GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
2001
🢒
GMC C-Series Medium Duty Truck B7
🢒
Body and Accessories
🢒
Wiring Systems
🢒 Brake Warning System Schematics
Brake Warning System Schematics L18
Figure
1:
Driver Information Center, IPC, Fuse Block -- I/P, Power Brake (P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Master Electrical Component List
Brake Warning System Description and Operation
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
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
S105, S261 and S231
Figure
2:
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Master Electrical Component List
Brake Warning System Description and Operation
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch and Interface Module (L18)
Charging Circuit
Starting Circuit
G108 and S220 (L18)
S142, S178, S179, S405 and S409 (L18)
G207, G208 and S221 (L18)
G102 and S138 (L18)
G102 and S138 (L18)
Brake Warning System Schematics LG5
Figure
1:
Driver Information Center, IPC, Fuse Block -- I/P, Power Brake (P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Master Electrical Component List
Brake Warning System Description and Operation
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module (L18)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
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
S105, S261 and S231
Figure
2:
Brake Fluid Level Switch, D201 (ABS Diode), Electronic Brake Control Module (EBCM), Multifunction Alarm Module, Stoplamp Switch Interface Module (LG5)
Master Electrical Component List
Brake Warning System Description and Operation
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
Charging Circuit
Starting Circuit (2 of 2)
Driver Information Center, IPC, Fuse Block - I/P, Power Brake(P/B) Booster Fluid Flow Switch, P/B Booster Pump and Motor, P/B Booster Pump Relay, Stoplamp Switch (LG5)
S220, S229 (LG5 - Late)
S142 and S241 (LG5)
G108, G207, G208 and S221 (LG5)
G101, S138, and S405 (LG5)
