GF28.19-P-3000A Transfer Case Control System, Function

GF28.19-P-3000A Transfer case control system, function

Function sequence:

Road ratio (High) - cross-country ratio (Low)
^ Stop the vehicle
^ Selector lever in position "N"
^ Engine idling
^ Operate "Low Range" switch (S97/6)
^ The "Low Range" indicator lamp (A1e53) in the instrument panel flashes 3 times in two seconds during the shift process.
^ The transfer case control module (N78) actuates the electric actuator motor (A55). This rotates and initiates the change in ratio via a mechanical connection in the transfer case.
^ After the shift process is complete, the "Low Range" indicator lamp (A1e53) remains illuminated.

Off-road ratio (Low) - road ratio (High)
^ Stop the vehicle
^ Selector lever in position "N"
^ Engine idling
^ Operate "Low Range" switch (S97/6)
^ The "Low Range" indicator lamp (A1e53) in the instrument panel flashes 3 times in two seconds during the shift process.
^ The transfer case control module (N78) actuates the electric actuator motor (A55). This rotates and initiates the change in ratio via a mechanical connection in the transfer case.
^ After the shift process is complete, the "Low Range" indicator lamp (A1e53) goes out.

Component Identification: