GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Express 🢒 Body and Accessories 🢒 Data Link Communications 🢒 SIR Schematics
Figure 1:

Module Power, Ground, Serial Data, Indicator and Disable Switch
Object Number: 851814 Size: FS
Master Electrical Component List
SIR System Description and Operation
Inflatable Restraint I/P Module
SIR Caution for Zoning
IGN B Fuse
Data Link Schematics
FRLR PRK, RR PRK, TRLR PRK, and UPFTR PRK Fuses
Controls and Backlighting - 1 of 3
Seat Belt Schematics
Figure 2:

Air Bag Modules and Position Sensors
Object Number: 851815 Size: FS
Master Electrical Component List
SIR System Description and Operation
Inflatable Restraint Steering Wheel Module
SIR Caution for Zoning
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons
SIR Schematic Icons