GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC Sierra Denali 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E 🢒 Harness Routing Views
Figure 1:

Forward Lamp Harness
Object Number: 1326842 Size: LF
(1)Radiator Core Support
(2)Headlamp - High Beam - Right
(3)Repeater Lamp - RF (Export)
(4)A/C High Pressure Recirculation Switch
(5)Ambient Air Temperature Sensor - Mirror
(6)Headlamp - High Beam - Left
(7)C125
(8)Headlamp - Low Beam - Left
(9)C104
(10)Repeater Lamp - LF (Export)
(11)Junction Block - Underhood C4
(12)C103
(13)Park/Turn Signal Lamp - LF
(14)Marker Lamp - LF
(15)S100
(16)Windshield Washer Fluid Pump
(17)Washer Fluid Level Sensor
(18)Fog Lamp - LF
(19)G100
(20)Daytime Running Lamp (DRL) - Left
(21)Inflatable Restraint Front End Sensor - Left
(22)Inflatable Restraint Front End Sensor - Right
(23)Fog Lamp - RF
(24)Ambient Air Temperature Sensor - HVAC (CJ2)
(25)Daytime Running Lamp (DRL) - Right
(26)S101
(27)Park/Turn Signal Lamp - RF
(28)Marker Lamp - RF
(29)Headlamp - Low Beam - Right
(30)C127
Figure 2:

LR of the Engine Compartment (9L4)
Object Number: 1371094 Size: LF
(1)Brake/Clutch Harness
(2)C119
(3)I/P Harness
(4)Engine Harness
(5)Fuse Block - Underhood
(6)Negative Battery Cable Harness
(7)C117
(8)Accessory Jumper Harness
(9)C160
Figure 3:

LR of the Engine Compartment (5Y0)
Object Number: 1371090 Size: LF
(1)Brake/Clutch Harness
(2)Fuse Block - Underhood
(3)Emergency Vehicle Roof Lamp Relay
(4)C160
(5)C119
(6)C161
(7)Chassis Harness
Figure 4:

Battery Cable, 3 - Phase Cable, and Power Steering Pump Harnesses (HP2)
Object Number: 1361152 Size: LF
(1)3-Phase Cable
(2)Power Steering Pump Harness
(3)Auxiliary Battery Cable Jumpstart Lead
(4)Dash Panel
(5)Auxiliary Battery Cable Terminal to Fuse Block - Underhood
(6)Battery Cable Terminal to Fuse Block - Underhood
(7)Positive Battery Cable
(8)Negative Battery Terminal
(9)Power Steering Pump Connector C2
(10)G100
(11)G105
(12)Starter/Generator Rotor
(13)Starter/Generator Stator
(14)Battery Cable Harness
(15)C121
(16)C122
(17)Starter/Generator Control Module
Figure 5:

C100, C102 and C152
Object Number: 413351 Size: MF
(1)C102
(2)Fuse Block - Underhood Support Mount
(3)C152
(4)C100
Figure 6:

C104, C114, C150, C151, C153, C154, and PTO Relay
Object Number: 814636 Size: LF
(1)Fuse Block - Underhood
(2)C153 - Engine Harness to Transfer Case Harness
(3)C150 - Transfer Case Harness to Axle Jumper Harness
(4)Transfer Case Harness
(5)C151 - I/P Harness to Automatic Transfer Case Harness (w/NP8/NR4) or C104 - I/P Harness to Forward Lamp Harness (w/o NP8/NR4)
(6)C154 - I/P Harness to Automatic Transfer Case Harness (w/NP8/NR4) or C114 - Chassis Harness to I/P Harness (w/JL4/NYS)
(7)Power Take-Off (PTO) Relay
Figure 7:

