Method and system for controlling a two-speed transfer case

A transfer case control system for controlling mode and range of a vehicle transfer case, said transfer case control system comprising:

• a mode-selection solenoid operable to engage or disengage a drive axle via said vehicle transfer case;
• a range-selection solenoid operable to effect a range selection of either HIGH range or LOW range to be effected via said vehicle transfer case;
• a control module electronically coupled to said mode-selection solenoid and to said range-selection solenoid;
• a plurality of data inputs electronically coupled to said control module;
• and
• a plurality of selector switches actuatable by a vehicle operator, said plurality of selector switches including indicating means for providing a visual indication of transfer case status and a visual alert to the vehicle operator when a selected operation is not allowed, wherein a specific set of data inputs is required in order for the transfer case control system to allow said selected operation.

A method of controlling a transfer case which is a part of a vehicle drive system, said vehicle drive system including an electronics package and a pair of selector switches accessible to a vehicle operator, said method of controlling including the following steps:

• a.) engaging a control switch to select 4WD;
• b.) monitoring a signal lamp to assess the status of the 4WD selection;
• c.) verifying that the vehicle is in 4WD mode;
• d.) engaging a control switch to select a LOW gear ratio;
• and
• e.) monitoring a signal lamp to assess the status of the LOW gear ratio selection.