Transfer Case Shift Control Sw Indicator Inop - One or More
Transfer Case Shift Control Switch Indicator Inoperative - One or MoreCircuit Description
The indicator lamps circuit consist of 5 individual lamps contained inside the mode/range switch assembly. The following lamps are contained inside the respective range button:
^ AUTO 4WD
^ 2HI
^ 4HI
^ 4LO
Each time the ignition is cycled all 5 mode indicators light simultaneously as an indicator check to ensure proper operation of the indicators. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current-limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in the parklamp or headlamp position. When the solid state circuit receives voltage from the headlamp switch, the circuit will reduce the voltage that is supplied to the indicator lamps, dimming the lamps when the headlamps are ON.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests the transfer case electrical control of the lamp circuits.
3. Helps determine module failures.
4. Tests the effected lamp circuit for an open or high resistance.
5. Tests the lamp feed circuit for an open or short to ground.
Transfer Case Shift Control Switch Indicator Inoperative - One or More (1 Of 2):
Transfer Case Shift Control Switch Indicator Inoperative - One or More (2 Of 2):