Engine Harness - 4.3L
Object Number: 1402445 Size: LF
(1)Intake Air Temperature (IAT)/ Mass Air Flow (MAF) Sensor Connector
(2)Generator Connector
(3)Coolant Level Switch Connector
(4)Manifold Absolute Pressure (MAP) Sensor Connector
(5)A/C Low Pressure Switch Connector
(6)Auxiliary Battery Relay Connector (TP2)
(7)S102
(8)S103
(9)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Connector
(10)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Connector
(11)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Connector
(12)Vehicle Speed Sensor (VSS)
(13)Backup Lamp Switch (Manual Trans)
(14)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Connector
(15)Camshaft Position (CMP) Sensor Connector
(16)Engine Oil Pressure (EOP) Sensor Connector
(17)Engine Coolant Temperature (ECT) Sensor Connector
(18)Idle Air Control (IAC) Motor Connector
(19)S110
(20)Throttle Position (TP) Sensor Connector
(21)C153
(22)C100
(23)Fuse Block - Underhood C2
(24)C152
(25)Powertrain Control Module (PCM) C2
(26)Powertrain Control Module (PCM) C1
(27)A/C Compressor Clutch Connector
(28)A/C Refrigerant Pressure Sensor Connector
Figure 8:

Lower Right Side of the Engine (6.6L)
Object Number: 768355 Size: MF
(1)Engine - 6.6L Diesel
(2)Engine Harness
(3)G102
(4)Auxiliary Negative Battery Ground
(5)Starter Relay Terminal
(6)Starter Solenoid
Figure 9:

Left Side of the Engine (4.8, 5.3, and 6.0L)
Object Number: 1402455 Size: LF
(1)Generator Connector
(2)Evaporative Emission (EVAP) Canister Purge Soleniod
(3)S104
(4)C148
(5)Manifold Absolute Pressure (MAP) Sensor Connector
(6)Knock Sensor (KS) Connector
(7)Knock Sensor (KS) Connector
(8)G104
(9)Camshaft Position (CMP) Sensor Connector
(10)Throttle Actuator Control (TAC) Connector
(11)C153
(12)G102
(13)C100
(14)Fuse Block - Underhood C2
(15)C152
(16)Powertrain Control Module (PCM) C2
(17)Powertrain Control Module (PCM) C1
(18)S110
(19)S103
Figure 10:

Right Side of the Engine (4.8, 5.3, and 6.0L)
Object Number: 1402457 Size: LF
(1)Manifold Absolute Pressure (MAP) Sensor Connector
(2)S102
(3)Auxiliary Battery Relay Connector (TP2)
(4)Evaporative Emission (EVAP) Canister Purge Soleniod
(5)Throttle Actuator Control (TAC) Connector
(6)Coolant Level Switch Connector
(7)Intake Air Temperature (IAT)/ Mass Air Flow (MAF) Sensor Connector
(8)A/C Refrigerant Pressure Sensor Connector
(9)A/C Compressor Clutch Connector
(10)A/C Low Pressure Switch Connector
(11)Engine Oil Level Switch Connector
(12)Camshaft Position (CMP) Sensor Connector
(13)Engine Oil Pressure (EOP) Sensor Connector
Figure 11:

Rear of the Engine (4.8, 5.3, and 6.0L)
Object Number: 1402460 Size: LF
(1)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Connector (Automatic)
(2)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Connector (Automatic)
(3)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Connector (Manual)
(4)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Connector (Manual)
(5)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Connector (Manual)
(6)Vehicle Speed Sensor (VSS) Connector
(7)Backup Lamp Switch Connector
(8)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Connector (Manual)
(9)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Connector (Automatic)
(10)Park/Neutral Position Switch Connector
(11)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Connector (Automatic)
Figure 12:

