GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
Buick
🢒
2009
🢒
Regal
🢒
Power and Signal Distribution
🢒 Data Communications
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
Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
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 Mid 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 B101D
DTC B101E
DTC C0550
DTC C056D
DTC C056E
DTC C078A
DTC U0001
DTC U0002
DTC U0020
DTC U0073 or U2100
DTC U0074
DTC U0100-U0299
DTC U0300-U0336
DTC U0400-U05FF
DTC U1500-U15BF
DTC U1814
DTC U18B9-U18BF
DTC U2099
DTC U2101
DTC U2103
DTC U2105-U2199
Electrical/Electronic Schematic Diagrams
Body Control System Schematics
Data Communication Schematics
Removal, Installation, and Replacement
Body Control Module Replacement