GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Forward Lamp Harness (Gas -LY6)


Object Number: 1846449  Size: LF
(1)G101
(2)Left Front Fender
(3)Left Front Headlamp
(4)G100
(5)Radiator
(6)X106
(7)J101
(8)J100
(9)X103
(10)X100
(11)Fuse Block - Underhood X1
Figure 2:

Forward Lamp Harness (Diesel/LY6)


Object Number: 1922972  Size: LF
(1)J101
(2)X106
(3)X103
(4)J100
(5)X100
(6)G100
(7)G101
Figure 3:

Camshaft Position Sensor Jumper Harness 4.8L/5.2L/6.0L/6.2L


Object Number: 1922077  Size: LF
(1)X112
(2)Camshaft Position Sensor Jumper Harness
Figure 4:

Top of Engine 4.3L


Object Number: 1846445  Size: LF
(1)Mega Fuse Ring Terminal
(2)X175
(3)J128
(4)J105
(5)J106
(6)J130
(7)Engine Control Module (ECM) X1
(8)Engine Control Module (ECM) X2
(9)G103
(10)X112
(11)Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Connector
Figure 5:

Left Side of Engine 4.3L


Object Number: 1846447  Size: LF
(1)Throttle Body
(2)G107
(3)Transmission
(4)X300
(5)X109
(6)X110 (NQG/NQH/NP2)
(7)Fuse Block - Underhood X2
Figure 6:

Right Side of Engine (4.3L)


Object Number: 1887852  Size: LF
(1)Evaporative Emission (EVAP) Canister Purge Solenoid Valve
(2)Throttle Body
(3)Mass Air Flow (MAF) / Intake Air Temperature (IAT) Sensor
(4)X112
(5)G103
(6)Crankshaft Position (CKP) Sensor
(7)Knock Sensor (KS) - 2
(8)Starter
(9)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
(10)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2
(11)Vehicle Speed Sensor (VSS)
Figure 7:

Left Front of Engine 4.8L, 5.3L, 6.0L, and 6.2L


Object Number: 1846441  Size: LF
(1)Air Intake Duct
(2)X111
(3)Fuse Block - Underhood X2
(4)X109
(5)X110 (NQF/NQG/NQH/NP2)
(6)Engine Control Module (ECM) X2
(7)Engine Control Module (ECM) X1
(8)G102
(9)J105
Figure 8:

Right Front of Engine 4.8L, 5.3L, 6.0L, and 6.2L


Object Number: 1846440  Size: LF
(1)Dash Panel
(2)X113
(3)J106
(4)G103
Figure 9:

Near the Transmission 4.8L, 5.3L, 6.0L, and 6.2L


Object Number: 1846443  Size: LF
(1)Dash Panel
(2)Transmission
(3)X175
(4)Transfer Case Shift Control Switch (NQG/NP2)
Figure 10:

Heated Oxygen Sensor (HO2S) Jumper Harness (31 Series +6.0L)


Object Number: 1934388  Size: LF
(1)X125
(2)Heated Oxygen Sensor (H02S) Bank 2 Sensor 2
Figure 11:

Engine Harness Jumper to Engine POA Harness Diesel


Object Number: 1870628  Size: LF
(1)Battery - Right
(2)Fuse Holder - Underhood
(3)X127
(4)X108
(5)X107
(6)X123 (PTO)
(7)Fuse Block - Underhood
(8)X109
(9)Battery - Left (6A6/TP2)
(10)Engine Control Module (ECM)
(11)Transmission Control Module (TCM)
Figure 12:

Engine Harness Jumper-Splices Diesel


Object Number: 1870623  Size: LF
(1)J104
(2)J105
(3)J106
(4)J132
(5)J133 (PTO)
(6)X110 (NQF/NQG/NP2)
Figure 13:

