GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Center of Floor Console


Object Number: 374756  Size: LF
(1)Heated Seat Switch
(2)Heated Seat Switch Connector
Figure 2:

Driver Seat


Object Number: 389015  Size: LF
(1)Seat Belt Switch
(2)Lumbar Adjuster Relay
(3)Seat Cushion Cover
(4)Front Seat Finish Panel
(5)Seat Adjuster Switch
(6)Lumbar Adjuster Switch
(7)Lumbar Adfjuster Switch and Seat Adjuster Switch
(8)Seat Heater Control Module
(9)Seat Heater Control Module