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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 C11A4 >> 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.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: A16 Transfer Case Motor
  3. Connect a test lamp between the test points: Control circuit terminal A & Control circuit terminal D
  4. Ignition - On/Vehicle - In Service Mode
  5. Perform the scan tool control function: Range Actuator

    Verify the test lamp state:

    Range Actuator - Idle = Test lamp Off

    Range Actuator - Clockwise = Test lamp On

    Range Actuator - Counterclockwise = Test lamp On

    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X1@K69 Transfer Case Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • Control circuit terminal A@Component harness & Ground
      • Control circuit terminal D@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points:
      • Control circuit terminal A@Component harness & Ground
      • Control circuit terminal D@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points:
      • Control circuit terminal A@Component harness & Terminal 38@Control module harness
      • Control circuit terminal D@Component harness & Terminal 13@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 the specified state 
  6. Verify a condition does not exist with the component: Transfer Case Assembly
    • If a condition exists - Repair or replace as necessary 
    • Go to next step: If no condition exists 
  7. Test or replace the component: A16 Transfer Case Motor
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