GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra - 4WD 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Harness Routing Views
Figure 1:

Forward Lamp harness routing (Gas except LY6) - 1 of 2
Object Number: 2159782 Size: LF
(1)X100
(2)X103
(3)X120 (HP2)
(4)X106
Figure 2:

Forward Lamp harness routing (Gas except LY6) - 2 of 2
Object Number: 2159641 Size: LF
(1)J117 (HP2)
(2)J101
(3)J118 (HP2)
(4)J119 (HP2)
(5)J100
(6)J115 (HP2)
(7)J114 (HP2)
Figure 3:

Forward Lamp Harness Routing (Diesel/LY6)
Object Number: 1922972 Size: LF
(1)J101
(2)X106
(3)X103
(4)J100
(5)X100
(6)G100
(7)G101
Figure 4:

Engine Harness Routing - Left Side (4.3L)
Object Number: 1846447 Size: LF
(1)Throttle Body
(2)G107
(3)Transmission
(4)X300
(5)X109
(6)X110 (NQG/NQH)
(7)Fuse Block - Underhood X2
Figure 5:

Engine Harness Routing - Top (4.3L)
Object Number: 1846445 Size: LF
(1)Mega Fuse Ring Terminal
(2)X175 (M30)
(3)J128
(4)J105
(5)J106
(6)J130 (M30 with NQG/NQH)
(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 6:

Camshaft Position Sensor Jumper Harness Routing (4.8L/5.3L/6.0L/6.2L)
Object Number: 1922077 Size: LF
(1)X112
(2)Camshaft Position Sensor Jumper Harness
Figure 7:

Engine Harness Routing - Left Front Side (4.8L/5.3L/6.0L/6.2L except LFA/HP2)
Object Number: 1846441 Size: LF
(1)Air Intake Duct
(2)X111
(3)Fuse Block - Underhood X2
(4)X109
(5)X110 (NQF/NQG/NQH)
(6)Engine Control Module (ECM) X2
(7)Engine Control Module (ECM) X1
(8)G102
(9)J105
Figure 8:

Engine Harness Routing - Right Front Side (4.8L/5.3L/6.0L/6.2L except LFA/HP2)
Object Number: 1846440 Size: LF
(1)Dash Panel
(2)X113
(3)J106
(4)G103
Figure 9:

Engine Harness Routing - Rear (4.8L/5.3L/6.0L/6.2L except LFA/HP2)
Object Number: 1846443 Size: LF
(1)Dash Panel
(2)Transmission
(3)X175 (M30)
(4)Transfer Case Shift Control Switch (NQG)
Figure 10:

Heated Oxygen Sensor (HO2S) Jumper Harness Routing (LY6)
Object Number: 1934388 Size: LF
(1)X125
(2)Heated Oxygen Sensor (H02S) Bank 2 Sensor 2
Figure 11:

Engine Harness Routing - Front (LFA/HP2) - 1 of 2
Object Number: 2160366 Size: LF
(1)X111
(2)X109
(3)X110 (NQH)
(4)X120
(5)X150
(6)X112
Figure 12:

Engine Harness Routing - Front (LFA/HP2) - 2 of 2
Object Number: 2163311 Size: LF
(1)J105
(2)J121
(3)J120
(4)J123
(5)J130 (NQH)
(6)J124
(7)J106
(8)J104
(9)J122
Figure 13:

Engine Harness Routing - Rear (LFA/HP2)
Object Number: 2160370 Size: LF
(1)X113
(2)X176
(3)Automatic Transmission Connector
(4)X300
Figure 14:

Engine Chassis Harness Routing - Top Front (Diesel)
Object Number: 1870628 Size: LF
(1)Battery - Right
(2)Fuse Holder
(3)X127
(4)X108
(5)X107
(6)X123 (PTO)
(7)Fuse Block - Underhood
(8)X109
(9)Battery - Left
(10)Engine Control Module (ECM)
(11)Transmission Control Module (TCM)
Figure 15:

