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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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:  This step tests the transfer case electrical control of the lamp circuits.
  2. 3:  This step helps determine module failures.
  3. 4:  This step tests the affected indicator control circuit for an open or high resistance.
  4. 5:  This step tests the LED dimming supply 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 
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. Using the scan tool, command all the indicators ON.
Do all the indicators illuminate?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Access the back of the mode switch.
  2. Backprobe the indicator control circuit of the affected indicator to ground.
Does the affected indicator go ON?		 Go to Step 7  Go to Step 4 
4  Test the affected indicator control circuit for an open or high resistance.
Did you find and correct the condition?		 Go to Step 8  Go to Step 5 
5  Test the LED dimming supply circuit for an open or short to ground.
Did you find and correct the condition?		 Go to Step 8  Go to Step 6 
6 Replace the transfer case shift control switch. Refer to Transfer Case Shift Control Switch Replacement .
Did you complete the repair?		 Go to Step 8  -
7 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement  and Transfer Case Control Module Reprogramming .
Did you complete the repair?		 Go to Step 8  -
8
  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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