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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Transfer Case - NVG 246-NP8 - Service & Diagnosis) >> Diagnostic Information and Procedures >> DTC B2725 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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 Mode Switch Selected parameter.
  6. Select each of the modes.
Does the scan tool indicate that the modes are in the correct state while pressing the mode buttons?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. With the switch disconnected, connect a DMM between the mode switch signal circuit and the 5-volt reference circuit at the switch.
  2. Measure the resistance through the mode switch while pressing and holding each of the mode buttons and comparing values.
Does the DMM indicate all resistance values within the specified ranges?		 Normal: 8.63-9.54 K Ω
2 HI: 1.50-1.53 K Ω
AWD: 61.65-68.15Ω
4 HI: 656-670 Ω
4 LO: 2.32-2.37 K Ω
Neutral: 1.015-1.035 K Ω		 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 and 5-volt reference circuits for a short to voltage, a short to ground, or a high resistance. Refer to Circuit Testing andWiring Repairs .
Did you find and correct the condition?		 - Go to Step 7  Go to Step 6 
5 Replace the mode switch. Refer to Transfer Case Shift Control Switch Replacement .
Did you complete the repair?		 - Go to Step 7  -
6 Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming.
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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