which AUX are you talking about? the one that goes in the glove compartment or the one in the rear console under the vents?

Since you're in Sinagapore, not sure if all the equipment is the same as here in the US. i though they got rid of the cassette player in the 2001 or 2002 model years.

I know that the CD slot is separate from the MID unit, but not completely sure if they're just plug and play, but it would seem like it would be.