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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different car >> Section 411 (Transfer Case - BW 4482-Nr4) >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Indicator Always On - Two or More >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Yukon XL and 2004 GMC Yukon. 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 determines if the module can command the indicators ON.
  2. 3:  This step determines if the indicator or wiring is at fault.
Transfer Case Shift Control Switch Indicator Always On - Two 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 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 the transfer case mode.
  2. Use this information to determine which lamp circuits are at fault.
  3. Disconnect the 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 circuit shorted to ground?		 Go to Step 4  Go to Step 6 
4
  1. Disconnect the transfer case shift control module.
  2. Test the suspect lamp circuits for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Is the suspect circuit 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.
Did you find and correct the condition?		 Go to Step 8  -
6 Replace the mode 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 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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