No worries.
Chapter 12-36 in the Haynes manual has the electrical schematic/pin-out for '95 and earlier typical e36 power mirror switch. 12-47 for '96 and later typical e36 power mirror switch. But it doesn't specify for the 318ti.
The Bentley manual adresses the 318ti specifically. ELE-242 in the Bentley manual has the schematic and pin-out for the 318ti power mirror switch.
Sometimes the internet just doesn't have it and you gotta refer to the book