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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information And Procedures >> DTC C0321 Or C0326: Range Actuator Lock Control >> Component Testing >> K69 Transfer Case Control Module

K69 Transfer Case Control Module

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF. Disconnect the harness connector at the A16 transfer case motor.
    NOTE:
    • Circuit/System Testing must be performed first.
    • Transfer case control module's need to be programmed when replaced. If after programming the K69 transfer case control module comes back as "NO COMM", try reprogramming again. (Internet/vehicle bandwidth load may cause the programming activity to fail.)
  2. Ignition ON, engine OFF. Install EL-49742  harness.
  3. Block wheels. Parking brake engaged. Transmission in Neutral.
  4. Using the PU probes J-35616-4A, connect a test lamp between the battery positive voltage circuit, A16 transfer case motor harness terminal B and the ground terminal of EL-49742  harness, black terminal. The test light should illuminate.
    • If the test light does not illuminate 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
    2. Test for less than 10 Ω in battery positive voltage 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 battery positive voltage circuit, A16 transfer case motor harness terminal B, and a good ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    4. Test for infinite resistance between the battery positive voltage circuit, A16 transfer case motor harness terminal B and all other terminals of the A16 transfer case motor harness connector.
      • 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 Range Actuator Learn procedure. The Range Actuator Learn procedure is also known as the Transfer Case High/Low Clutch Reset procedure. Refer to Transfer Case Control Module Replacement .
    • Go to next step: If the test light does illuminate 
  5. Using the PU probes J-35616-4A, connect a test lamp between the battery positive voltage circuit, A16 transfer case motor harness terminal B and the transfer case lock solenoid control circuit, A16 transfer case motor harness terminal C. The test light should not illuminate.
    • If the test light illuminates 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module.
    2. Test for infinite resistance between the transfer case lock solenoid control circuit, A16 transfer case motor harness terminal C and a good ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    3. Test for infinite resistance between the transfer case lock solenoid control circuit, A16 transfer case motor harness terminal C, and all other terminals of the A16 transfer case motor harness connector.
      • 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 Range Actuator Learn procedure. The Range Actuator Learn procedure is also known as the Transfer Case High/Low Clutch Reset procedure. Refer to Transfer Case Control Module Replacement .
    • Go to next step: If the test light does not illuminate 
  6. Using the Transfer Case Lock function of the Control Function feature of the scan tool, command the transfer case lock ON and OFF. When the lock is commanded ON, release solenoid de-energized, the test light should not illuminate. When the lock is commanded OFF, release solenoid energized, the test light should illuminate.
    • If the test light stays ON when the lock is commanded ON 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module.
    2. Test for infinite resistance between the transfer case lock solenoid control circuit, A16 transfer case motor harness terminal C, and a good ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    3. Test for infinite resistance between the transfer case lock solenoid control circuit, A16 transfer case motor harness terminal C, and all other terminals of the A16 transfer case motor harness connector.
      • 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 Range Actuator Learn procedure. The Range Actuator Learn procedure is also known as the Transfer Case High/Low Clutch Reset procedure. Refer to Transfer Case Control Module Replacement .
    • If the test light does not illuminate when the lock is commanded OFF 
    1. Ignition OFF, disconnect the X harness connector at the K69 transfer case control module.
    2. Test for less than 10 Ω in the transfer case lock solenoid control circuit, end to end.
      • If 10 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 10 Ω, replace the K69 transfer case control module and perform the Range Actuator Learn procedure. The Range Actuator Learn procedure is also known as the Transfer Case High/Low Clutch Reset procedure. Refer to Transfer Case Control Module Replacement .
    • Go to next step: If the test light illuminates when the lock is commanded OFF and turns OFF when the lock is commended ON 
  7. K69 transfer case motor OK.
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