It is not listed in the om. There is a button on the steering column just below the height adjuster TM well big T and little m in an unusual font.

Does not seem to do anything and cannot find any info on it?

2006 Hawkeye WRX Type UK

 

Its for trafficmaster

 

Ahh ok would make sense and with an aftermarket stereo obviously redundant now.

Thanks for the help.