GM Service Manual Online
For 1990-2009 cars only

Object Number: 612696  Size: MF
Figure 1:

Electrical Components


Object Number: 796325  Size: MF
(1)In-line Connector C004
(2)In-line Connector C005
(3)In-line Connector C006
(4)Injector Relay 2 Connector C024
(5)Lock-off Solenoid Relay Connector C020
(6)Injector Relay 1 Connector C019
(7)AF Fuel Pump Relay Connector C021
(8)Fuel Tank Pressure Sensor Connector C034
(9)Fuel Tank Pressure (FTP) Sensor
(10)CNG Fuel Tank
(11)High Pressure Lock-off (HPL) Solenoid Connector C032
(12)High Pressure Lock-off (HPL) Solenoid
(13)Fuel Tank Temperature (FTT) Sensor Connector C033
(14)Low Pressure Lock-off (LPL) Solenoid Connector C031
(15)Low Pressure Lock-off (LPL) Solenoid
(16)Intermediate Pressure Regulator (IPR)
(17)Fuel Rail Pressure (FRP) Sensor Connector C009
(18)Left Hand Gaseous Fuel Rail
(19)Gaseous Fuel Injector
(20)Gaseous Fuel Injector Connector C010 - C017
(21)Fuel Rail Temperature (FRT) Sensor Connector C008
(22)Alternative Fuels Engine Control Module (ECM)
(23)Alternative Fuels Engine Control Module Connector C003
(24)Alternative Fuels Engine Control Module Connector C002
(25)Alternative Fuels Engine Control Module Connector C001
Figure 2:

Fuel System Components


Object Number: 796324  Size: MF
(1)Left Hand Gaseous Fuel Rail
(2)Right Hand Gaseous Fuel Rail
(3)Gaseous Fuel Injector (1 of 8)
(4)High Pressure Regulator (HPR) Coolant Lines
(5)High Pressure Regulator (HPR)
(6)In-line CNG Fuel Filter
(7)High Pressure Lock-off (HPL) Fitting CNG Fuel Line
(8)Pick-up Box Floor
(9)CNG Fuel Fill Valve
(10)CNG Fuel Fill Line
(11)Left Hand Vehicle Frame Rail
(12)Chassis CNG Fuel Line
(13)Chassis Fuel Line Pick-up Box Pass-through
(14)Low Pressure Lock-off (LPL) Solenoid CNG Fuel Line Inlet Fitting
(15)Low Pressure Lock-off (LPL) Solenoid
(16)Intermediate Pressure Regulator (IPR)
Figure 3:

Instrument Panel Components


Object Number: 796329  Size: SF
(1)Fuel Indicator Lamp (FIL) (KL6)
(2)Fuel Gage
(3)Fuel Gage Select Switch (KL6)

Fuse Block - Underhood Fuse Application

Fuse/Circuit Breaker

Rating

Description

Important:: Numbers shown are to reference position only - component not marked.

STUD 1 Fuse #1

40A

Trailer Wiring / Automatic Level Control Compressor

ABS Fuse #2

60A

Brake Pressure Modulator Valve (Pump)

IGN A Fuse #3

40A

Starter Relay, Ignition Switch-IGN 1, TURN, SEO IGN Fuses

AFS Fuse #4

20A

Alternative Fuels Lock-Off Solenoid Relay and Lock-Off Solenoids

RAP Fuse #5

50A

Rap Relay, MIR/LOCK DR LOCK Fuses and SEATS Circuit Breaker

IGN B Fuse #6

50A

Ignition Switch-Rap Relay, Wiper/Washer and SEO ACCY Fuses

RAP 2 Fuse #7

50A

Power Window RF switch,Power Window RR Switch,Power Sunroof

STUD 2 Fuse #8

30A

Body Wiring Provisions, Trailer Wiring

TRL R TRN Fuse #9

10A

Trailer Turn and Stop

TRL L TRN Fuse #10

10A

Trailer Turn and Stop

COIL B Fuse #11

15A

Gasoline Fuel Injectors 2, 4, 6, and 8 (KL6), Ignition Coils,

PARK LP Fuse #12

30A

Park Lamp Relay, Headlamp and Panel Dimmer Switch-Park Lamps

FRT HVAC Fuse #13

30A

Blower Motor (High Speed)

