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

Inflatable Restraint Modules and SDM


Object Number: 615328  Size: LF
(1)Inflatable Restraint I/P Module
(2)Inflatable Restraint Steering Wheel Module
(3)Sensing and Diagnostic Module (SDM)
Figure 2:

Discriminating Sensor And Steering Wheel


Object Number: 743096  Size: LF
(1)Inflatable Restraint Steering Wheel Module Coil
(2)Inflatable Restraint Front End Discriminating Sensor
(3)Inflatable Restraint Front End Discriminating Sensor Connector