

Headlamp Switch, Headlamp RH Low Beam, and Headlamp RH High Beam

38

FR PRK

10A

Side Marker Lamp (LH/RH)

39

LT TURN

10A

Side Repeater Lamp (LH) and Turn Signal Lamp (LH)

40

RT TURN

10A

Side Repeater Lamp (RH) and Turn Signal Lamp (RH)

41

HDLP PWR

--

Headlamp Power Relay

42

LT HDLP

15A

Headlamp Washer Pump Relay, Headlamp LH Low Beam, and Headlamp LH High Beam

43

TRL PRK

10A

Rear License Plate Lamp (LH/Center/RH) and Trailer Wiring Provisions - Tail Lamps feed

44

RR PRK

10A

Tail/Stop Lamp, RH

45

VEH B/U

15A

Backup Lamp (LH/RH) and Inside Rear View Mirror (Auto.Day/Night)

46

ECM B

20A

Vehicle Control Module and Fuel Pump Relay

47

TRL B/U

10A

Trailer Wiring Provisions - B/U Lamp feed

48

TR R TRN

10A

Trailer Wiring Provisions - right turn feed

49

TR L TRN

10A

Trailer Wiring Provisions - left turn feed

50

RR TRN

10A

Turn Signal Lamp, RH Rear

51

LR TRN

10A

Turn Signal Lamp, LH Rear

52

ENG 1

10A

Evaporative Emissions Canister Purge Valve, Evaporative Emissions Canister Vent Valve, Mass Air Flow Sensor, and Camshaft Position Sensor

53

ECM 1

15A

Crankshaft Position Sensor, Central Sequential Fuel Injection, Ignition Coil Assembly, and Vehicle Control Module

54

INT BAT

50A

IP Fuse Block

55

ABS

60A

Electronic Brake Control Module

56

F/PUMP

--

Fuel Pump Relay

IP Fuse Block


Object Number: 372101  Size: MF

No.

Fuse Name

Rating

Description

1

--

--

Not Used

2

CIGAR LTR

15A

Cigar Lighter and Data Link Connector

3

CRUISE

10A

Body Control Module, Cruise Control Module, Cruise Control Switch, Lumbar and Heat Switch (LH/RH)

4

GAUGES

10A

Body Control Module and Instrument Cluster

5

--

--

Not Used

6

RDO IGN

10A

Radio, Outside Rear View Folding Mirror Switch, and Driver Information Display Module

7

--

--

Not Used

8

CTSY LP

10A

Courtesy Lamp (LH/RH) Console, Driver Information Display Module, Inadvertant Power Relay, and Cargo Lamp

9

ABS

10A

Electronic Brake Control Module and TCC/Stop Lamp Switch

10

TURN

20A

Hazard Switch

11

RR WPR

15A

Rear Wiper/Washer Switch and Endgate Windor Release Switch

12

ILLUM

10A

Radio, Electronic Climate Control Module, Headlamp Leveling Switch (UK/S. Africa), Hazard Switch, Body Control Module, Transfer Case Select Switch, Instrument Cluster, Driver Information Display Module, Automatic Transmission Controller, and Rear Wiper/Washer Switch and Endgate Window Release Switch

13

AUX PWR

25A

Auxilliary Power Outlet (LH/RH) and Auxiliary Power Outlet, Rear

14

PWR LKS

15A

Door Lock Relay, Door Unlock Relay, and Driver Door Unlock Relay

15

S4WD

10A

Front Axle Switch, Vehicle Control Module, Transfer Case Control Module, Transfer Case Shift Solenoid, and Transfer Case Select Switch

16

SIR

15A

Inflatable Restraint Sensing And Diagostic Module

17

FRT WPR

25A

Windshield Wiper/Washer Switch and Windshield Wiper Motor

18

PARK LPS

10A

IP Ashtray Lamp, Body Control Module, Outside Rear View Mirror Switch, Door Lock and Side Window Switch (RH/LH), and Side Window Lockout Switch

19

RDO/BAT

10A

Instrument Cluster, Electronic Climate Control Module, and Radio

20

--

--

Not Used

21

HVAC

10A

Inside Rear View Mirror, Inside Air Temperature Sensor, HVAC Solenoid Assembly, Air Temperature Valve Sensor and Motor, and Electronic Climate Control Module

22

--

--

Not Used

23

CLSTR

10A

Instrument Cluster, Vehicle Control Module, Brake Transmission Interlock Solenoid (Auto Trans), and Automatic Transmission

24

--

--

Not Used

A

--

--

Not Used

B

--

--

Not Used

Body Relay Block


Object Number: 390261  Size: LF

No.

Relay/Circuit Breaker

Rating

Description

1

Park Lamp Relay

--

BCM controlled, powers the Fog Lamp Relay (Rear), FR PRK LP, LR PRK LP, RR PRK LP, TRL PRK LP, and PRK LPS Fuses in IP Fuse Block, Park Lamp Switch Relay, and IP Dimmer Switch

2

Courtesy Lamp Relay

--

BCM controlled, grounds the Cargo Lamp, Map Light (part of the Driver Information Display Module), and Courtesy Lamp, (LH/RH) Console

3

Retained Accessory Power Relay

--

BCM controlled, switches IGN+ and B+ power to the RDO IGN fuse in the IP Fuse Block and Power Windows Circuit Breaker

4

Power Seats Circuit Breaker

30A

Powers the Power Seat Adjuster Switch, (LH/RH)

5

Power Windows Circuit Breaker

30A

Powers the Sunroof Module, Side Window Regulator Motor (LH/RH), Door Lock and Side Window Switch (RH), and Side Window Lockout Switch

6

Inadvertant Power Relay

--

BCM controlled, powers the IP Compartment Lamp, Sunshade Mirror Lamp (LH/RH), Underhood Lamp, and Courtesy Lamp Relay (coil side),

7

Door Lock Relay

--

BCM controlled, switches B+ and Ground to all Door Lock Actuators

8

Front Fog Lamp Relay

--

BCM controlled, powers Fog Lamp Bulb (LH/RH front) and Fog Lamp Switch (Front) on indicator lamp

9

Driver Door Unlock Relay

--

BCM controlled, switches B+ and Ground to the Door Lock Actuator, RH

10

Door Unlock Relay

--

BCM controlled, switches B+ and Ground to all Door Lock Actuators