The article you refer to and the codes within are only for the climate control. Every system has codes on your car and only the ones from climate control can be viewed this way. The codes that are responsible for the check engine light are stored in trhe DM (diagnostic module) on the 96. It also has engine codes in the HFM-SFI module and the EA/CC/ISC module. In 97 all was incorporated into the ME module.
The light and the codes are delt with using an OBDII scanner or some version of full car scanner.
BTW the body codes you got from the A/C on your 96 should be the same as those in trhe article for a 97. Should be the same till 99.
Bosch Master, ASE Master, L1
33 years MB technician