GM Service Manual Online
For 1990-2009 cars only

Because more than one electrical system is located in each subsection, each electrical system's schematics are further broken down into operating systems, or cells. Each set of electrical system schematics will have a cell number that remains common across all vehicle platforms. Cells are organized by subsystems with most cells containing a circuit schematic and the associated text. For example, the cruise control schematic will be located in the cruise control subsection and the schematic title will begin with Cell 34.

Some subsections may have more than one circuit schematic such as Power Distribution, Interior Lights and Air Conditioning.

Electrical Schematic Locations

Cell No.

System Name

Section

Subsection

11

Fuse Block Details Schematics

Body and Accessories

Wiring Systems

14

Ground Distribution Schematics

Body and Accessories

Wiring Systems

15

Retained Accessory Power Schematics

Body and Accessories

Retained Accessory Power

17

Auxiliary Battery Schematics

Body and Accessories

Wiring Systems

18

Upfitter Provision Schematics

Body and Accessories

Wiring systems

19

Cigar Lighter/Auxiliary Outlet Schematics

Body and Accessories

Wiring Systems

20

Engine Controls Schematics

Engine

Engine Controls

30

Starting and Charging Schematics

Engine

Engine Electrical

31

Cooling fan Schematics

Engine

Engine Cooling

32

Radiator Shutter Schematics

Engine

Engine Cooling

33

Engine Exhaust Brake Schematics

Brakes

Engine Exhaust

34

Cruise Control Schematics

Body and Accessories

Cruise Control

35

Manual Transmission Schematics

Transmission Transaxle

Manual Transmission

36

Inter-Axle Differential Lock Schematics

Driveline/Axle

Rear Axle Controls

37

Two Speed Rear Axle Schematics

Driveline/Axle

Rear Axle Controls

38

Transfer Case Control Schematics

Driveline/Axle

Transfer Case

39

Automatic Transmission Controls Schematics

Transmission/Transaxle

Automatic Transmission or Automatic Transaxle

40

Horn Schematics

Body and Accessories

Horns

41

Brake Warning System Schematics

Brakes

Hydraulic Brakes or Air Brakes

42

ALC Suspension Schematics

Suspension

Automatic Level Control

43

Suspension Controls Schematics

Suspension

Road Sensing Suspension - RSS Real Time Dampening - RTD Air Suspension

44

ABS Schematics ABS/TCS Schematics

Brakes

ABS Traction Control

45

Steering Control Schematics

Steering

Variable Effort Steering

46

Park Brake System Schematics

Brakes

Park Brakes

47

SIR Schematics SRS Schematics

Restraints

SIR

48

Tire Pressure Monitor System

Suspension

Tire Pressure Monitor

49

Tilt/Telescoping Steering Column Schematics

Steering

Steering Wheel and Column Tilt

50

Data Link Connector (DLC) Schematics

Body and Accessories

Wiring Systems

51

Body Control Module Schematics

Body and Accessories

Body Control System

55

Door Control Module Schematics

Body and Accessories

Doors

57

Brake Booster Pump Schematics

Brakes

Hydraulic Brakes

58

Air Brake System Schematics

Brakes

Air Brakes

60

Heater Blower Controls Schematics

HVAC

Heater and Ventilation (Non-A/C)

61

Defogger Schematics

Body and Accessories

Stationary Windows

62

Heated Windshield Schematics

Body and Accessories

Stationary Windows

63

HVAC Blower Controls Schematics

HVAC

HVAC Systems with A/C Manual

64

HVAC Compressor Controls Schematics HVAC Compressor/Condenser Fan Controls Schematics

HVAC

HVAC Systems with A/C Manual

65

HVAC Air Delivery Controls Schematics

HVAC

HVAC Systems with A/C Manual

66

HVAC Blower Controls Schematics

HVAC

HVAC Systems with A/C-Automatic (Includes Electronic and Dual Zone)

67

HVAC Compressor Controls Schematics HVAC Compressor/Condenser Fan Controls Schematics