Engine Chassis Harness Routing - Top Rear (Diesel)
Object Number: 1870623 Size: LF
(1)J104
(2)J105
(3)J106
(4)J132 (K76/YF2)
(5)J133 (PTO)
(6)X110 (NQF/NQG)
Figure 16:

Engine Chassis Harness Routing - Rear (Diesel)
Object Number: 2056669 Size: LF
(1)X300
(2)G300
(3)Automatic Transmission Turbine Speed Sensor (MW7)
(4)Automatic Transmission (MW7)
(5)Vehicle Speed Sensor (VSS) (MW7)
(6)X124 (PTO)
(7)Power Take Off (PTO) Module (PTO)
(8)X175 (MW7)
Figure 17:

Auxiliary Battery Harness Routing (TP2)
Object Number: 1934393 Size: LF
(1)Fuse Holder
(2)Auxiliary Battery Run Relay
(3)Auxiliary Battery Harness
(4)Auxilary Battery Relay
(5)X122
Figure 18:

I/P Harness Routing - Engine Compartment (Except HP2)
Object Number: 1846432 Size: LF
(1)G110 (XA7)
(2)J113 (NQH)
(3)Fuse Block - Underhood X5
(4)Fuse Block - Underhood X4
(5)Left Front Fender
(6)X103
(7)X109
(8)X115
Figure 19:

I/P Harness Routing - Engine Compartment (HP2)
Object Number: 2171756 Size: LF
(1)X115
(2)X129
(3)J113 (NQH)
(4)X109
(5)X103
(6)X150
Figure 20:

I/P Harness Routing - Passenger Compartment (HP2) - 1 of 2
Object Number: 2171977 Size: LF
(1)X201
(2)X205
(3)X200
(4)X215
(5)X212
(6)X202
Figure 21:

I/P Harness Routing - Passenger Compartment (HP2) - 2 of 2
Object Number: 2172590 Size: LF
(1)J201
(2)J206
(3)J203
(4)J225
(5)J240
(6)J226
(7)J231
(8)J200
(9)J222
(10)J241
(11)JX221
(12)J207
Figure 22:

I/P Harness Routing - Passenger Compartment (Except HP2) - 1 of 2
Object Number: 2172747 Size: LF
(1)X201
(2)X205
(3)Junction Block - Right I/P
(4)X200
(5)X202
Figure 23:

I/P Harness Routing - Passenger Compartment (Except HP2) - 2 of 2
Object Number: 2172751 Size: LF
(1)J207 (NQF/NQH except MEX)
(2)J201
(3)JX221
(4)J200
(5)J203 (Y91)
(6)J206 (CJ2)
Figure 24:

I/P Extension Harness Routing (SLT except Y91/MEX)
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) (UE1)
(8)X301 (UQA/D07)
(9)Floor Panel
Figure 25:

I/P Extension Harness Routing (except SLT/Y91/MEX)
Object Number: 2168760 Size: LF
(1)X203 (UE1/U3U/UVB)
(2)X204 (U42)
(3)X206 (U42)
(4)X213 (COAX)
(5)X212
(6)X301 (UQA/D07)
Figure 26:

Fuse Block Jumper Harness Routing (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)Blunt Cut - Mobile Radio Provision
(11)X226
(12)Instrument Panel
Figure 27:

Brake Clutch Harness Routing
Object Number: 1846991 Size: LF
(1)Driver Door Frame
(2)X205
(3)X102 (JL1)
(4)Accelerator Pedal Position (APP) Sensor Connector
(5)Junction Block - Left I/P (except MEX)
Figure 28:

Steering Column Harness Routing
Object Number: 1933010 Size: LF
(1)X201
(2)X276 (KA9)
(3)Heated Steering Fuse (KA9)
(4)X277 (KA9)
(5)X275
Figure 29:

