Table of Contents 2-1
Section 2
Body Systems
Air Compressor - Auxiliary. . . . . . . . . . . . . . . . . . . . 2-3
Schematic and Routing Diagrams . . . . . . . . . . . . . . .
2-3
Auxiliary Air Compressor Schematics . . . . . . . . . . . .
2-4
Fixed and Moveable Windows . . . . . . . . . . . . . . . . 2-5
Moveable Window Schematics . . . . . . . . . . . . . . . . . .
2-6
Defogger Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9
Description and Operation . . . . . . . . . . . . . . . . . . . . . .
2-10
Power Windows Description and Operation . . . .
2-10
Rear Window Defogger Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11
Horns and Pedestrian Alerts . . . . . . . . . . . . . . . . 2-13
Schematic and Routing Diagrams . . . . . . . . . . . . . .
2-13
Horn Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-14
Description and Operation . . . . . . . . . . . . . . . . . . . . . .
2-15
Horns System Descriptio n and Operation . . . . . .
2-15
Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Schematic and Routing Diagrams . . . . . . . . . . . . . .
2-16
Headlights/Daytime Running Lights (DRL)
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-17
Fog Lights Schematics . . . . . . . . . . . . . . . . . . . . . . . . .
2-19
Exterior Lights Schematics . . . . . . . . . . . . . . . . . . . . .
2-20
Interior Lights Schemati cs . . . . . . . . . . . . . . . . . . . . . .
2-28
Interior Lights Dimmin g Schemati cs . . . . . . . . . . . .
2-32
Description and Operation . . . . . . . . . . . . . . . . . . . . . .
2-37
Exterior Lighting Systems Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-37
Interior Lighting Systems Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-39
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
Schematic and Routing Diagrams . . . . . . . . . . . . . .
2-41
Inside Rearview Mirror Schematics . . . . . . . . . . . . .
2-42
Outside Rearview Mirror Schematics . . . . . . . . . . .
2-43
Description and Operation . . . . . . . . . . . . . . . . . . . . . .
2-45
Automatic Day-Night Mirror Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-45
Outside Mirror Descript ion and Operation . . . . . .
2-45
Trailering Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47
Schematic and Routing Diagrams . . . . . . . . . . . . . .
2-47
Trailering Systems Schematics . . . . . . . . . . . . . . . . .
2-48
Description and Operation . . . . . . . . . . . . . . . . . . . . . .
2-51
Trailering Description and Operation . . . . . . . . . . .
2-51
Vehicle Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56
Schematic and Routing Diagrams . . . . . . . . . . . . . .
2-56
Door Lock/Indicator Schematics . . . . . . . . . . . . . . . .
2-57
Hood Latch Schematics . . . . . . . . . . . . . . . . . . . . . . . .
2-62
Description and Operation . . . . . . . . . . . . . . . . . . . . . .
2-63
Door Ajar Indicator Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-63
Hood Ajar Indicator Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-63
Power Door Locks Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-63
Wipers and Washers . . . . . . . . . . . . . . . . . . . . . . . . . 2-66
Schematic and Routing Diagrams . . . . . . . . . . . . . .
2-66
Wiper/Washer Schematics . . . . . . . . . . . . . . . . . . . . . .
2-67
Description and Operation . . . . . . . . . . . . . . . . . . . . . .
2-69
Wiper/Washer System Description and
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-69
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual