GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 LaCrosse 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Ground Views
Figure 1:

Forward Lamp Harness
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 (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 (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 - 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 5:

Body Harness - 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