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

Steering Wheel Components (4-spoke)


Object Number: 1485895  Size: MF
(1)Horn Switch Contacts
(2)Inflatable Restraint Steering Wheel Module C1
(3)Steering Wheel Control Switch - Right (Chevrolet w/ UK3/K34 shown, Pontiac Similar)
(4)Inflatable Restraint Steering Wheel Module C2
(5)C277
(6)Steering Wheel Control Switch - Left (Chevrolet w/ UK3/K34 shown, Pontiac Similar)
Figure 2:

Steering Wheel Components (3 spoke)


Object Number: 1690780  Size: MF
(1)Steering Wheel Control Switch - Left
(2)Steering Wheel Control Switch Connector- Left
(3)C277
(4)Steering Wheel Control Switch Connector- Right
(5)Steering Wheel Control Switch - Right
(6) Horn Switch Contacts
(7) Horn Switch Connector