GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Ground Views
Figure 1:

Ground Zones
Object Number: 1326821 Size: LF
(1)G202/G200
(2)G102
(3)G103
(4)G205
(5)G203
(6)G106
(7)G400 (C4/C5)
(8)G400 (C6/C7/C8)
(9)G400 (LF6/LF8)
(10)G204
(11)G112
(12)G105
(13)G101
(14)G100 (LF6)
(15)G100 (RH Side of Engine Block - LMM)
Figure 2:

Battery Cable Harness Routing (L18/TNL/TNN)
Object Number: 1593954 Size: LF
(1)Left Hand Frame Rail
(2)Junction Block - Underhood
(3)G100
(4)Battery Box
Figure 3:

Chassis Front Engine Compartment
Object Number: 2175273 Size: LF
(1)X108
(2)X106
(3)G100
(4)Wheel Speed Sensor (WSS) - Right Front
(5)X100
(6)X126
(7)Power Brake (P/B) Booster Fluid Flow Switch (JE3)
(8)Brake Fluid Level Switch (JE3)
(9)Hydromax Relay (JE3)
(10)Water in Fuel Sensor
(11)X410
(12)Electronic Brake Control Module (EBCM)
(13)Wheel Speed Sensor (WSS) - Left Front
(14)ABS Relay (JE4)
(15)X107
Figure 4:

Cross Body Harness - Right
Object Number: 1559155 Size: LF
(1)J219
(2)J300
(3)J506
(4)J500
(5)X212 (22 cavities) Door Harness - Passenger to the Cross Body Harness
(6)G103
(7)X207 (30 cavities) I/P Harness to the Cross Body Harness
Figure 5:

Chassis Front Engine Compartment
Object Number: 1558088 Size: LF
(1)X108 (5 cavities) Chassis Harness to the Forward Lamp Harness - Right
(2)X106 (6 cavities - C4/C5, 12 cavities - C6/C7/C8) Radiator Harness to the Chassis Harness
(3)G100
(4)Wheel Speed Sensor (WSS) - Right Front Connector
(5)X100 (30 cavities) Chassis Harness to the Engine Harness
(6)X126 (40 cavities) Chassis Harness to I/P Harness
(7)Brake Fluid Level Switch (JE3)
(8)Power Brake (P/B) Booster Fluid Flow Switch (JE3)
(9)Hydromax® Relay (JE3)
(10)X410 (3 cavities) Chassis Harness to Air Compressor Harness (K16)
(11)Wheel Speed Sensor (WSS) - Left Front Connector
(12)Electronic Brake Control Module (EBCM) Connector
(13)X107 (5 cavities) Chassis Harness to Forward Lamp Harness - Left
Figure 6:

Fuel Senders, G400, Low Air Alarms, Splice Pack SP400 (Ground Block) - LG4/LG5


Object Number: 1963829 Size: LF
(1)Fuel Sender - Primary
(2)Fuel Tank
(3)Low Air Pressure Switch - Primary
(4)Low Air Pressure Switch - Secondary
(5)Splice Pack JX400 (Ground Block - 6 cavities)
(6)Fuel Sender - Secondary Connector
(7)Ground G400
(8)Fuel Sender - Secondary
(9)Fuel Tank - Secondary
Figure 7:

Fuel Sender Harness
Object Number: 1559707 Size: LF
(1)J418
(2)J407
(3)X420 Fuel Sender Harness to Chassis Harness
(4)J420
(5)G400
(6)Fuel Tank - Secondary
(7)J408
(8)Fuel Tank - Primary
Figure 8:

Fuel Tank Harness Routing (L18/NK1)
Object Number: 1594015 Size: LF
(1)Right Hand Frame Rail
(2)X409 (8 cavities) Fuel Tank Harness to the Chassis Harness
(3)G408
(4)X406 (4 cavities - HPZ/HR1/HR2) Chassis Harness to the Rear Axle Harness
(5)Fuel Tank
Figure 9:

G119 (LMM)
Object Number: 1964755 Size: LF
(1)Exhaust Manifold
(2)G119
Figure 10:

