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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 Always On - Two or More >> Test Description

Test Description

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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 a short to ground in the suspect lamp circuits.
  3. 4:  Test the suspect lamp circuits for a short to ground.
  4. 5:  Repair short to ground in the suspect lamp circuit.
Transfer Case Shift Control Switch Indicator Always On - Two 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 OFF.
Do all the lamps go OFF?		 Go to Step 7  Go to Step 3 
3 
  1. Use the scan tool in order to determine which mode the transfer case is in.
  2. Use this information to determine which lamp circuits is at fault.
  3. Disconnect the range/mode switch.
  4. Test the suspect lamp circuits for a short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Is the suspect circuits shorted to ground?		 Go to Step 4  Go to Step 6 
4 
  1. Disconnect the transfer case shift control module.
  2. Re-test the suspect lamp circuits for a short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Is the suspect circuits shorted to ground?		 Go to Step 5  Go to Step 7 
5  Repair short to ground in the suspect lamp circuit. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 Go to Step 8  -
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 allowing the symptom to re-occur.
Does the symptom re-occur?		 Go to Step 2  System OK
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