XC90 AWD L6-2.9L Turbo VIN 91 B6294T (2004)
Steering Mounted Controls Communication Module: Description and Operation
Steering wheel buttons
The steering wheel buttons control functions and menu selection for:
Traffic information (option)
Cruise control (option).
The signals from the steering wheel buttons are transmitted via serial communication.
The steering wheel buttons are connected in series to the steering wheel module (SWM) via contact reel in the steering wheel hub. The steering wheel
buttons are connected in the following order, counted from the contact reel:
1. Cruise control
2. Audio /carphone
3. Traffic information.
There are diagnostics for the steering wheel buttons.