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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Transfer Case - BW 4474) >> Diagnostic Information and Procedures >> DTC C0399: Transfer Case Clutch Control >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the M71 Transfer Case Clutch Coil.
  2. Ignition ON, engine OFF..
    3. NOTE:
    • When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616 GM-Approved Terminal Test Kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.
    • Testing for steps 2-3 is performed on the M71 Transfer Case Clutch Coil harness connector using the PU probe J 35616-4A, and K69 Transfer Case Control Module harness connector X1 using the GY probe J 35616-2A.
    • The low side driver of the low reference circuit has a high resistance to chassis ground when not activated, greater than 15 K Ω.
    • Testing for steps 2-3 is performed within 15 seconds of using the key fob to unlock the doors. After 15 seconds the voltage on the control circuit will drop to the diagnostic 0.15-0.40 V.
    • An alternate method to using the key fob to activate the control circuit is to perform steps 2-3 with the engine running. With the engine running, the voltage on the control circuit should be a constant 3.4-3.9 V.
  3. Test for 3.4-3.9 V between the control circuit, terminal A, and ground.
    • If less than 3.4 V 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 Transfer Case Control Module.
    2. Test for less than 10 Ω in control circuit end to end.
      • If 10 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 10 Ω
    3. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    4. Test for infinite resistance between the control circuit, terminal 5, and all other pins of the K69 Transfer Case Control Module harness connector X1.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K69 Transfer Case Control Module and perform the Transfer Case Clutch Identifier Configuration/Reset function. Refer to Transfer Case Control Module Scan Tool Information .
    • If greater than 3.9 V 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 Transfer Case Control Module.
    2. Ignition ON, engine OFF.
    3. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    4. Test for infinite resistance between the control circuit, terminal 5, and all other pins of the K69 Transfer Case Control Module harness connector X1.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K69 Transfer Case Control Module and perform the Transfer Case Clutch Identifier Configuration/Reset function. Refer to Transfer Case Control Module Scan Tool Information .
    • If between 3.4-3.9 V 
  4. Test for 3.4-3.9 V between the control circuit, terminal A, and the low reference circuit, terminal B.
    • If less than 3.4 V 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 Transfer Case Control Module.
    2. Test for less than 10 Ω in the low reference circuit end to end.
      • If 10 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 10 Ω
    3. Test for infinite resistance between the low reference circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    4. Test for infinite resistance between the low reference circuit, terminal 4, and all other pins of the K69 Transfer Case Control Module harness connector X1.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K69 Transfer Case Control Module and perform the Transfer Case Clutch Identifier Configuration/Reset function. Refer to Transfer Case Control Module Scan Tool Information .
    • If greater than 3.9 V 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 Transfer Case Control Module.
    2. Ignition ON, engine OFF.
    3. Test for less than 1 V between the low reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    4. Test for infinite resistance between the low reference circuit, terminal 4, and all other pins of the K69 Transfer Case Control Module harness connector X1.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K69 Transfer Case Control Module and perform the Transfer Case Clutch Identifier Configuration/Reset function. Refer to Transfer Case Control Module Scan Tool Information .
    • If between 3.4-3.9 V 
  5. Control circuit, low reference, and K69 Transfer Case Control Module OK.
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