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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 >> Service Indicator Always On >> 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 number below refers to the step number on the diagnostic table.

  1. 2:  Determines whether the failure is the result of a faulty transfer case shift control module or the instrument cluster.
Service Indicator Always On

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 the SERVICE 4WD Message OFF.
Does the SERVICE 4WD Message turn OFF?		 Go to Step 3  Go to INSTRUMENT PANEL CLUSTER (IPC) REPLACEMENT in Instrument Panel, Gages, and Console
3 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
Is the repair complete?		 Go to Step 4  -
4
  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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