Left Side of the Engine (LLY)
Object Number: 1870344 Size: LF
(1)A/C Compressor Clutch Connector
(2)A/C Refrigerant Pressure Sensor Connector
(3)Intake Air Temperature (IAT)/ Mass Air Flow (MAF) Sensor Connector
(4)Generator - Left Connector
(5)Coolant Level Switch
(6)C108
(7)A/C Low Pressure Switch Connector
(8)S118
(9)C107
(10)Throttle Actuator Control (TAC) Module Connector
(11)Backup Lamp Switch Connector
(12)Vehicle Speed Sensor (VSS) Connector
(13)S127
(14)C100
(15)Fuse Block - Underhood C2
(16)G104
(17)C152
(18)S103
(19)Engine Control Module (ECM) C1 Connector
(20)Engine Control Module (ECM) C2 Connector
(21)Engine Control Module (ECM) C3 Connector
(22)S164
(23)S102
(24)S148
(25)S147
(26)S119
(27)Generator - Right Connector
Figure 13:

Right Side of the Engine (LLY)
Object Number: 1402731 Size: LF
(1)S127
(2)Throttle Actuator Control (TAC) Module Connector
(3)C108
(4)C107
(5)C153
(6)C100
(7)Fuse Block - Underhood C2
(8)C152
(9)Glow Plug Controller Power
(10)Generator - Right Connector
(11)S141
(12)A/C Refrigerant Pressure Sensor Connector
(13)Engine Control Module (ECM) C3 Connector
(14)Engine Control Module (ECM) C2 Connector
(15)Engine Control Module (ECM) C1 Connector
(16)A/C Compressor Clutch Connector
(17)Generator - Left Connector
(18)Intake Air Temperature (IAT)/Mass Air Flow (MAF) Sensor Connector
(19)G102
(20)Coolant Level Switch Connector
(21)A/C Low Pressure Switch Connector
Figure 14:

Left Side of the Engine (LB7)
Object Number: 1403191 Size: LF
(1)Intake Air Temperature (IAT)/ Mass Air Flow (MAF) Sensor Connector
(2)A/C Compressor Clutch Connector
(3)Coolant Level Switch Connector
(4)Generator - Left Connector
(5)A/C Refrigerant Pressure Sensor Connector
(6)Generator - Right Connector
(7)C107
(8)A/C Low Pressure Switch Connector
(9)C108
(10)S102
(11)PTO Relay
(12)Glow Plug Controller Power
(13)Throttle Actuator Control (TAC) Module Connector
(14)Automatic Transmission Input Shaft Speed (AT ISS) Sensor Connector
(15)Automatic Transmission Turbine Speed Sensor Connector
(16)C145
(17)Automatic Transmission Output Speed Sensor Connector
(18)Park/Neutral Position (PNP) Switch Connector
(19)C100
(20)Fuse Block - Underhood C2
(21)C152
(22)C106
(23)S103
(24)G104
(25)Engine Control Module (ECM) C1
(26)Engine Control Module (ECM) C2
(27)Transmission Control Module (TCM) C1
(28)Transmission Control Module (TCM) C2
(29)S163
Figure 15:

Left Side of the Engine (8.1L)
Object Number: 1398839 Size: LF
(1)S163 (PTO)
(2)S132
(3)S164 (PTO)
(4)S102
(5)S151
(6)S103
(7)C155
(8)Fuse Block - Underhood C2
(9)PTO Relay Connector
(10)S104
(11)Throttle Actuator Control (TAC) Module C1
(12)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
(13)Knock Sensor (KS) - Bank 1
(14)C100
(15)C152
(16)C106 (PTO)
(17)S165 (M74)
(18)S110
(19)G102
(20)Powertrain Control Module (PCM) C2
(21)Powertrain Control Module (PCM) C1
(22)Transmission Control Module (TCM) C1
(23)Transmission Control Module (TCM) C2
Figure 16:

