Transfer Case Shift Control Switch Indicator Always on - Two or More

Transfer Case Shift Control Switch Indicator Always on - Two or More

Circuit Description

The indicator lamps circuit consists of three individual lamps contained inside their respective buttons making up the transfer case shift control switch assembly. They are the 2HI, 4HI and 4LO indicators. When the ignition switch is placed in the RUN position, current is provided to the switch assembly. The transfer case shift control module 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

The numbers below refer 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 shift control module is commanding more than one indicator ON.
4. This step tests and repairs a short to ground in the indicator control circuits.
5. This step tests if more than one indicator control circuits are shorted together.

Switch Indicator Lamps Remain ON - Two or More