STOP LP Fuse #14

20A

VEH STOP and CHMSL Fuses, Trailer Wiring (LH, RH Turn and Stop Lamp)

ECM 1 Fuse #15

10A

Powertrain Control Module (PCM)-from IGN 1 Relay

CHMSL Fuse #16

10A

Center High Mounted Stop Lamp

VEH STOP Fuse #17

10A

Vehicle Stop Lamps

TRL B/U Fuse #19

10A

Trailer Backup Lamps

COIL A Fuse #20

15A

Gasoline Fuel Injectors 1, 3, 5, and 7 (KL6), Ignition Coils

RR HVAC Fuse #21

30A

Rear Heater,Rear Blower Relays

VEH B/U Fuse #22

15A

Vehicle Backup Lamps

ENG 1 Fuse #23

10A

Mass Air Flow (MAF) Sensor, Camshaft Position (CMP) Sensor, Evaporator Emission (EVAP) Canister Vent Valve, Evaporative Emission (EVAP) C Purge Valve

IGN E/AFS Fuse #25

10A

A/C Compressor Clutch Relay, DRL Relay, Rear Defog Relay

Alternative Fuels - Injector 1 Relay, Injector 2 Relay, AF Fuel Pump Relay, Alternative Fuels Engine Control Module (ECM)

B/U LP Fuse #26

25A

Backup Lamps, BTSI fuse

ATC Fuse #27

20A

Automatic Transfer Case (ATC) Control Module, Encoder Motor

RR PRK Fuse #29

10A

RR Park Lamps

ECM B/AFS Fuse #30

20A

Fuel Pump Relay, Powertrain Control Module (PCM)

Alternative Fuels Engine Control Module (ECM)

O2 A Fuse #31

15A

Heated Oxygen Sensors

O2 B Fuse #32

15A

Heated Oxygen Sensors

LR PRK Fuse #33

10A

LR Park Lamps

RR DEFOG Fuse #34

30A

Rear Window Defogger

TRL PRK Fuse #35

15A

Trailer Park

PRIME #36

--

Fuel Pump Prime Port

RT HDLP Fuse #37

15A

RH Headlamps (Hi and Low)

HTD MIR Fuse #38

10A

Heated Outside Mirrors

LT HDLP Fuse #39

15A

LH Headlamps (Hi and Low)

A/C Fuse #40

10A

A/C Compressor Clutch

AUX PWR Fuse #41

20A

Auxiliary Power Outlets

SEO 2 Fuse #42

30A

Roof Beacon and Relay, Full Feature Seat - LH and RH

SEO 1 Fuse #43

15A

Roof Beacon Switch, Cellular Phone Wiring Provisions

DRL Fuse #44

10A

Daytime Running Lamps (DRL)

FOG LPS Fuse #45

15A

Fog Lamps

RADIO Fuse #46

15A

Radio and Instrument Cluster

CIGAR Fuse #47

15A

Data Link Connector, Cigar Lighter

RT TURN Fuse #48

10A

RH Turn Signals

BTSI Fuse #49

10A

Brake Transmission Shift Interlock Solenoid

LT TURN Fuse #50

10A

LH Turn Signals

FR PRK Fuse #51

10A

Front Park Lamps

W/W PMP Fuse #52

15A

Windsheild Washer Pump

IGN C Fuse #53

20A

Ignition Switch, Crank, IGN 0 Fuses

RDO AMP Fuse #54

25A

Radio/Audio Systems Amplifier

HAZ LP Fuse #55

20A

Hazard Lamps

EXP LPS Fuse #56

10A

Not Used

HORN Fuse #57

15A

Horn/Horn Relay

CTSY LP Fuse #58

15A

Inadvertent Power Relay (Courtesy Lamps)

RR WPR Fuse #59

25A

RR Wiper Washer,RR Wiper Motor

TBC Fuse #60

10A

Body Control Module