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Home >> Cadillac >> 2005 >> Escalade ESV >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Transfer Case - BW 4482-Nr4) >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Inoperative >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2005 GMC Yukon XL and 2005 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.

The mode switch circuit consists of the following four switches:

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

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