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Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step tests for proper operation of the transfer case mode select switch.
  2. 3:  This step tests the mode switch for proper resistance values in all mode switch states.
  3. 4:  This step tests the switch signal wire for a short to ground, short to voltage, or high resistance.
DTC B2725

Step Action Values 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 - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. Start the engine.
  3. Set the parking brake.
  4. Place the transmission into NEUTRAL.
  5. With a scan tool, observe the 4WD indicator modes in the tech 2 transfer case data list.
  6. Select each of the modes.
Does the scan tool indicate that the 4WD indicators are in the correct state?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Connect a DMM between the selector mode switch signal and voltage from the 5-volt reference circuit at the switch.
  2. Measure the resistance through the mode switch while selecting the modes and comparing values.
Does the DMM indicate all resistance values within the specified ranges?		 2 HI: 230-245 ohms
AWD: 526-580 ohms
4 HI: 1,042-1,107 ohms
4 LO: 2,039-2,165 ohms
Neutral: 4,467-4,743 ohms		 Go to Step 4  Go to Step 5 
4 
  1. Disconnect the transfer case shift control module connectors C1 and C2.
  2. Test the switch signal for a short to voltage, a short to ground, or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 7  Go to Step 6 
5 Replace the selector mode switch. Refer to Transfer Case Shift Control Switch Replacement .
Did you complete the repair?		 - Go to Step 7  -
6
IMPORTANT: After transfer case shift control module replacement and reprogramming, ensure all doors are closed and the key is out of the ignition, then open and close the doors again and wait 2 minutes to avoid incomplete programming or false communication DTCs.
Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming. Perform the Clutch Reset Procedure. Refer to Transfer Case High/Low Clutch Reset .Did you complete the repair?		 - Go to Step 7  -
7
  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 set?		 - Go to Step 2  System OK
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