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Home >> Cadillac >> 2021 >> XT5 Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 823 (Transfer Case - Mp 3023/3024 (NQH) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC C11AD or C15AA >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: B139 Transfer Case 2WD/4WD Actuator Position Sensor
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K69 Transfer Case Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 3@Component harness & Terminal 30@ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K69 Transfer Case Control Module
    • Go to next step: If less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 1 & Low Reference circuit terminal 3
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K69 Transfer Case Control Module
    3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 1@ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: 5 V Reference circuit terminal 1@ Component harness & Terminal 20@ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K69 Transfer Case Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K69 Transfer Case Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: 5 V Reference circuit terminal 1@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K69 Transfer Case Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  6. Test for 2.8 to 3.2 V between the test points: Signal circuit terminal 2@Component harness & Ground
    • If less than 2.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K69 Transfer Case Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 2@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Signal circuit terminal 2@ Component harness & Terminal 5@Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K69 Transfer Case Control Module
    • If greater than 3.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K69 Transfer Case Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 2@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K69 Transfer Case Control Module
    • Go to next step: If between 2.8 and 3.2 V 
  7. Replace the component: B139 Transfer Case 2WD/4WD Actuator Position Sensor
  8. Perform the scan tool configuration/reset function: Range Actuator Correlation Learn
  9. Clear DTCs
  10. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Replace the component: K69 Transfer Case Control Module

    • Go to next step: If the DTC is not set 
  11. All OK.
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