Transfer Case Shift Control Switch Inoperative

Transfer Case Shift Control Switch Inoperative





Test 1-6

Circuit Description
The transfer case shift control switch circuit consists of three normally open switches. The transfer case shift control module supplies a regulated 8 volts DC to the switch through the 8 volt reference circuit. The current travel through a 9.09 K 0 resistor located inside the switch. Then switch returns current to the transfer case shift control module through the 4WD switch signal circuit.
The transfer case shift control module constantly monitors this signal voltage to determine the condition of the shift control switch circuit. If no buttons are pressed, and the transfer case shift control module detects a voltage level outside the possible range (approximately -0.5 to 1.0 volts) for longer than 5 minutes, the transfer case shift control module will set this DTC or if a button is held down or sticks for a period longer than 5 minutes.
When each of the switches is depressed they will complete a circuit through their own specific resistor.
The transfer case shift control module continuously monitors the switch input to determine whether the 41-11, 21-11, and 41-0 button selections are made by the driver. Neutral may be obtained if the following conditions are met:
^ The engine is running.
^ The automatic transmission is in neutral (or the clutch pedal is depressed on a manual transmission application).
^ The vehicle speed is below 3 mph.
^ The transfer case is in the 21-11 mode.
Once these conditions have been met, pressing and holding both the 21-11 and 41-0 buttons for 10 seconds will shift the transfer case into neutral, turning on the red neutral indicator lamp.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This steps tests the functionality of the transfer case shift control switch buttons.
3. This step tests the modules ability to operate the transfer case modes.