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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 C1162 >> 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 & All vehicle systems - Off
  2. Disconnect the electrical connector: A16 Transfer Case Motor
  3. Ignition - On/Vehicle - In Service Mode
    4. NOTE:

    Within 2 min

  4. Test for 10.5 to 11.5 V between the test points: 12 V Reference circuit terminal B & Ground
    • If less than 10.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K69 Transfer Case Control Module
    3. Test for infinite resistance between the test points: 12 V Reference circuit terminal B@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: 12 V Reference circuit terminal B@Component harness & Terminal 33@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 11.5 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: 12 V Reference circuit terminal B@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 10.5 and 11.5 V 
  5. Test for less than 1 V between the test points: Control circuit terminal C & Ground
    • If 1 V or greater 
    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: Control circuit terminal C@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 less than 1 V 
  6. Ignition/Vehicle - Off
  7. Disconnect the electrical connector: K69 Transfer Case Control Module
  8. Test for infinite resistance between the test points: Control circuit terminal C@Component harness & Ground
    • If less than infinite resistance - Repair the short to ground on the circuit. 
    • Go to next step: If infinite resistance 
  9. Test for less than 2 ohms between the test points: Control circuit terminal C@Component harness & Control circuit terminal 34@Control module harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit. 
    • Go to next step: If less than 2 ohms 
  10. Connect the electrical connector: A16 Transfer Case Motor
  11. Ignition/Vehicle - Off
  12. Connect a 3 A fused jumper wire between the test points: 12 V Reference circuit terminal 33@Control module harness & B+
  13. Momentarily connect a jumper wire between the test points: Control circuit terminal 34@Control module harness & Ground

    Verify the component produces a clicking sound: A16 Transfer Case Motor

    • If the component does not produce a sound 

      Replace the component: A16 Transfer Case Motor

    • Go to next step: If the component produces a sound 
  14. Replace the component: K69 Transfer Case Control Module
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