Top of Engine Diesel


Object Number: 1870624  Size: LF
(1)Turbocharger Vane Position Control Solenoid Valve
(2)Glow Plug Control Module (GPCM)
(3)Fuel Rail Temperature (FRT) Sensor
(4)Intake Air Temperature (IAT) Sensor 2 Connector
(5)X128
(6)A/C Refrigerant Pressure Sensor (C67/CJ2)
(7)Generator - Left (K76)
(8)A/C Compressor Clutch (C67/CJ2)
(9)Engine Coolant Temperature (ECT) Sensor 1
(10)Engine Coolant Temperature (ECT) Sensor 2
(11)Camshaft Position (CMP) Sensor
(12)X127
(13)Generator - Right
(14)Manifold Absolute Pressure (MAP) Sensor
(15)Intake Air Heater (IAH) Module
(16)Intake Air Temperature (IAT) Sensor 2
(17)Fuel Heater
(18)A/C Low Pressure Switch (C67/CJ2)
Figure 14:

Front Frame Rail Diesel


Object Number: 1870627  Size: LF
(1)X300
(2)G300
(3)Automatic Transmission Turbine Speed Sensor
(4)Automatic Transmission Input Shaft Speed (AT ISS) Sensor
(5)Automatic Transmission
(6)Vehicle Speed Sensor (VSS)
(7)X124 (PTO)
(8)Power Take Off (PTO) Module
(9)X175
Figure 15:

Auxiliary Battery Harness (TP2)


Object Number: 1934393  Size: LF
(1)Fuse Holder - Underhood
(2)Run Relay
(3)Auxiliary Battery Harness
(4)Auxiliary Battery Relay
(5)X122
Figure 16:

Steering Column Harness


Object Number: 1933010  Size: LF
(1)X201
(2)X276 (KA9)
(3)Heated Steering Fuse (KA9)
(4)X277 (KA9)
(5)X275
Figure 17:

I/P Harness - Engine Compartment


Object Number: 1846432  Size: LF
(1)G110
(2)J113 (NQH)
(3)Fuse Block - Underhood X5
(4)Fuse Block - Underhood X4
(5)Left Front Fender
(6)X103
(7)X109
(8)X115 (JL4) or X126 (-JL4)
Figure 18:

I/P Extension Harness -Y91


Object Number: 1846434  Size: LF
(1)JX223 (U2K/UK6/UE1)
(2)X203 (UE1/U3U/UVB)
(3)X204 (U42)
(4)X212
(5)X206 (U42)
(6)X213 (COAX)
(7)Vehicle Communication Interface Module (VCIM)
(8)X211
(9)Floor Panel
Figure 19:

I/P Harness - Passenger Compartment


Object Number: 1846429  Size: LF
(1)J201 (-AN3)
(2)JX221
(3)J200
(4)G201
(5)X201
(6)X205
(7)J203 (Y91)
(8)J206
(9)Junction Block - Right I/P
(10)X200
(11)Floor Panel
(12)X202
(13)J207
Figure 20:

Fuse Block Jumper Harness (9L4)


Object Number: 1890152  Size: LF
(1)Fuse Block - Mobile Radio
(2)I/P Structure - Right Side
(3)J224
(4)J219
(5)J209
(6)X219
(7)X214
(8)J210
(9)J211
(10)Mobile Radio Blunt Cuts
(11)X226
(12)Instrument Panel
Figure 21:

Overhead Console Harness


Object Number: 1890108  Size: LF
(1)X304
(2)Inflatable Restraint Passenger Air Bag ON/OFF Indicator (AL0/C99)
(3)Cellular Microphone (UE1/U3U/UVB)
(4)Roof Beacon Switch (TRW)
(5)Sliding Rear Window Switch (A48)
(6)Courtesy/Reading Lamps-Front
(7)J322
(8)J323
(9)X313 (CF5/TRW/5X7/5Y0)
(10)Roof Mounted Beacon Blunt Cuts (TRW)
(11)Roof Beacon Relay (TRW)
Figure 22:

Console Harness (Y91/D07/UQA)


