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HOMESERVICE MANUALSBUICK2018REGAL BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 64 (REMOTE FUNCTIONS SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESKEYLESS ENTRY SYSTEM MALFUNCTION (PASSIVE)CIRCUIT/SYSTEM VERIFICATION
2018 Buick Regal Base

Circuit/System Verification

2018 Buick Regal BaseSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify that DTC B3119, B3120, or B3121 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify that the vehicle key is correct for the vehicle. This can be accomplished by comparing the part number printed on the key to the appropriate part number in the parts catalog.
    • If the vehicle key is incorrect 

      Replace the vehicle key.

    • Go to next step: If the vehicle key is correct 
  4. Verify the scan tool Exterior Driver Door Handle Switch, Exterior Passenger Door Handle Switch, and Trunk Lid Exterior Unlatch Switch parameters change between Active and Inactive while operating their respective exterior door handle button/rear closure touch pad.
    • Go to next step: If all of the parameters change 
  5. Lock the vehicle using the keyless entry transmitter.
  6. Verify that each door and the rear compartment unlocks and opens by approaching the vehicle with a valid transmitter and operating their respective exterior door handle button/rear closure touch pad.
    • If both doors and the rear compartment do not unlock/unlatch and open 

      Refer to Passive Transmitter Malfunction in Circuit/System Testing.

    • If only one door or the rear compartment does not unlock/unlatch and open 

      Refer to Antenna Circuit Malfunction in Circuit/System Testing.

    • Go to next step: If both doors and the rear compartment unlocks/unlatches and opens 
  7. All OK.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.