Power and Signal Distribution

All Description and Operation

• Body Control System Description and Operation
• Data Link Communications Description and Operation

Diagnostic Procedures

• Data Link References
• Diagnostic Starting Point - Data Communications
• Scan Tool Does Not Communicate with High Speed GMLAN Device
• Scan Tool Does Not Communicate with Low Speed GMLAN Device
• Scan Tool Does Not Communicate with Powertrain High Speed GMLAN Device
• Scan Tool Does Not Power Up
• Symptoms - Data Communications

Diagnostic Trouble Codes

• Control Module U Code List
• DTC B1000
• DTC B1001
• DTC B137A
• DTC B137B
• DTC C0550
• DTC C126C, C126D, C12E3, or U180F
• DTC U0020
• DTC U0073 or U2100
• DTC U0074
• DTC U0100-U0299
• DTC U180F
• DTC U1812
• DTC U1813
• DTC U1814
• DTC U1815
• DTC U1816
• DTC U1817
• DTC U1818
• DTC U1820
• DTC U1821
• DTC U182A
• DTC U1842
• DTC U1843
• DTC U1862
• DTC U1866
• DTC U186A
• DTC U186B
• DTC U1875
• DTC U1876
• DTC U1878
• DTC U1879
• DTC U1885
• DTC U1886
• DTC U1888
• DTC U189A
• DTC U2099
• DTC U209A
• DTC U209D
• DTC U2100
• DTC U2103
• DTC U2105-U2199

Electrical/Electronic Schematic Diagrams

• Body Control System Schematics
• Data Communication Schematics

Mechanical Specifications

• Fastener Tightening Specifications

Removal, Installation, and Replacement

• Auxiliary Body Control Module Replacement
• Body Control Module Replacement
• Serial Data Gateway Module Replacement