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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Inoperative >> Circuit Description

Circuit Description

The range/mode switch circuit consists of the following 5 switches:

The transfer case shift control module supplies a regulated 5 volts, DC, to the switch through the 5 volt regulator circuit. The current travels through the resistor of the currently active switch. The switch then returns the 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 will complete a circuit through the respective resistor. The transfer case shift control module continuously monitors the switch input to determine which of the following buttons is selected by the driver:

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