GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 LaCrosse 🢒 Engine 🢒 Engine Electrical 🢒 Harness Routing Views
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:

Off-engine Harness Routing (LY7)
Object Number: 1803135 Size: LF
(1)X107
(2)J121
(3)J120
(4)J110
(5)J119
(6)X109
(7)J103
(8)J131
(9)J133
(10)G115
(11)Engine Coolant Temperature (ECT) Sensor Connector
(12)Starter Solenoid
(13)Starter Motor
(14)Engine Oil Pressure (EOP) Sensor
Figure 5:

On-engine Harness Routing (LY7)
Object Number: 1803136 Size: LF
(1)Cylinder Block
(2)Throttle Body Connector
(3)J108
(4)Engine Control Module (ECM) X1 Connector
(5)X107
(6)G131
(7)J132
(8)J130
(9)G130
Figure 6:

I/P Harness Routing - Engine Compartment (L26 or LY7)
Object Number: 2054497 Size: LF
(1)X120
(2)X104
(3)X108
(4)X101
(5)X102
Figure 7:

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 8:

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 9:

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 10:

Console Harness Routing
Object Number: 1803082 Size: LF
(1)Accessory Power Outlet - Center Console
(2)X340
Figure 11:

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 12:

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 13:

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 14:

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 15:

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 16:

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 17:

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 18:

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 19:

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 20:

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