Object Number: 1846450  Size: LF
(1)X319 (D07 +UQ3)
(2)X211
(3)Console Bracket
Figure 23:

Body Harness Regular Cab


Object Number: 1846438  Size: LF
(1)X200
(2)G302
(3)X319 (D07 +UQ3/AZ3)
(4)JX339
(5)X305
(6)G304
(7)J304
(8)J303
(9)X303
(10)Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(11)X275
(12)X202
(13)X500 (YE9 -AN3/DL3)
(14)X501 (YE9 -AN3/DL3)
(15)X601 (ASF)
(16)X600 (YE9 -AN3/DL3)
Figure 24:

Body Harness Extended Cab


Object Number: 1846437  Size: LF
(1)X700
(2)G303
(3)X303
(4)Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(5)X501 (YE9 -AN3/DL3)
(6)X275
(7)X321 (A48)
(8)X202
(9)X500 (YE9 -AN3/DL3)
(10)G301
(11)J304
(12)X200
(13)X601 (ASF)
(14)X600 (YE9 -AN3/DL3)
(15)G302
(16)JX339
(17)X305
(18)X319 (D07 +UQ3/AZ3)
(19)X800
(20)J302
(21)G304
(22)X320 (A48)
(23)J303
(24)X322 (UD7)
(25)Floor Panel
Figure 25:

Body Harness Crew Cab


Object Number: 1846436  Size: LF
(1)X601 (ASF)
(2)X309 (Y91)
(3)G302
(4)J302
(5)JX339
(6)G301
(7)J304
(8)X305
(9)X800
(10)G304
(11)G307
(12)X320 (A48)
(13)J303
(14)G303
(15)X700
(16)X303
(17)Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(18)X501 (YE9 -AN3/DL3)
(19)X502 (ASF -YE9/+AN3)
(20)J301 (-AN3/DL3)
(21)X202
(22)X500 (YE9 -AN3/DL3)
(23)X321 (A48)
(24)X600 (YE9 -AN3/DL3)
Figure 26:

Driver Seat


Object Number: 1913810  Size: LF
(1)Seat Recline Motor - Driver (AN3)
(2)Seat Lumbar Vertical Motor Position Sensor - Driver (AN3)
(3)Seat Lumbar Vertical Motor - Driver (AN3)
(4)X324 (AN3)
(5)Seat Lumbar Horizontal Motor - Driver (AN3)
(6)Seat Lumbar Horizontal Motor Position Sensor - Driver (AN3)
(7)Seat Recline Position Sensor - Driver (AN3)
(8)Seat Lumbar Switch - Driver (AN3)
(9)Seat Adjuster Switch - Driver (AG1)
(10)Memory Seat Module (AN3)
(11)Inflatable Restraint Seat Position Sensor (SPS) - Left (10 Series)
(12)Seat Adjuster Assembly - Driver (AG1)
(13)Seat Belt Buckle - Driver
Figure 27:

Passenger Seat


Object Number: 1913813  Size: LF
(1)Seat Frame
(2)X325 (AN3)
(3)Seat Lumbar Vertical Motor - Passenger (AN3)
(4)Seat Adjuster Switch - Passenger (AG2)
(5)Seat Lumbar Switch - Passenger (AN3)
(6)Seat Belt Buckle - Passenger
(7)Inflatable Restraint Passenger Presence System (PPS) Module (AL0)
(8)Seat Adjuster Assembly - Passenger (AG2)
(9)Inflatable Restraint Passenger Presence System (PPS) Sensor (AL0)
(10)Seat Recline Motor - Passenger (AN3)
(11)Seat Lumbar Horizontal Motor - Passenger (AN3)
Figure 28:

Brake Clutch Harness


Object Number: 1846991  Size: LF
(1)Driver Door Frame
(2)X205
(3)X220 (JL1)
(4)Accelerator Pedal Position (APP) sensor Connector
(5)Junction Block - Left I/P
Figure 29:

