GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Passenger Compartment/Roof Component Views
Figure 1:

Back Window (C49)
Object Number: 1963823 Size: LF
(1)Rear Window Defogger Connector X2
(2)Center High Mounted Stoplamp (CHMSL)
(3)Rear Window Defogger Connector X1
(4)Rear Window Defogger Grid
(5)Body/Roof Harness
Figure 2:

Center of Roof
Object Number: 1963772 Size: LF
(1)Dome and Reading Lamps
(2)Body Harness
Figure 3:

Rear HVAC Controls (C36)
Object Number: 1964146 Size: LF
(1)Blower Motor - Auxiliary
(2)Blower Motor Resistor - Auxiliary
(3)Coolant Bypass Valve Solenoid
Figure 4:

Under the Driver Seat
Object Number: 1964073 Size: LF
(1)Inflatable Restraint Sensing and Diagnostic Module (SDM) (AJ3/AK5)
(2)X203 (16 cavities - I/P Harness to the Body/Roof Harness)
(3)X206 (4 cavities - I/P Harness to the Body/Roof Harness)
(4)Body/Roof Harness
(5)X315 (2 cavities - Console Harness to the Body/Roof Harness)
(6)Body/Roof Harness