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

Forward Lamp Harness Routing


Object Number: 2054322  Size: LF
(1)Fuse Block - Underhood X3 Connector
(2)J112
(3)Marker Lamp - Left Front
(4)X141
(5)X143
(6)G101
(7)Engine Cooling Fan - Left Connector
(8)Engine Cooling Fan - Right Connector
(9)G100
(10)X142
(11)X144
(12)Marker Lamp - Right Front
(13)J124
(14)J123 (LS4)
(15)X120
Figure 2:

Engine Harness Routing (L26)


Object Number: 2054328  Size: LF
(1)Fuse Block - Underhood X1 Connector
(2)X110
(3)J109
(4)X126
(5)J102
(6)Throttle Body Connector
(7)J101
(8)X102
(9)X101
(10)Electronic Brake Control Module (EBCM) Connector
(11)J117 (NU6)
(12)Powertrain Control Module (PCM) X2 Connector
(13)Powertrain Control Module (PCM) X3 Connector
(14)Powertrain Control Module (PCM) X1 Connector
(15)X100
(16)Wheel Speed Sensor (WSS) - Left Front Connector
(17)J114 (NU6)
(18)G113
(19)G115
(20)Wheel Speed Sensor (WSS) - Right Front Connector
(21)X104
Figure 3:

Engine Harness Routing (LS4)


Object Number: 2044947  Size: LF
(1)J108
(2)X112
(3)X111
(4)X101
(5)X102
(6)J125
(7)X100
(8)G112
(9)J101
(10)G113
(11)G115
(12)X107
(13)Fuse Block - Underhood
Figure 4:

I/P Harness Routing - Engine Compartment (L26)


Object Number: 2054497  Size: LF
(1)X120
(2)X104
(3)X108
(4)X101
(5)X102
Figure 5:

I/P HarnessRouting - Engine Compartment (LS4)


Object Number: 2054493  Size: LF
(1)Instrument Panel
(2)X102
(3)X101
(4)X108
(5)X120
(6)Battery
Figure 6:

I/P Harness Routing - Lower Left Side


Object Number: 2054485  Size: LF
(1)X210
(2)G201
(3)G200
(4)G202
(5)Data Link Connector (DLC)
(6)JX205
(7)X201
(8)X208
(9)X209
Figure 7:

Steering Column Harness Routing


Object Number: 1803071  Size: LF
(1)Steering Angle Sensor (JL4)
(2)X201
(3)Automatic Transmission Shift Lock Control Solenoid Connector
(4)Horn Switch Connector
(5)X277
(6)Steering Wheel Control Switch - Left
(7)Turn Signal/Multifunction Switch
(8)Body Control Module (BCM) X3 Connector
Figure 8:

Console Harness Routing


Object Number: 1803082  Size: LF
(1)Accessory Power Outlet - Center Console
(2)X340
Figure 9:

Body Harness Routing - Front of the Passenger Compartment


Object Number: 2069916  Size: LF
(1)X800
(2)X341 (D55)
(3)X340
(4)X312 (AL9)
(5)X700
(6)X316
(7)X208
(8)Body Control Module (BCM) X2 Connector
(9)J303
(10)X500
(11)G301
(12)J350
(13)X311 (AG1)
(14)X313 (AG2)
(15)JX307
(16)G302
(17)X600
(18)Fuse Block - I/P X2 Connector
(19)X200
(20)X278
(21)Body Harness
(22)Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(23)X315
(24)J406
Figure 10:

Body Harness Routing - Rear of the Passenger Compartment


Object Number: 2069965  Size: LF
(1)X402
(2)X450 (UD7)
(3)J360
(4)J361
(5)Rear Object Sensor Control Module Connector (UD7)
(6)X401
(7)X406
(8)Evaporative Emission (EVAP) Canister Vent Solenoid Valve Connector
(9)Rear Floor Pan
(10)X405
(11)X400
Figure 11:

Headliner Harness Routing (CF5)


Object Number: 1803068  Size: LF
(1)X390
(2)Courtesy/Reading Lamps - Left Rear Connector
(3)Headliner
(4)Sunshade - Left Connector
(5)Inside Rearview Mirror (ISRVM) Connector
(6)X399
(7)Sunshade - Right Connector
(8)X398
(9)J394
(10)J393
(11)J398
Figure 12:

Driver Door and Left Front Door Trim Harness Routing


Object Number: 1803037  Size: LF
(1)Door Frame
(2)Door Trim Panel
(3)Door Lock - Driver Connector
(4)J500
(5)J501
(6)X501
(7)X502
(8)J500
Figure 13:

Passenger Door and Right Front Door Trim Harness Routing


Object Number: 1803062  Size: LF
(1)Door Trim Panel
(2)Door Frame
(3)J604
(4)X600
(5)X601
(6)J605
(7)Door Lock - Passenger Connector
Figure 14:

Driver Seat Harness Routing


Object Number: 1803076  Size: LF
(1)Seat Belt Pretensioner - Driver Connector
(2)Seat Lumbar Motor - Driver (AL9)
(3)J330
(4)Seat Lumbar Switch - Driver (AL9)
(5)Seat Adjuster Switch - Driver
(6)J331 (AL9)
(7)Heated Seat Relay - Driver (KA1)
(8)X311 (AG1)
(9)X316
(10)Seat Adjuster Motor Assembly - Driver Connector
Figure 15:

Passenger Seat Harness Routing


Object Number: 1803086  Size: LF
(1)X313 (AG2)
(2)Inflatable Restraint Passenger Presence System (PPS) Module
(3)J333
(4)X315
Figure 16:

Left Rear Door Harness Routing


Object Number: 1456707  Size: LF
(1)Window Switch - Left Rear Connector
(2)Door Frame
(3)Door Lock - Left Rear Connector
(4)Door Trim Panel
(5)Window Motor - Left Rear Connector
(6)X700
Figure 17:

Right Rear Door Harness Routing


Object Number: 1803130  Size: LF
(1)Door Frame
(2)Window Switch - Right Rear Connector
(3)X800
(4)Window Motor - Right Rear Connector
(5)Door Trim Panel
(6)Door Lock - Right Rear Connector
Figure 18:

Rear Parking Assist and License Lamp Harness Routing


Object Number: 1803064  Size: MF
(1)Rear Fascia
(2)X450 (UD7)
(3)J450
(4)J451
(5)J401
(6)J402
(7)X406