Here is a list of the default (pad) MIDI Note map in the TD-17:
KICK = 36
SNARE (HEAD) = 38
SNARE (RIM) = 40
SNARE X-Stick = 37
TOM 1 = 48
TOM 1 (RIM) = 50
TOM 2 = 45
TOM 2 (RIM) = 47
TOM 3 (HEAD) = 43
TOM 3 (RIM) = 58
HH OPEN (BOW) = 46
HH OPEN (EDGE) = 26
HH CLOSED (BOW) = 42
HH CLOSED (EDGE) = 22
HH PEDAL = 44
CRASH 1 (BOW) = 49
CRASH 1 (EDGE) = 55
CRASH 2 (BOW) = 57
CRASH 2 (EDGE) = 52
RIDE (BOW) = 51
RIDE (EDGE = 59
RIDE (BELL) = 53
AUX (HEAD) = 27
AUX (RIM) = 28