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Test Description

WARNING: This page is about a different car, the 2004 GMC Yukon XL and 2004 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Tests for voltage at the ignition 3 voltage side of the transfer case select switch.
  2. 3:  Tests the control circuit of the neutral indicator for a short to voltage or an open.
  3. 4:  Tests the control circuit of the neutral indicator for a short to ground.
DTC B0790

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-Transfer Case? Go to Step 2  Go to Diagnostic System Check - Transfer Case 
2 
  1. Turn the ignition OFF.
  2. Remove the transfer case select switch.
  3. Disconnect the connector on the transfer case select switch.
  4. Turn the ignition ON.
  5. Probe the Ignition 3 voltage circuit with a DMM that is connected to a good ground.
Does the DMM indicate battery voltage?		 Go to Step 3  Go to Step 6 
3  Test the neutral indicator control circuit for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 4 
4  Test the neutral indicator control circuit for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 5 
5 Inspect for poor connections at the harness connector of the transfer case shift control module, and the transfer case shift control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
6 Repair the ignition 3 voltage circuit of the transfer case select switch for an open, high resistance or short to ground.
Did you complete the repair?		 Go to Step 9  -
7 Replace the transfer case shift control switch, and clear all DTCs. Refer to Transfer Case Shift Control Switch Replacement .
Does the DTC reset?		 Go to Step 8  System OK
8 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
Did you complete the repair?		 Go to Step 9  -
9
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 1  System OK
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