GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C Sierra - 2WD 🢒 Body and Accessories 🢒 Seats 🢒 Heated Seats Schematics
Figure 1:

Cell 143: Passenger Heater Seat Switch, Right Bussed Electrical Center
Object Number: 295204 Size: FS
Power Seat Systems Components
Heated Seats Circuit Description
Cell 143: Driver Heater Seat Switch, Splice Pack 203
Cell 10: Underhood Bussed Electrical Center, Bussed Fuses
Cell 10: Left Bussed Electrical Center, Electronic Brake Control Module
Cell 10: Underhood Bussed Electrical Center, Automatic Transfer Case
Cell 10: Left Bussed Electrical Center, Electronic Brake Control Module
Cell 10: Left Bussed Electrical Center, Electronic Brake Control Module
Interior Lights Schematics
Cell 14: Passenger Seat Bolster Switch, Passenger Power Seat Switch
Cell 14: Passenger Seat Bolster Switch, Passenger Power Seat Switch
Cell 14: Temperature Door Motor, Passenger Heated Seat Switch, Roof Marker Lamps
Cell 14: Temperature Door Motor, Passenger Heated Seat Switch, Roof Marker Lamps
Cell 14: Temperature Door Motor, Passenger Heated Seat Switch, Roof Marker Lamps
Figure 2:

Cell 143: Driver Heater Seat Switch, Splice Pack 203
Object Number: 295203 Size: FS
Power Seat Systems Components
Heated Seats Circuit Description
Cell 143: Passenger Heater Seat Switch, Right Bussed Electrical Center
Cell 10: Underhood Bussed Electrical Center, Bussed Fuses
Cell 10: Left Bussed Electrical Center, Electronic Brake Control Module
Interior Lights Schematics
Cell 10: Underhood Bussed Electrical Center, Data Link Connector
Cell 14: Passenger Seat Bolster Switch, Passenger Power Seat Switch
Cell 14: Passenger Seat Bolster Switch, Passenger Power Seat Switch
Cell 14: Full Feature Seat Heated/Memory Seat Switch, Light Bar Switch
Cell 14: Full Feature Seat Heated/Memory Seat Switch, Light Bar Switch