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Home >> GMC >> 2004 >> Jimmy 2D Utility, Automatic, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Transfer Case - NVG 236-NP8 >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Indicators Flash Continuously 15 Seconds or More >> Test Description
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Test Description

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

  1. 2:  This step determines the position of the front axle switch.
  2. 3:  This step helps determine if the front axle does not engage.
  3. 4:  This step helps determine if the front axle does not disengage.
Transfer Case Shift Control Switch Indicators Flash Continuously 15 Seconds or More

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 ON, with the engine OFF.
  2. Install a scan tool.
  3. Request AWD mode with the mode switch.
  4. Using the scan tool, observe the Front Axle Switch Status.
Does the scan tool display the Front Axle Switch status as Locked?		 Go to Step 4  Go to Step 3 
3  Using the scan tool, observe the mode that is currently selected.
Is the mode switch indicator illuminated steadily in Auto 4WD, 4WD HI, or 4WD Low mode?		 Go to Front Axle Will Not Engage  Go to Step 5 
4  Using the scan tool, observe the Encoder Gear Position status.
Is the transfer case in 2WD mode?		 Go to Front Axle Will Not Disengage  Go to Step 5 
5 Replace the transfer case shift control module. Refer to the Transfer Case Shift Control Module Replacement .
Did you complete the repair?		 Go to Step 6  -
6
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle in order to determine if the symptom has been corrected.
Is the symptom still present?		 Go to Step 2  System OK
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