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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 appropriate electrical connector: T10 Keyless Entry Antenna
  3. Ignition On - Engine Off
  4. Test for less than 1 V between the test points: Terminal 1 & Ground
    • If 1 V or greater 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: K84 Keyless Entry Control Module
    3. Ignition/Vehicle - On
    4. Test for less than 1 V between the test points: Signal circuit & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K84 Keyless Entry Control Module
    • Go to next step: If less than 1 V 
  5. Ignition/Vehicle & All vehicle systems - Off
  6. Connect a DMM between the test points: Terminal 1 & Ground
  7. Measure = Voltage - (min/max)
  8. Press and hold the switch: Ignition Mode Switch
    • If less than 1 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: K84 Keyless Entry Control Module
    3. Test for infinite resistance between the test points: Signal circuit & 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@Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K84 Keyless Entry Control Module
    • Go to next step: If greater than 1 V 
  9. Test for less than 1 V between the test points: Terminal 2 & Ground
    • If 1 V or greater 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K84 Keyless Entry Control Module
    3. Test for less than 1 V between the test points: Low Reference circuit & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K84 Keyless Entry Control Module
      • Go to next step: If less than 1 V 
  10. Ignition/Vehicle & All vehicle systems - Off
  11. Connect a DMM between the test points: Terminal 2 & Ground
  12. Measure = Voltage - (min/max)
  13. Press and hold the switch: Ignition Mode Switch
    • If less than 1 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: K84 Keyless Entry Control Module
    3. Test for infinite resistance between the test points: Low Reference circuit & 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@Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K84 Keyless Entry Control Module
    • Go to next step: If greater than 1 V 
  14. Replace the appropriate component: T10 Keyless Entry Antenna
  15. Press and hold the switch: Ignition Mode Switch
  16. A message and/or warning indicator may be displayed to the driver. = No Transponder Detected
    • Displays = No Transponder Detected 

      Replace the component: K84 Keyless Entry Control Module

    • Go to next step: Not Displayed = No Transponder Detected 
  17. All OK.
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