Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2015 >> Volt >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless Entry System And Remote Functions >> Diagnostic Information and Procedures >> Keyless Entry System Malfunction (Passive) >> Circuit/System Testing >> Antenna Circuit Malfunction

Antenna Circuit Malfunction

  1. Vehicle OFF, disconnect the harness connector at the inoperative T10 Keyless Entry Antenna, Vehicle in Service Mode.
  2. Test for less than 1 V between the signal circuit terminal 1 and ground.
    • If 1 V or greater 
    1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K84 Keyless Entry Control Module.
    • If less than 1 V 
  3. Vehicle OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX function.
    NOTE: When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.
  4. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate exterior door handle button/rear closure touch pad.
  5. Verify the MAX voltage captured by the DMM is greater than 1 V.
    • If 1 V or less 
    1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K84 Keyless Entry Control Module.
    • If greater than 1 V 
  6. Test for less than 1 V between the low reference circuit terminal 2 and ground.
    • If 1 V or greater 
    1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the low reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K84 Keyless Entry Control Module.
    • If less than 1 V 
  7. Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture DC voltage using the MIN MAX function.
    NOTE: When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.
  8. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate exterior door handle button/rear closure touch pad.
  9. Verify the MAX voltage captured by the DMM is greater than 1 V.
    • If 1 V or less 
    1. Vehicle OFF, disconnect the harness connector at the K84 Keyless Entry Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K84 Keyless Entry Control Module.
    • If greater than 1 V 
  10. Replace the appropriate T10 Keyless Entry Antenna.
  11. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate exterior door handle button/rear closure touch pad.
  12. Verify that the door/rear compartment unlocks and opens when the release handle/touch pad is operated.
    • If the door/rear compartment does not unlock and open 

      Replace the K84 Keyless Entry Control Module.

    • If the door/rear compartment unlocks and opens 
  13. All OK.
scientia non olet · About Mike's Workshop Manuals