Shift Motor Brake

The brake in the shift motor consists of a solenoid that when energized, allows the shift motor to rotate. During normal operation (vehicle ignition ON), pin 6 on the shift motor connector will have a constant positive battery potential with respect to the vehicles ground. The FCM allows a return current path through Pin 7 when the brake needs to be released and allow the transfer case to shift. The operating current should not be greater than 1.2 Amps when 12Vdc is applied. The motor brake functions as follows:

• The motor brake must always be released while a shift is taking place.
• The motor brake must always be released for a calibrated amount of time before a shift and after a shift. There is an exception for shifts into a NEUTRAL. The motor brake must always be released for a calibrated amount of time before a shift and after the shift for a period of time greater than 2 but less than 5 seconds.
• The motor brake must always be engaged while a Motor Brake DTC is active.