ElEctrical Manual – 2011 light Duty Full SizE C/K truckS PAGE i Index OVERVIEW Body Control System Description and Operation .............................................................................................................................. A-1 Power Mode Description and Operation ............................................................................................................................................ A-1 Retained Accessory Power Description and Operation .................................................................................................................... A-3 BACKUP ALARM/CAMERA Backup Alarm Relay Schematic ......................................................................................................................................................... A-5 Backup Lamp Schematic ................................................................................................................................................................... A-6 Chassis Harness Routing Diagram .................................................................................................................................................... A-7 Junction Block - Rear Lamps ............................................................................................................................................................. A-8 Junction Block - Rear Lamps X1 ....................................................................................................................................................... A-9 Junction Block - Rear Lamps X2 ..................................................................................................................................................... A-10 BATTERY ISOLATOR Medium Duty Battery Isolator Schematic ........................................................................................................................................ A-11 Auxiliary Battery Schematic .............................................................................................................................................................. A-12 BATTERY/IGNITION GROUND FEEDS Installation of Electrical Aftermarket Accessories-Battery, Ignition and Ground Feeds .................................................................. A-13 ELECTRICAL CHARGING SYSTEM DESCRIPTION AND OPERATION ............................................................................................. A-18 ENGINE IDLE UP Elevated Idle / PTO / High Idle Are All Different Options ................................................................................................................. A-23 Adding PTO Option To A Vehicle Without (PTO) .............................................................................................................................. A-24 IMMOBILIZER ....................................................................................................................................................................................... A-25 LIGHTING Forward Components .............................................................................................................................................................................A-27 Harness Routing .......................................................................................................................................................................A-30 Electrical Manual – 2011 Light Duty Full Size C/K Trucks ElEctrical Manual – 2011 light Duty Full SizE C/K truckS PAGE ii Headlamp Connector Views ..................................................................................................................................................... A-34 Headlamp Replacement ........................................................................................................................................................... A-42 Bulb Replacement .................................................................................................................................................................... A-45 Rearward Separate Stop/Turn .................................................................................................................................................................. A-48 CHMSL ..................................................................................................................................................................................... A-51 Dome Lamp ..................................................................................................................................................................................... A-52 Snow Plow (VYU) .............................................................................................................................................................................. A-53 Roof Beacon (TRW) .......................................................................................................................................................................... A-56 PARK NEUTRAL ...................................................................................................................................................................................... A-61 REMOTE START/STOP ........................................................................................................................................................................... A-63 TRAILER BRAKE Description and Operation ............................................................................................................................................................... A-64 Trailer Brake Control Schematics ..................................................................................................................................................... A-68 Trailer Connector Schematics .......................................................................................................................................................... A-69 Rear Frame and Underbody Components ....................................................................................................................................... A-71 Aftermarket Procedure...................................................................................................................................................................... A-79 Electrical Manual – 2011 Light Duty Full Size C/K Trucks ElEctrical Manual – 2011 light Duty Full SizE C/K truckS PAGE iii FUSE BLOCK DETAIL Fuse Block - Underhood Label ..........................................................................................................................................................B-1 Fuse Block - Underhood Top View - Diesel .....................................................................................................................................B-11 Fuse Block - Underhood Top View - Gas ........................................................................................................................................B-12 Fuse Block - Underhood Bottom View ............................................................................................................................................B-13 Fuse Block - Underhood X1 .............................................................................................................................................................B-14 Fuse Block - Underhood X2 .............................................................................................................................................................B-16 Fuse Block - Underhood X3 .............................................................................................................................................................B-19 Fuse Block - Underhood X4 .............................................................................................................................................................B-21 Fuse Block - Underhood X5 .............................................................................................................................................................B-23 Fuse Block - Underhood X6 .............................................................................................................................................................B-25 Fuse Block - Underhood X7 (except TP2) .......................................................................................................................................B-25 Fuse Block - Underhood X7 (TP2) ...................................................................................................................................................B-25 Fuse Block - Underhood X8 (except JL1) ........................................................................................................................................B-25 Fuse Block - Underhood X8 (JL1) ....................................................................................................................................................B-25 Fuse Block - I/P Label ......................................................................................................................................................................B-26 Fuse Block - I/P Top View ................................................................................................................................................................B-28 Fuse Block - I/P Bottom View ..........................................................................................................................................................B-29