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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1316 (Transfer Case - NVG 246-NP8 (Two Speed Automatic)) >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Indicator Inoperative - One or More >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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 the transfer case electrical control of the lamp circuits.
  2. 3:  Helps determine module failures.
  3. 4:  Tests the effected lamp circuit for an open or high resistance.
  4. 5:  Tests the lamp feed circuit for an open or short to ground.
Transfer Case Shift Control Switch Indicator Inoperative - One or More

Step Action Yes No
Schematic Reference:  Transfer Case Control Schematics  
1 Was the Transfer Case Diagnostic System Check performed? Go to Step 2  Go to Diagnostic System Check - Transfer Case 
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Install a scan tool.
  3. Use the scan tool in order to command all the indicator lamps ON.
Do all the lamps turn ON?		 Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems. Go to Step 3 
3 
IMPORTANT: Take note not damage a connector or circuit when back probing.
  1. Access the back of the mode switch.
  2. Using a fused jumper back probe the effected indicator control circuit to ground.
Does the effected lamp turn ON?		 Go to Step 4  Go to Step 5 
4  Test the effected lamp circuit for an open or high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 Go to Step 8  Go to Step 7 
5  Test the lamp feed circuit for an open or short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 Go to Step 8  Go to Step 6 
6 Replace the mode/range switch. Refer to Transfer Case Shift Control Switch Replacement .
Is the repair complete?		 Go to Step 8  -
7 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
Is the repair complete?		 Go to Step 8  -
8
  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 2  System OK
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