DAEDALUS wrote:I only know what the shiny tool catalogs tell me.
Ah, yes! Now I know what this is!
It allows you to activate the transmitter when the tires are rotated (or wheel is replaced) ... to reset the system to recognize the particular I.D.s sent by each transmitter.
As I also recall, there is a procedure in the service manual to avoid having to use this tool. Basically, you set each tire's pressure to a different value for each tire location and drive for a while - might still need a Consult though. Then, after the system recognizes the transmitter ID, you return the pressure to normal values!
I will search for this in the M45 Service Manual ... but I will also make a guess that Sidvicious does not need this for a tire replacement. He just has to be careful to not damage the transmitter when the old tire is removed!