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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Case - Mp 3025 (NQH) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC C1162 >> Circuit/System Testing

Circuit/System Testing

  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 Four Wheel Drive Actuator
  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 Four Wheel Drive Actuator

    • If the component does not produce a sound 

      Replace the component:A16 Transfer Case Four Wheel Drive Actuator

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