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

G100 and G101


Object Number: 2159569  Size: LF
(1)G101
(2)G100
Figure 2:

Engine Harness - 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 3:

Engine Harness - 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 4:

Engine Harness - Left Front Side (4.8L/5.3L/6.0L/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)
(6)Engine Control Module (ECM) X2
(7)Engine Control Module (ECM) X1
(8)G102
(9)J105
Figure 5:

Engine Harness - Right Front Side (4.8L/5.3L/6.0L/6.2L)


Object Number: 1846440  Size: LF
(1)Dash Panel
(2)X113
(3)J106
(4)G103
Figure 6:

Engine Chassis Harness - 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 7:

G110 (XA7)


Object Number: 2171814  Size: LF
(1)G110
Figure 8:

G201


Object Number: 2172744  Size: LF
(1)G201
Figure 9:

Body Harness (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 10:

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 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 11:

G301, G302, G303, G304 and G307 (Crew Cab)


Object Number: 2163944  Size: LF
(1)G302
(2)G301
(3)G304
(4)G307
(5)G303
Figure 12:

Chassis Harness (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 13:

G300 and G401 (Except LY6/LMM/31 Series)


Object Number: 2164292  Size: LF
(1)G401
(2)G300