GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Air Brakes 🢒 Air Brake Warning System Schematics
Figure 1:

Driver Information Center (DIC), IPC, Fuse Block -- I/P, Stoplamp Switch
Object Number: 725746 Size: FS
Master Electrical Component List
Brake Warning System Description and Operation
Low Air Pressure Switch, Multifunction Alarm Module
HAZ, HORNS, PNL, STOP LP and TL/MKR Circuit Breakers
IGN 1 Circuit Breaker, S225, S226, S230
IGN 1 Circuit Breaker, S232, S243
Instrument Panel Cluster (IPC), CHECK GAUGES Indicator, Engine Coolant Temperature (ECT), and Engine Oil Pressure (EOP) Gauges and Voltmeter
Driver Information Center (DIC), ABS, CHANGE OIL, DRL, ENGINE OVERSPEED, HIGH IDLE, INTAKE HEATER, LOW AIR, LOW COOLANT, PRIMARY BRAKE and SERVICE ENGINE SOON Indicators
Automatic Engine Shutdown and Warning
Low Air Pressure Switch, Multifunction Alarm Module
Low Air Pressure Switch, Multifunction Alarm Module
Low Air Pressure Switch, Multifunction Alarm Module
Low Air Pressure Switch, Multifunction Alarm Module
Low Air Pressure Switch, Multifunction Alarm Module
S105, S261 and S231
Figure 2:

Low Air Pressure Switch, Multifunction Alarm Module
Object Number: 725749 Size: FS
Master Electrical Component List
Brake Warning System Description and Operation
Driver Information Center (DIC), IPC, Fuse Block - I/P, Stoplamp Switch
Charging Circuit
Charging Circuit
Driver Information Center (DIC), IPC, Fuse Block - I/P, Stoplamp Switch
Driver Information Center (DIC), IPC, Fuse Block - I/P, Stoplamp Switch
Driver Information Center (DIC), IPC, Fuse Block - I/P, Stoplamp Switch
Driver Information Center (DIC), IPC, Fuse Block - I/P, Stoplamp Switch
Driver Information Center (DIC), IPC, Fuse Block - I/P, Stoplamp Switch
Starting Circuit
Starting Circuit (2 of 2)
G108 and S220 (L18)
S220, S229 (LG5 - Late)
G207, G208 and S221 (L18)
G108, G207, G208 and S221 (LG5)
S142, S178, S179, S405 and S409 (L18)
S142 and S241 (LG5)
G102 and S138 (L18)
G101, S138, and S405 (LG5)