Headliner Harness Regular Cab


Object Number: 1846992  Size: LF
(1)X304
(2)X318
(3)J327
(4)J328
(5)X203 (UE1)
Figure 30:

Headliner Harness Extended Cab


Object Number: 1846993  Size: LF
(1)X304
(2)X318
(3)J327
(4)J328
(5)X203 (UE1/U3U/UVB)
Figure 31:

Headliner Harness Crew Cab


Object Number: 1846994  Size: LF
(1)X304
(2)X318
(3)J327
(4)J328
(5)X321 (A48)
(6)X203 (UE1/U3U/UVB)
(7)X204 (U42)
(8)I/P Trim
Figure 32:

Driver Door


Object Number: 1846999  Size: LF
(1)Door Frame
(2)Fuse Block - I/P X4
(3)J502
(4)X500 (YE9 -AN3/DL3)
(5)X502 (ASF -YE9/+AN3)
Figure 33:

Passenger Door


Object Number: 1847000  Size: LF
(1)J604 (YE9 -AN3/DL3)
(2)Junction Block - Right I/P X3
(3)Door Frame
(4)X601 (ASF)
(5)X600 (YE9 -AN3/DL3)
(6)J603 (YE9 -AN3/DL3)
Figure 34:

Left Rear Door Extended Cab


Object Number: 1846996  Size: LF
(1)X700
(2)Door Frame
Figure 35:

Right Rear Door Extended Cab


Object Number: 1846995  Size: LF
(1)Door Frame
(2)X800
Figure 36:

Left Rear Door Crew Cab


Object Number: 1846998  Size: LF
(1)Door Frame
(2)X700
Figure 37:

Right Rear Door Crew Cab


Object Number: 1846997  Size: LF
(1)X800
(2)Door Handle
(3)Door Frame
Figure 38:

Chassis Harness (LY6/LMM)


Object Number: 1846422  Size: LF
(1)X300
(2)X408 (UD7)
(3)Trailer Tow Connector (UY7)
(4)J411 (JL1)
(5)G401
(6)J331
(7)Fuse Block -- Underhood X3
(8)X126
(9)X220 (JL1)
(10)J300
(11)G300
Figure 39:

Chassis Harness (except LY6/LMM)


Object Number: 1846424  Size: LF
(1)X300
(2)X408 (UD7)
(3)G401
(4)J423 (except LU3/LMG/LC9)
(5)J331
(6)Fuse Block - Underhood X3
(7)X115 (JL4) or X126 (w/o JL4)
(8)X220 (JL1)
(9)J338 (except LU2/LMG)
(10)J300
(11)G300
Figure 40:

Camper/Trailer Harness and Chassis Rear Harness


Object Number: 1890102  Size: LF
(1)X414 (UY2/8S3)
(2)J420 (UY2)
(3)Camper/Trailer Harness
(4)J415 (UY2)
(5)Chassis Harness
(6)J416 (UY2)
(7)J417 (UY2)
(8)J414 (UY2)
(9)J421 (UY2)
(10)J410 (UY2)
(11)Camper / Trailer Harness Blunt Cuts (UY2)
(12)G401 (except LY6/LMM)
(13)Trailer Connector (UY7)
Figure 41:

Sliding Rear Window Jumper Harness (A48)


Object Number: 1847001  Size: LF
(1)X320
(2)Rear Window
(3)J336
(4)J335
Figure 42:

Rear Bumper Harness


Object Number: 1846452  Size: LF
(1)Rear Bumper
(2)J403 (UD7)
(3)J404 (UD7)
(4)Junction Block - Rear Connector
(5)X408 (UD7)
Figure 43:

Hip Lamp Harnesses(R05)


Object Number: 1922961  Size: LF
(1)X415
(2)J412
(3)J419
(4)Right Hip Lamp Harness
(5)Left Hip Lamp Harness
(6)J418
(7)J413
(8)X416