GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
Chevrolet
🢒
2003
🢒
Express
🢒 Power, Ground, MIL, and DLC
Power, Ground, MIL, and DLC
Power, Ground, MIL and DLC
Master Electrical Component List
Powertrain Control Module Description
5 Volt Reference (4.8L, 5.3L, and 6.0L)
OBD II Symbol Description Notice
B+ Bus - Underhood Fuse Block
IGN B Fuse
O2A, O2B, SPARE, BTSI BU, PCM IGN 1, BTSI, and TRLR BU Fuses
CRANK, IGN O, TBC ACC, FR WPR, BRKS, and HVAC Fuses
CRANK, IGN O, TBC ACC, FR WPR, BRKS, and HVAC Fuses
G103, G104, G105, G106, G300, and G301
Data Link Schematics