Overhead Console Harness Routing
Object Number: 1890108 Size: LF
(1)X304 (except MEX)
(2)Inflatable Restraint Passenger Air Bag On/Off Indicator (AL0/C99 except MEX)
(3)Cellular Telephone Microphone (UE1/U3U/UVB)
(4)Roof Beacon Switch (5X7/5Y0/TRW)
(5)Sliding Rear Window Switch (A48)
(6)Dome/Reading Lamps - Front
(7)J322 (TRW/UG1/A48)
(8)J323
(9)X313 (CF5/TRW/5X7/5Y0)
(10)Blunt Cut - Roof Mounted Beacon Provision (TRW)
(11)Roof Beacon Relay (TRW)
Figure 30:

Headliner Harness Routing (Regular Cab)
Object Number: 1846992 Size: LF
(1)X304 (except MEX)
(2)X318
(3)J327 (except MEX)
(4)J328
(5)X203 (UE1/U3U/UVB))
Figure 31:

Headliner Harness Routing (Extended Cab)
Object Number: 1846993 Size: LF
(1)X304
(2)X318
(3)J327
(4)J328
(5)X203 (UE1/U3U/UVB)
Figure 32:

Headliner Harness Routing (Crew Cab)
Object Number: 1846994 Size: LF
(1)X304
(2)X318
(3)J327
(4)J328
(5)X208 (A48)
(6)X203 (UE1/U3U/UVB)
(7)X204 (U42)
(8)I/P Trim
Figure 33:

Body Harness Routing (Regular Cab)
Object Number: 1846438 Size: LF
(1)X200
(2)G302
(3)X319 (AZ3/D07 with UQ3)
(4)JX339 (except MEX)
(5)X305 (except MEX)
(6)G304 (except MEX)
(7)J304 (AG2)
(8)J303
(9)X303 (except MEX)
(10)Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(11)X275
(12)X202
(13)X500 (YE9 without AN3/DL3)
(14)X501 (YE9 without AN3/DL3)
(15)X601 (ASF)
(16)X600 (YE9 without AN3/DL3)
Figure 34:

Body Harness Routing (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 without AN3/DL3)
(6)X275
(7)X208 (A48)
(8)X202
(9)X500 (YE9 without AN3/DL3)
(10)G301
(11)J304
(12)X200
(13)X601 (ASF)
(14)X600 (YE9 without AN3/DL3)
(15)G302
(16)JX339
(17)X305
(18)X319 (AZ3/D07 with UQ3)
(19)X800
(20)J302
(21)G304
(22)X320 (A48)
(23)J303
(24)X322 (UD7)
(25)Floor Panel
Figure 35:

Body Harness Routing (Crew Cab except HP2)
Object Number: 2152886 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 without AN3/DL3)
(19)X502 (ASF without YE9 or with AN3)
(20)X202
(21)X500 (YE9 without AN3/DL3)
(22)X208 (A48)
(23)X600 (YE9 without AN3/DL3)
Figure 36:

Body Harness Routing (Crew Cab with HP2) - 1 of 2
Object Number: 2163615 Size: LF
(1)X501 (Except DL3)
(2)X275
(3)X200
(4)X215
(5)X319
(6)X305
(7)X800
(8)X322 (UD7)
(9)X320 (A48)
(10)X350
(11)X303
(12)X700
(13)X601 (ASF)
(14)X600 (Except DL3)
(15)X500 (Except DL3) or X502 (DL3)
(16)X202
(17)X208 (A48)
Figure 37:

Body Harness Routing (Crew Cab with HP2) - 2 of 2
Object Number: 2163892 Size: LF
(1)J303
(2)J302
(3)J304
(4)JX339
Figure 38:

Chassis Harness Routing (Except LY6/LMM/HP2)
Object Number: 1846424 Size: LF
(1)X300
(2)X408 (UD7)
(3)G401
(4)J423 (except LU3)
(5)J331
(6)Fuse Block - Underhood X3
(7)X115
(8)X102 (JL1)
(9)J338 (except LU3/LMG)
(10)J300
(11)G300
Figure 39:

