Transfer Case Shift Control Switch Indicator Inoperative - One or More

Transfer Case Shift Control Switch Indicator Inoperative - One or More

Circuit Description
The indicator lamps circuit consists of 3 individual lamps contained inside respective buttons. This assembly is the transfer case shift control switch, with these indicators:
^ 2HI
^ 4HI
^ 4LO

When the ignition switch is placed in the RUN position, current is provided to the switch assembly. The transfer case shift control module (TCCM) provides a ground for the indicators when a particular gear is active or when the transfer case is in transition. Through solid state circuity located inside the switch assembly voltage can be regulated to provide less illumination when the headlamps or parking lights are turned ON.

Test Description

Steps 1-8:

These numbers correspond to the step numbers on the diagnostic table.
2. This step helps to determine intermittent conditions.
3. This step helps to determine if the transfer case range changes with the press of all of the transfer case shift control switch buttons.
4. This step determines if there is a faulty indicator inside the transfer case shift control switch assembly.
5. This step repairs an open in the suspect indicator control circuit.