
Removing the automatic transmission is discussed in the article - "Removing the automatic transmission"
Install the automatic transmission on the workbench

Disassembling the gearbox primary shaft
Disassembling the shafts is discussed in the article - "Disassembling and assembling the Lada Priora gearbox"

Remove the gearbox (see "Removing and installing the Lada Priora gearbox")
Clean it from dirt on the outside (do not allow dirt to get inside the gearbox)

The additional resistor is used to obtain different rotation speeds of the heater fan motor
If the additional resistor fails, replace it