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Home >> Buick >> 2014 >> Verano Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Keyless Entry System And Remote Functions) >> Diagnostic Information and Procedures >> Keyless Entry System Malfunction (Passive) >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.

Passive Transmitter Malfunction

  1. Lock the vehicle using the keyless entry transmitter.
  2. Verify that each door and rear compartment unlocks and opens by approaching the vehicle with a valid transmitter and operating their respective release handle/touch pad.
    • If both doors and the rear compartment do not unlock/unlatch and open 
    1. Replace the transmitter battery.
    2. Lock the vehicle using the keyless entry transmitter.
    3. Verify that each door and rear compartment unlocks and opens by approaching the vehicle with a valid transmitter and operating their respective release handle/touch pad.
      • If both doors and the rear compartment do not unlock/unlatch and open, replace the transmitter.
      • If both doors and the rear compartment unlock/unlatch and open
    4. All OK.
    • If both doors and the rear compartment unlock/unlatch and open 
  3. The concern may be caused by temporary RF interference. Discuss the conditions in which the concern occurs with the customer. RF interference from aftermarket devices such as 2-way radios, power inverters, cellular phone chargers, computers, etc. may cause a system malfunction. High RF traffic areas, such as gas stations which use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction.

Antenna Circuit Malfunction

    NOTE:

    The A24 exterior door handle assembly has two harness connectors. Of these two harness connectors, make sure that only the T10 door handle keyless entry antenna harness connector is disconnected. Disconnecting both harness connectors will result in the inability to activate the antenna and cause an improper diagnosis.

  1. Ignition OFF, disconnect the harness connector at the inoperative T10 keyless entry antenna, ignition ON.
  2. Test for less than 1 V between the signal circuit terminal 1 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector at the K84 keyless entry control module, ignition ON.
    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. 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.

  3. Ignition OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX function.
  4. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate release handle/touch pad.
  5. Verify the MAX voltage captured by the DMM is greater than 1 V.
    • If 1 V or less 
    1. Ignition 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. Ignition OFF, disconnect the harness connector at the K84 keyless entry control module, ignition ON.
    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. 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.

  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.
  8. Lock the vehicle doors using the keyless entry transmitter. Activate the antenna by operating the appropriate release handle/touch pad.
  9. Verify the MAX voltage captured by the DMM is greater than 1 V.
    • If 1 V or less 
    1. Ignition OFF, disconnect the harness connector at the K84 keyless entry control module.
    2. Test for infinite resistance between the low reference 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 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 1V 
  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 release handle/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.
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