GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 TopKick C-Series (Conventional) C4/C5 🢒 HVAC 🢒 HVAC - Manual 🢒 Engine Controls Component Views
Figure 1:

Automatic Transmission Harness, Upper Left Rear View
Object Number: 228797 Size: LF
(1)Backup Lamps Switch
(2)Vehicle Speed Sensor (VSS)
(3)Neutral Switch
(4)Front Chassis Harness
Figure 2:

Accelerator Pedal Position (APP) Sensor
Object Number: 397650 Size: LF
(1)Accelerator Pedal Position (APP) Sensor
Figure 3:

Instrument Panel
Object Number: 1699704 Size: LF
(1)Trailer Park Brake Control (JE4)
(2)Park Brake Control (JE4)
(3)Gage Center
(4)Inflatable Restraint I/P Module (AK5)
(5)Auxiliary Power Outlets
(6)Air Brake Pressure Gage (JE4)
(7)Transfer Case Shift Control Switch (NP1)
(8)Traction Control Switch (NW9)
(9)Outside Heated Mirror Switch (DB6/DB8)
(10)Exhaust Brake Switch (K40)
(11)Rear Axle Driver Control Switch - Two Speed (HPZ/Automatic Transmission)
(12)Inflatable Restraint I/P Module Disable Switch (AK5 w/o AQR)
(13)Differential Lock Switch (HNB/HPL/HPN) or Inter-Axle Differential Lock Switch (Tandem Axle)
(14)Switch
(15)Air Suspension Dump Switch (G40/G45/GSJ)
(16)Diesel Particulate Filter (DPF) (Diesel Only)
(17)Marker Lamp Switch (RQ2 and U86 or RQ3)
(18)High Idle Switch (UF3)/Power Take-Off (PTO) Switch
(19)Air Cleaner Restriction Gage (UPM)
(20)Automatic Transmission Fluid Temperature (TFT) Gage (Allison® LCT/UXT)
(21)I/P Switchbank
(22)HVAC Control Assembly (C40/C60)
(23)Driver Information Center (DIC)
(24)Radio (w/o UL5)
(25)Inflatable Restraint Steering Wheel Module (AJ3/AK5)
(26)Headlamp Switch
(27)Turn Signal/Multifunction Switch
(28)Instrument Panel Cluster (IPC)
Figure 4:

Right Side of the Engine (LG4)
Object Number: 228805 Size: LF
(1)Engine Harness
(2)Generator Fuse
(3)Generator
(4)A/C Compressor Clutch (C60)
(5)A/C Compressor (C60)
(6)Engine Oil Pressure (EOP) Sensor
Figure 5:

Top Center of Flywheel Housing
Object Number: 397634 Size: MF
(1)Crankshaft Position (CKP) Sensor (Allison® LCT)
Figure 6:

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


Object Number: 953488 Size: LF
(1)Fuel Sender - Primary
(2)Fuel Tank
(3)Low Air Pressure Switch - Primary
(4)Low Air Pressure Switch - Secondary
(5)Splice Pack SP400 (Ground Block - 6 cavities)
(6)Fuel Sender - Secondary Connector
(7)Ground G400
(8)Fuel Sender - Secondary
(9)Fuel Tank - Secondary
Figure 7:

Fuel Tank Harness, Left Side
Object Number: 628248 Size: LF
(1)Fuel Sending Unit Connector
(2)Fuel Tank Sender
(3)Fuel Transfer Pump Connector
(4)Fuel Transfer Pump
(5)Back of Cab Crossmember
(6)Fuel Tank Harness
(7)C411
(8)Rear Chassis Harness
Figure 8:

Left Rear Engine View
Object Number: 397647 Size: LF
(1)Fuel Injector Connector C123 - to the fuel injector harness connector adapter 2
(2)Glow Plug 5
(3)Fuel Temperature Sensor
(4)Glow Plug 6
Figure 9:

Top of Engine, Front, Under Valve Cover
Object Number: 1507904 Size: LF
(1)Fuel Injector 1
(2)Fuel Injector 2
(3)C122 (8 cavities)
(4)Fuel Injector 3
(5)Glow Plug 3
(6)Glow Plug Bus 2
(7)Fuel Injector Harness Connector Adapter 1 (C122)
(8)Glow Plug 2
(9)Glow Plug Bus 1
(10)Glow Plug 1
Figure 10:

Top of Engine, Rear, Under Valve Cover
Object Number: 1507905 Size: LF
(1)Fuel Injector 4
(2)C123 (8 cavities)
(3)Fuel Injector 5
(4)Fuel Injector 6
(5)Glow Plug 6
(6)Glow Plug Bus 2
(7)Glow Plug 5
(8)Fuel Injector Harness Connector Adapter 2 (C123)
(9)Glow Plug 4
(10)Glow Plug Bus 1
Figure 11:

Top Left Side of Engine, Intake
Object Number: 1715204 Size: MF
(1)Boost Pressure Sensor
(2)Intake Manifold