SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 531 (WIRING SYSTEMS (DIAGNOSTIC INFORMATION AND PROCEDURES))SCHEMATIC AND ROUTING DIAGRAMSHARNESS ROUTING VIEWS
1999 GMC Forward Control 5.7 R, Automatic

Harness Routing Views

1999 GMC Forward Control 5.7 R, AutomaticSECTION Harness Routing Views
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Forward Lamp Harness Routing View - Pontiac
GM861234Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuse Block - Underhood C2
2 C153
3 G101
4 C151
5 C152
6 C154
Fig 2: Forward Lamp Harness Routing View - Buick
GM1614141Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 C155
2 G101
3 S124
4 C105
5 S123
6 C156
7 G100
8 Fuse Block - Underhood, Connector C2
9 C121
10 Front Fascia
Fig 3: Left Side of Engine Compartment (LA1) Harness Routing View
GM1400905Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 G111
2 G117
3 C111
4 Electronic Brake Control Module (EBCM) Connector
5 A/C Refrigerant Pressure Sensor Connector
Fig 4: Engine Compartment Harness Routing View - LF
GM861235Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuse Block - Underhood
2 I/P Harness
3 C101
4 C103
5 C155 (Buick)
6 Engine Harness
7 Forward Lamp Harness
Fig 5: Forward Engine Harness Routing View - Front (LY7)
GM1593664Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 S126
2 Engine Control Module, Connector C1
3 C108
4 C106
5 S119
6 S133
7 S131
8 G131
9 Starter
10 Front Engine Cover
11 S103
Fig 6: Forward Engine Harness Routing View - Rear (LY7)
GM1593667Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Intake Manifold
2 S121
3 G134
4 S120
5 S118
6 C108
7 S128
8 S126
9 S103
10 G132
11 S112
12 S130
13 G130
14 S132
Fig 7: I/P Harness Routing View - Engine Compartment
GM1593669Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuse Block - Underhood, Connector C3
2 Dash Panel
3 C101
4 C103
5 S188 (Late Production)
6 C121
7 Fuse Block - Underhood, Connector C4
Fig 8: I/P Harness Routing View - Passenger Compartment
GM1593671Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 G202
2 S211
3 S209
4 S203
5 S243
6 S242
7 Splice Pack SP215
8 S204
9 S205
10 S213
11 S200
12 G200
13 G201
14 C200
15 Fuse Block - Center Console, Connector C1
16 C206
17 S222 (Late Production)
18 S221 (Late Production)
19 S220 (Late Production)
20 S202
21 C201
22 S201
23 Splice Pack SP206
24 C203
25 Splice Pack SP205
26 G202
Fig 9: Splice Packs 205, 206, 215, 250, 315 and 409 Harness Routing View
GM1515376Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 SP 315
2 SP 205
3 SP 206
4 SP 215 (U32)
5 SP 250
6 SP 409
Fig 10: Body Harness Routing View
GM861244Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Ground G401
2 C351
3 Ground G301
4 C313, C317 (A43)
5 C301 & C303
6 C203
7 C200
8 C302
9 C316 (KA1)
10 C352
11 Ground G302
12 Inflatable Restraint Sensing and Diagnostic Module (SDM)
13 C314
14 C315 (KA1)
15 C305
16 Ground G402
17 C309
18 C420
Fig 11: Door Harness Routing View - Driver
GM761607Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Door Latch - Driver
2 Door Latch - C1 (Ajar Switch) - Driver
3 Door Lock Switch - Driver and Window Master Switch
4 Outside Rear View Mirror - Driver (Passenger Similar)
5 Window Motor - Driver
6 C301
7 Outside Rearview Mirror Switch
Fig 12: Passenger Compartment Harness Routing View - LF
GM861247Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 C351
2 Ground G301
3 C301
4 C203
5 Body Harness
6 C305
Fig 13: Passenger Compartment Harness Routing View - RF
GM861253Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 C200
2 C302
3 Ground G302
4 C352
5 Body Harness
Fig 14: Door Harness Routing View - Front Passenger
GM761608Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Door Lock and Window Switch - Front Passenger
2 Door Latch - Front Passenger
3 C302
4 Window Motor - Front Passenger
Fig 15: Door Harness Routing View - LR
GM861256Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Door Latch - LR
2 Window Motor - LR
3 C351
4 Window Switch - LR
Fig 16: Door Harness Routing View - RR
GM761606Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Window Motor - RR
2 Door Latch - RR
3 Window Switch - RR
4 C352
Fig 17: Passenger Compartment Harness Routing View - LR
GM861258Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Ground G401
2 Body Harness
3 C308 (Pontiac) C310 (Buick)
4 C405
5 C305
6 C403 (Pontiac)
7 C420
8 Splice Pack 409
9 C407
Fig 18: Passenger Compartment Harness Routing View - RR Buick
GM861273Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 C413
2 Ground G402
3 Body Harness
Fig 19: Endgate Harness Routing View - Pontiac
GM861277Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 C403
2 Endgate Harness
3 Endgate Latch - Right C1
4 Endgate Latch- Right C2
5 Lift Window Release Actuator - Right C1
6 Lift Window Release Actuator - Right C2
7 Lock Cylinder Switch - Endgate
8 Lift Window Release Actuator - Left C2
9 Lift Window Release Actuator - Left C1
10 Endgate Latch - Left C2
11 Endgate Latch - Left C1
Fig 20: Rear Parking Assist (RPA) Harness Routing View
GM819386Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Rear Parking Assist (RPA) Display
2 Rear Parking Assist (RPA) Display Housing
3 Connector C411
4 Object Sensor - RR Corner
5 Object Sensor - RR Middle
6 Object Sensor - LR Middle
7 Object Sensor - LR Corner
8 Rear Parking Assist (RPA) Module
9 Rear Wiper/Washer, Liftgate Release and Rear Parking Assist (RPA) Switch Assembly
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.