HVAC

HVAC Systems with A/C Automatic (Includes Electronic and Dual Zone)

68

HVAC Air Delivery Controls Schematics

HVAC

HVAC Systems with A/C-Automatic (Includes Electronic and Dual Zone)

70

Collision Avoidance Schematic

Body and Accessories

Collision Avoidance

76

Audible Warnings Schematics

Body and Accessories

Instrument Panel, Gauges and Console

79

Backup Alarm System Schematics

Body and Accessories

Backup Alarm

81

Instrument Cluster: Analog Schematics

Body and Accessories

Instrument Panel, Gauges and Console

82

Instrument Cluster: Digital Schematics

Body and Accessories

Instrument Panel, Gauges and Console

83

Head Up Display Schematics

Body and Accessories

Instrument Panel, Gauges and Console

85

Navigation System Schematic

Body and Accessories

Instrument Panel, Gauges and Console

86

Driver Information System Schematics

Body and Accessories

Instrument Panel, Gauges and Console

90

Wiper/Washer System (Standard) Schematics

Body and Accessories

Wiper/Washer Systems

91

Wiper/Washer System (Pulse) Schematics

Body and Accessories

Wiper/Washer Systems

92

Wiper/Washer System (Rear) Schematics

Body and Accessories

Wiper/Washer Systems

93

Headlamp Washer Schematics

Body and Accessories

Wiper/Washer Systems

100

Headlights Schematics

Body and Accessories

Wiper/Washer Systems

101

Headlights Twilight Sentinel/DRL Schematics

Body and Accessories

Lighting Systems

102

Headlights DRL Schematics

Body and Accessories

Lighting Systems

103

Fog Lights Schematics

Body and Accessories

Lighting Systems

104

Headlight Doors Schematics

Body and Accessories

Lighting Systems

105

Headlight Leveling Schematics

Body and Accessories

Lighting Systems

110

Exterior Lights Schematics

Body and Accessories

Lighting Systems

112

Backup Lights Schematics

Body and Accessories

Lighting Systems

114

Interior Lights Schematics

Body and Accessories

Lighting Systems

117

Interior Lights Dimming Schematics

Body and Accessories

Lighting Systems

120

Power Windows Schematics

Body and Accessories

Doors

121

Power Folding Top Schematics

Body and Accessories

Roof

122

Power Sunroof Schematics

Body and Accessories

Roof

130

Door Locks Schematics

Body and Accessories

Door Locks

132

Keyless Entry Schematics

Body and Accessories

Keyless Entry

133

Theft Deterrent System Schematics

Body and Accessories

Theft Deterrent

134

Release System Schematics

Body and Accessories

Body Rear End

135

Pull down Systems Schematics

Body and Accessories

Body Rear End

136

Garage Door Opener Schematics

Body and Accessories

Garage Door Opener

137

Power Sliding Door (PSD) Schematics

Body and Accessories

Doors

138

BTSI Schematics

Steering

Steering Wheel and Column Standard Steering Wheel and Column Tilt

139

Column/Ignition

Steering

Steering Wheel and Column Standard Steering Wheel and Column Tilt

140

Power Seat Schematics

Body and Accessories

Seats

141

Memory Seats Schematics

Body and Accessories

Seats

142

Lumbar Support Schematics

Body and Accessories

Seats

143

Heated Seats Schematics

Body and Accessories

Seats

146

Power Seat Schematics

Restraints

Seat Belts

147

Outside Mirrors Schematics

Body and Accessories

Doors

148

Automatic Day-Night Mirror

Body and Accessories

Stationary Windows

150

Radio/Audio Systems Schematics

Body and Accessories

Entertainment

151

Power Antenna Schematics

Body and Accessories

Entertainment

152

Steering Wheel Controls Schematics

Body and Accessories

Entertainment

153

Cellular Telephone Schematics

Body and Accessories

Cellular Communications

154

On Star Schematics

Body and Accessories

Cellular Communications