1991 Chevrolet C/K Pickup Factory Electrical Diagnosis and Wiring Diagrams Manual

Description

Factory service repair manual for 1991 Chevy C/K Pickup Trucks Phantom V ie w ...................................................................................................................................................... 2 Introduction ...........................................................................................................................................................3 How to Use this M anual............................................................................................................................. 3 Circuit Operation ........................................................................................................................................3 Circuit Diagrams..........................................................................................................................................3 Component Locations................................................................................................................................. 3 Diagnosis .................................................................................................................................................... 4 Basic Electricity ..........................................................................................................................................4 Circuit Malfunctions ................................................................................................................................... 4 Electrical Test Equipment................................... .......................................................................................4 Circuit Wiring Repair Procedures.............................................................................................................. 6 Weather-Pack Connectors .........................................................................................................................8 Metri-Pack Connectors............................................................................................................................... 8 Special Tools ..............................................................................................................................................9 Regular Production Option (RPO) List ............................................................................................................ 10 Abbreviation List ................................................................................................................................................10 Symptoms Index ................................................................................................................................................11 Power Distribution ..............................................................................................................................................13 Fuse Block and Fuse Block Identification........................................................................................................ 15 Bulb D ata.............................................................................................................................................................16 Convenience Center ..........................................................................................................................................17 Auxiliary Battery ................................................................................................................................................18 Ground Distribution ............................................................................................................................................19 Front Exterior Lamps .....................................................................................................................................25 — Headlamps............................................................................................................................................. 25 30 Canadian Daytime Running L am ps.................................................................................................... 25 32 Fog L a m p s............................................................................................................................................. 25 34 Turn Signal L a m p s ................................................................................................................................ 25 36 Hazard Lamps .......................................................................................................................................25 38 Park and Marker Lam ps........................................................................................................................25 40 Roof Marker Lamps .............................................................................................................................. 25 41 H orns.................................................................................................................................................................42 43 Starting and Charging.....................................................................................................................................44 46 Diesel Engine Fuel Controls .......................................................................................................................... 77 78 Glow Plugs ......................................................................................................................................................82 84 Four-Wheel Drive ................................................................................. ......................................................... 88 89 Brake Systems ............................................................................................................................................... 90 91 Instrument Panel ............................................................................................................................................. 94 — G ages......................................................................................................................................................94 100 Indicators ............................................................................................................................................... 94 104 Air Conditioning............................................................................................................................................. 107 112 Auxiliary Cooling F a n .....................................................................................................................................114 115 Heater.............................................................................................................................................................. 116 117 Cruise Control ............................................................................................................................................... 118 119 Interior Lamps and Key-ln Warning Buzzer.............................................................................................. .120 — Courtesy, Dome, and l/P Compartment Lamps ............................ ............................................... 120 122,123 Ashtray Lamp .......................................................................................................................................120 123 Cargo Lamp .........................................................................................................................................120 124 Ignition Key W arning............................................................................................................................ 120 122 Underhood Lamp . .............................................................................................................................. 120 125 Safety Belt Warning Buzzer ........................................................................................................................126 127 Radio .............................................................................................................................................................. 128 130 Power Door L o c k s ................................................................................. ....................................................... 132 133 Power W indow s............................................................................................................................................. 134 136 Rear Defogger............................................................................................................................................... 137 138 Wiper/Washer ............................................................................................................................................... 139 141 Rear Exterior L a m p s.....................................................................................................................................142 — Backup Lamps .....................................................................................................................................142 143 Taillamps............................................................................................................................................... 142 145 Endgate and Fender Clearance Lamps ............................................................................................142 147 License Lamps .....................................................................................................................................142 148 Stoplamps............................................................................................................................................. 142 149 Trailer or Camper W iring........................................................................................................................— 151 Component Locator Views ............................................................................................................................— 152 Component Locator Ind e x.............................................................................................................................. — 182 Index ................................................................................................................................................................ — 189 Ignition System ............................................................................................................................................... — 47 Electronic Control Module — Gasoline Engine ................................................................................. — 49 Powertrain Control M odule....................................................................................................................— 59 Electronic Control Module — Diesel Engine........................................................................................— 68 Transmission Control Module — Diesel Engine ................................................................................. — 72