Toyota TUNDRA-2005 Owner's Manual page 233

Audio remote controls (steering switches)
232
'05 TUNDRA_U (L/O 0409)
Some parts of the audio system can be
adjusted using the switches on the steer-
ing wheel.
Details of the specific switches, controls,
and features are described below.
1. Volume control switch
2. " " switch
3. "MODE" switch
2005 TUNDRA from Sep. '04 Prod. (OM34432U)