Circuit Description
The range/mode switch circuit consists of the following 5 switches:
| • | 2HI |
| • | 4HI |
| • | 4LO |
| • | AUTO 4WD |
| • | Neutral |
The transfer case shift control module supplies a regulated 5 volts, DC to the switch through the 5 volt regulator circuit. The current travel through the resistor of the currently active switch. The switch then returns current to the transfer case shift control module through the switch signal circuit.
The transfer case shift control module constantly monitors this signal voltage to determine the condition of the mode switch circuit.
When each switch is depressed, the switch completes a circuit through the respective resistor. The transfer case shift control module continuously monitors the switch input to determine which of the following buttons were selected by the driver:
| • | 2HI |
| • | 4HI |
| • | 4LO |
| • | AUTO 4WD |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Transfer Case Control Schematics Connector End View Reference: Transfer Case Control Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the state change with the selection of any of the mode positions? | Go to Step 5 | Go to Step 3 | |
3 | Replace the transfer case shift control switch. Refer to Transfer Case Shift Control Switch Replacement . Did you complete the repair? | Go to Step 5 | -- |
4 | Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | Go to Step 5 | -- |
5 |
Is the symptom still present? | Go to Step 2 | System OK |
