23-1 Driver and front passenger airbags
*** Grounding via the housing
# Up to 2009 issue. (inclusive)
# # Since 2010.
23-2 Inflatable curtain
23-3 Seat belt tensioner and tension limiter
* US models
23-4 Crash sensors
23-5 Side airbags
*No longer in use, gradual change
** Gradual change
23-6 Switch and K/L for disabling front passenger airbags
* Models with front passenger airbag switch
23-7 Side seat belt sensor, right front seat occupied sensor
* Except US models
** Models with passenger seat occupancy sensor
23-8 Passenger Seat Occupancy Sensor US Equipped Models
* US models
23-9 Powertrain CAN bus
# Gradual implementation
* Gradual change
23-10,23-11 Control unit in the instrument panel insert
# Up to 2009 issue. (inclusive)
# # Since 2010.
# # # Brown Insert Bridge, Passenger Side
(Read the original source on the website: «AudiManual»)