Right Side of the Engine (8.1L)
Object Number: 1398841 Size: LF
(1)Auxiliary Battery Relay Connector (TP2)
(2)A/C Low Pressure Switch Connector
(3)Manifold Absolute Pressure (MAP) Sensor
(4)Engine Coolant Temperature (ECT) Sensor
(5)C149
(6)S157
(7)Coolant Level Switch Connector
(8)S160
(9)Throttle Actuator Control (TAC) Motor Connector C1
(10)C153
(11)A/C Compressor Clutch Connector
(12)A/C Refrigerant Pressure Sensor Connector
(13)Knock Sensor (KS) - Bank 2
(14)Engine Oil Level Switch Connector
(15)Starter Solenoid Power
(16)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
Figure 17:

Rear of the Engine (8.1L)
Object Number: 1399200 Size: LF
(1)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
(2)Automatic Transmission Input Shaft Speed (At ISS) Sensor
(3)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2
(4)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2
(5)Vehicle Speed Sensor (VSS)
(6)Park Neutral Position (PNP) Switch Connector
(7)C145
(8)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
Figure 18:

SEO Harness Routing
Object Number: 1370946 Size: LF
(1)C202
(2)Stop Lamp Switch Connector
(3)C160 (5X7, 5Y0)
(4)C119 (9L4)
(5)C250
(6)C216
(7)S223
(8)S220
(9)Roof Beacon Switch Connector (5X7, 5Y0, 5G4, TRW)
(10)Dash Panel
(11)Fuse Block - Mobile Radio (9L4)
(12)S222
(13)S221
(14)Blunt Cut Wires (9L4)
(15)Relay Block - I/P C5
(16)Relay Block - I/P C8
(17)C210
(18)Park Brake Switch Connector
(19)Clutch Pedal Position (CPP) Switch
Figure 19:

Instrument Panel
Object Number: 894047 Size: LF
(1)C104 (YE9)
(2)C106 (PTO)
(3)Fuse Block Underhood - C1
(4)C115 (NYS)
(5)C105 (LB7)
(6)S214 (NP8)
(7)S202
(8)P110
(9)S213
(10)S205
(11)C222 (Except HP2)
(12)C209 (Z55 or E52)
(13)C306
(14)C249
(15)S210 (UQ7 and Y91)
(16)C201
(17)S218
(18)C221
(19)C206 (Y91 or HP2)
(20)S212 (NYS)
(21)P100
(22)C154 (NP1 or NP8)
(23)C102
Figure 20:

Left Front Door Harness
Object Number: 1461388 Size: LF
(1)Door Latch Assembly
(2)Door Frame
(3)Fuse Block - I/P C3
(4)Power Window Motor Connector
Figure 21:

Right Front Door Harness
Object Number: 1461389 Size: LF
(1)Door Frame
(2)Door Latch Assembly
(3)Power Window Motor Connector
(4)Junction Block - I/P C2
Figure 22:

Driver Seat (1 of 2)
Object Number: 854624 Size: LF
(1)C321
(2)Seat Adjuster Switch - Driver
(3)Memory Seat Module - C4
(4)Memory Seat Module - C3
(5)Seat Bolster/Lumbar Switch - Driver
(6)Seat Recliner Motor - Driver
(7)C305
(8)C323
(9)C325
(10)C322
(11)Seat Rear Vertical Motor - Driver
(12)Seat Front Vertical Motor - Driver
(13)Memory Seat Module - C2
(14)Memory Seat Module - C1
(15)Seat Horizontal Motor - Driver
(16)C320
Figure 23:

Driver Seat (2 of 2)
Object Number: 854618 Size: LF
(1)Seat Bolster Motor - Driver
(2)Seat Lumbar Motor - Driver
(3)Heated Seat Element - Driver Cushion
(4)C324
(5)Seat Belt Switch Connector
(6)Heated Seat Element - Driver Cushion Connector
Figure 24:

Front Passenger Seat (1 of 2) (w/ AN3)
Object Number: 854616 Size: LF
(1)Seat Horizontal Motor - Front Passenger
(2)Seat Front Vertical Motor - Front Passenger
(3)Seat Rear Vertical Motor - Front Passenger
(4)C388
(5)C326
(6)C399
(7)Seat Recliner Motor - Front Passenger
(8)Seat Adjuster Switch - Front Passenger
(9)Seat Adjuster Switch Connector
Figure 25:

Front Passenger Seat (2 of 2) (w/ AN3)
Object Number: 854613 Size: LF
(1)Seat Bolster Motor - Front Passenger
(2)Seat Lumbar Motor - Front Passenger
(3)Heated Seat Element - Front Passenger Cushion Connector
(4)C329
Figure 26:

Console Harness
Object Number: 1407819 Size: LF
(1)Auxiliary Power Outlet - Front Connector
(2)S333
(3)S307
(4)S303
(5)Rear Seat Audio (RSA) Controller Connector
(6)Auxiliary Power Outlet - Console Connector
(7)Audio Amplifier Connector C2
(8)Audio Amplifier Connector C1
(9)Cigar Lighter
(10)C306
(11)Speaker - Subwoofer Connector
(12)Speaker - Subwoofer (UQ7)
Figure 27:

Chassis and License Lamp Harnesses
Object Number: 1326843 Size: LF
(1)Suspension Damper Solenoid - RF (ZX3)
(2)Wheel Speed Sensor (WSS) - RF
(3)Suspension Damper Solenoid - RR (ZX3)
(4)License Lamp - Right
(5)G401
(6)License Lamp - Left
(7)Junction Block - Rear Lamps C3
(8)Suspension Damper Solenoid - LR (ZX3)
(9)Fuel Pump and Sender Assembly/Fuel Tank Pressure (FTP) Sensor Connectors
(10)Evaporative Emission (EVAP) Canister Vent Solenoid
(11)S312
(12)Electronic Brake Control Module (EBCM)
(13)Stud #1 Trailer Connector
(14)C198
(15)Fuse Block - Underhood C9
(16)Fuse Block - Underhood C3
(17)C102
(18)Wheel Speed Sensor (WSS) - LF
(19)Suspension Damper Solenoid - LF (ZX3)
(20)C152
(21)S140
(22)Brake Pressure Differential Switch
Figure 28:

Energy Storage Box (ESB), 42V, and Accessory Power Receptacle Harnesses (HP2)
Object Number: 1361153 Size: LF
(1)S430
(2)Chassis
(3)S330
(4)Energy Storage Box (ESB)
(5)Battery Cable Harness (42V)
(6)P105
(7)C140
(8)Starter/Generator Control Module
(9)C122
(10)C121
(11)S121
(12)Accessory Power Receptacle Harness
(13)S120
(14)S326
(15)S332
(16)S331
(17)C341
(18)Accessory Power Receptacle Connector
Figure 29:

Headliner and Brake/Clutch Harnesses
Object Number: 1327860 Size: LF
(1)C355
(2)S345
(3)Courtesy/Reading Lamp - Rear Connector
(4)Headliner
(5)Center High Mounted Stop Lamp (CHMSL) Connector
(6)Driver Side B - Pillar Molding
(7)S321
(8)Relay Block - I/P Connectors - C3 and C4
(9)Park Brake Switch Connector
(10)Stop Lamp Switch Connector
(11)C205 (HP2)
(12)C214
(13)Inside Rearview Mirror Connector
Figure 30:

Body Harness
Object Number: 1327859 Size: LF
(1)Fuse Block - I/P C4
(2)G304
(3)G330 (AL0)
(4)G399 (AG2)
(5)C396
(6)G306
(7)Headliner
(8)Rear Window Defogger Grid Connector (Crew Cab)
(9)Floor Panel
(10)G305
(11)C310
(12)C305
(13)Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(14)C221
(15)C223
(16)Relay Block - I/P C10
(17)C222
(18)Body Control Module (BCM) C6
Figure 31:

C210 and Relay Block - I/P - C4
Object Number: 814939 Size: LF
(1)Relay Block - I/P
(2)Relay Block - I/P - C4
(3)C210 - Roof Beacon Relay Inline