Chassis Harness Routing (HP2) - 1 of 2
Object Number: 2164185 Size: LF
(1)X102 (JL1)
(2)X300
(3)X408 (UD7)
(4)X129
(5)X115
Figure 40:

Chassis Harness Routing (HP2) - 2 of 2
Object Number: 2164195 Size: LF
(1)J331
(2)J411 (JL1)
(3)J423
(4)J422
(5)J338
(6)J301
(7)J321
(8)J325
(9)J300
Figure 41:

Chassis Harness Routing (LY6/LMM except 31 Series)
Object Number: 1846422 Size: LF
(1)X300
(2)X408 (UD7)
(3)Trailer Connector (UY7)
(4)J411 (JL1)
(5)G401
(6)J331
(7)Fuse Block - Underhood X3
(8)X115
(9)X102 (JL1)
(10)J300
(11)G300
Figure 42:

Chassis Harness - Front Engine Compartment (31 Series)
Object Number: 2085721 Size: LF
(1)X102 (JL1)
(2)Fuel Pump Relay - Secondary (LY6 without NQZ)
(3)Fuse Block - Underhood
(4)X126
Figure 43:

Chassis Harness (31 Series)
Object Number: 2085746 Size: LF
(1)Trailer Brake Control Relay (JL1)
(2)J422 (JL1)
(3)Trailer Connector
(4)J331 (Diesel without NQZ/LY6)
(5)X300 (LY6)
(6)X300 (Diesel)
(7)J411 (JL1)
(8)Junction Block-Rear Lamps
(9)G401
(10)J338 (JL1)
(11)G300
(12)J300 (LY6 without NQZ)
Figure 44:

Camper Harness Routing and Chassis Harness Routing - Rear
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)Blunt Cut - Camper Trailer Provision (UY2)
(12)G401 (except LY6/LMM)
(13)Trailer Connector (UY7)
Figure 45:

Driver Door Harness Routing
Object Number: 1846999 Size: LF
(1)Door Frame
(2)Fuse Block - I/P X4
(3)J502 (YE9 without AN3)
(4)X500 (YE9 without AN3/DL3)
(5)X502 (ASF without YE9 or with AN3)
Figure 46:

Passenger Door Harness Routing
Object Number: 1847000 Size: LF
(1)J604 (YE9 without AN3/DL3)
(2)Junction Block - Right I/P X3
(3)Door Frame
(4)X601 (ASF)
(5)X600 (YE9 without AN3/DL3)
(6)J603 (YE9 without AN3/DL3)
Figure 47:

Left Rear Door Harness Routing (Extended Cab)
Object Number: 1846996 Size: LF
(1)X700
(2)Door Frame
Figure 48:

Left Rear Door Harness Routing (Crew Cab)
Object Number: 1846998 Size: LF
(1)Door Frame
(2)X700
Figure 49:

Right Rear Door Harness Routing (Extended Cab)
Object Number: 1846995 Size: LF
(1)Door Frame
(2)X800
Figure 50:

Right Rear Door Harness Routing (Crew Cab)
Object Number: 1846997 Size: LF
(1)X800
(2)Door Handle
(3)Door Frame
Figure 51:

Driver Seat Harness Routing
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 (MSM) (AN3)
(11)Inflatable Restraint Seat Position Sensor (SPS) - Driver (10 Series)
(12)Seat Adjuster Motor Assembly - Driver (AG1)
(13)Seat Belt Buckle - Driver
Figure 52:

Console Harness Routing (Y91/D07/UQA)
Object Number: 1846450 Size: LF
(1)X319 (D07with UQ3)
(2)X301
(3)Console Bracket
Figure 53:

Passenger Seat Harness Routing
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 Motor 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 54:

Sliding Rear Window Jumper Harness Routing (A48)
Object Number: 1847001 Size: LF
(1)X320
(2)Rear Window
(3)J336 (except C49)
(4)J335 (except C49)
Figure 55:

Left and Right Hip Lamp Harness Routing (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
Figure 56:

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