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

BCM Ground, Power, Serial Data
Object Number: 2078716 Size: FS
Figure 2:

BCM References - Audible Warnings, Defogger, Door Lock/Indicator, Exterior Lights, SIR, Transmission
Object Number: 2078719 Size: FS
Figure 3:

BCM References - Immobilizer, Release Systems, Theft Deterrent, Windows, Wiper/Washer
Object Number: 2078721 Size: FS
Figure 4:

MCM Ground, Power, Shiftlock References
Object Number: 2078723 Size: FS
Figure 5:

MCM - Lighting System References
Object Number: 2078725 Size: FS
Figure 6:

MCM - Mirror System References
Object Number: 2078727 Size: FS
Figure 7:

Power, Ground, Class 2
Object Number: 2078729 Size: FS
Figure 8:

High Speed GMLAN - M98 (LHD)
Object Number: 2078735 Size: FS
Figure 9:

High Speed GMLAN - M98 (RHD)
Object Number: 2078738 Size: FS
Figure 10:

High Speed GMLAN - MFB/MFN
Object Number: 2078741 Size: FS
Figure 11:

High Speed GMLAN - MH7/MH8
Object Number: 2078743 Size: FS