GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Impala 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 SIR Schematics
Figure 1:

Power, Ground, DLC, Indicators, Sensors, and References
Object Number: 1888368 Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Deployment Loops
Master Electrical Schematic Icons
BATT 2, HTD/SEAT, AIRBAG, PWR/MIR Fuses, and PWR/SEAT Circuit Breaker
Fuse Block - Underhood Bussing
Passenger Presence System
ECM IGN, TRANS, PWR DROP/CRNK, AIRBAG/DISPLAY, STRTR, FUEL/PUMP, and HORN Fuses
Passenger Presence System
Power, Ground, and Low Speed GMLAN Serial Data
Power, Ground, and Low Speed GMLAN Serial Data
Seat Belt Schematics
G302
Figure 2:

Deployment Loops
Object Number: 1888372 Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Passenger Presence System
Power, Ground, DLC, Indicators, Sensors, and References
Master Electrical Schematic Icons
Figure 3:

Passenger Presence System
Object Number: 1888376 Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Deployment Loops
Master Electrical Schematic Icons
Power, Ground, DLC, Indicators, Sensors, and References
Power, Ground, DLC, Indicators, Sensors, and References
Power, Ground, and Low Speed GMLAN Serial Data
Power, Ground, and Low Speed GMLAN Serial Data
Seat Belt Schematics
G302
G201