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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 831 (Transfer Case - BW 4482-Nr4) >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Inoperative >> Circuit Description

Circuit Description

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The mode switch circuit consists of the following 4 switches:

The transfer case shift control module supplies a regulated 5 volts DC to the switch through the 5 volt reference 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:

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