G120 (LMM)
Object Number: 1964758 Size: LF
(1)Crankshaft Pulley
(2)G120
Figure 11:

I/P Harness
Object Number: 1963771 Size: LF
(1)Fuse Block - Underhood (Secondary)
(2)Blower Motor Resistor Assembly (C40/C60)
(3)X207 (30 cavities)
(4)Inflatable Restraint I/P Module (AK5)
(5)Fuse Block - I/P - 1
(6)Fuse Block - I/P - 2
(7)Air Brake Pressure Gage Lamp (JE4), Differential Lock Switch Lamp (HNB/HPL/HPN), Inter-Axle Differential Lock Switch Lamp (Tandem Axle), Rear Axle Driver Control Switch Lamp - Two Speed (HR1/Automatic Transmission)
(8)HVAC Control Assembly (C40/C60)
(9)Turn Signal/Hazard Flasher Module
(10)Daytime Running Lights (DRL) Diode
(11)Instrument Panel Cluster (IPC)
(12)Headlamp Switch
(13)Daytime Running Lights (DRL) Module
(14)JX 203 (12 cavities)
(15)X201 (48 cavities)
(16)Inflatable Restraint Steering Wheel Module (AJ3/AK5)
(17)X211 (22 cavities)
(18)X215 (8 cavities)
(19)X150 (4 cavities)
(20)Accelerator Pedal Position (APP) Sensor
(21)Radio
(22)Serial Data Gateway (SDG)
(23)Driver Information Center (DIC)
(24)Engine Control Module (ECM)
(25)X126 (40 cavities)
(26)X109 (40 cavities)
(27)X200
(28)X118
(29)G102
Figure 12:

I/P Harness 1 of 3
Object Number: 1559694 Size: LF
(1)J261
(2)J232
(3)J264
(4)J259
(5)J217
(6)J204
(7)J252
(8)J223
(9)J202
(10)J412
(11)J220
(12)J203
(13)J222
(14)J253
(15)J230
(16)X206 (4 cavities) I/P Harness to the Body/Roof Harness
(17)G101
(18)Park Brake Switch Connector (C4/C5 and JE3) or X210 (2 cavities) I/P Harness to the Park Brake Harness (C6/C7/C8 and JE3)
(19)X203 (16 cavities) I/P Harness to Body/Roof Harness
(20)J240
Figure 13:

Left Front Kick Panel
Object Number: 1964324 Size: LF
(1)Headlamp Switch Connector
(2)Daytime Running Lights (DRL) Module
(3)JX203 (12 cavities)
(4)Chime Module Connector
(5)Turn Signal/Hazard Flasher Module
(6)Stop Lamp Switch
(7)Accelerator Pedal Position (APP) Sensor
(8)X215 (8 cavities)
(9)Park Brake Switch (JE3) (C4/C5)
(10)G202
(11)X211 (22 cavities)
(12)Clutch Pedal Position (CPP) Switch
(13) X275 (2 cavities - AJ3/AK5)
Figure 14:

Left Side of Engine (LF8)
Object Number: 1965055 Size: LF
(1)X122
(2)Manifold Absolute Pressure (MAP) Sensor
(3)X123
(4)Engine Control Module (ECM) X2
(5)Intake Manifold Temperature (IMT) Sensor
(6)Fuel Temperature Sensor
(7)Suction Control Valve (SCV)
(8)Crankshaft Position (CKP) Sensor
(9)G100
(10)Oil Level Switch
(11)X111
(12)Fuel Rail Pressure (FRP) Sensor
(13)Water in Fuel Sensor
(14)Glow Plug Control Module
(15)Exhaust Gas Recirculation (EGR) Valve
Figure 15:

Rear of Engine Block
Object Number: 1964887 Size: LF
(1)Engine Oil Pressure (EOP) Switch
(2)Engine Chassis Harness
(3)Engine Oil Pressure (EOP) Switch Connector
(4)Crankshaft Position (CKP) Sensor Connector
(5)G115
(6)Heated Oxygen Sensor (HO2S) Bank 1
(7)Crankshaft Position (CKP) Sensor