This procedure covers the removal and replacement of the roof-mounted antenna assembly on a 2014-2019 Toyota Corolla, including the antenna mast and base unit.

Warnings

Tools required

Parts

• Antenna assembly (mast and base) × 1 — 86337-02110 or aftermarket equivalent
• Antenna gasket/seal × 1 — Use OEM specification if deteriorated

Preparation

1. Park vehicle on level surface and turn off ignition
2. Ensure radio is off to prevent potential speaker damage
3. Gather clean rags or protective covering for headliner area

Procedure

1. 1

   Remove antenna mast
   From outside the vehicle, unscrew the antenna mast by turning counterclockwise. The mast should thread off the antenna base by hand. If stuck, use a strap wrench or apply penetrating oil and wait before attempting removal.
2. 2

   Access headliner area
   Open the driver's door and locate the coat hook/assist handle area near the front pillar. Carefully pry down the rear edge of the headliner approximately 6-8 inches from the front pillar on the driver's side to access the antenna base mounting area. Work gently to avoid creasing the headliner.
3. 3

   Disconnect antenna cable
   Locate the antenna cable connector attached to the base of the antenna assembly. Press the release tab and pull the connector straight down to disconnect. Note the routing of the cable for reinstallation.
4. 4

   Remove antenna base mounting bolt
   Using a 10mm socket with extension, remove the single mounting bolt securing the antenna base to the roof. Support the antenna base from the outside with your other hand to prevent it from falling.
5. 5

   Remove antenna base assembly
   From outside the vehicle, carefully lift the antenna base assembly straight up and out of the roof opening. Remove the rubber gasket/seal from the roof or base assembly and inspect for damage or deterioration.
6. 6

   Clean mounting surface
   Clean the roof opening and surrounding area with a clean rag. Remove any dirt, debris, or old sealant residue. Inspect the roof opening for any signs of water damage or rust.
7. 7

   Install new antenna gasket
   Position the new or reused gasket (if in good condition) onto the base of the new antenna assembly. Ensure the gasket is seated properly in its groove to prevent water intrusion.
8. 8

   Install antenna base
   From outside the vehicle, carefully lower the new antenna base assembly into the roof opening, aligning the mounting hole with the threaded insert in the roof. Ensure the gasket seats evenly against the roof surface and the cable connector hangs down into the headliner area.
9. 9

   Install mounting bolt
   From inside the vehicle, thread the 10mm mounting bolt through the base and into the roof insert. Tighten by hand first, then snug with socket wrench. Do not overtighten as this can compress the gasket excessively or crack the base.
10. 10

    Reconnect antenna cable
    Push the antenna cable connector firmly onto the base connector until you hear or feel it click into place. Gently tug to verify it is fully seated and locked.
11. 11

    Install antenna mast
    From outside the vehicle, thread the antenna mast clockwise onto the antenna base by hand. Tighten firmly by hand only - do not use tools. The mast should seat solidly without excessive force.
12. 12

    Restore headliner
    Carefully press the headliner back into its original position, ensuring all edges are properly seated and there are no visible gaps or creases. Verify the coat hook or assist handle area is properly positioned.

Reassembly

1. Verify antenna mast is hand-tight and properly aligned vertically
2. Check that headliner is smooth and properly positioned with no visible damage
3. Ensure no tools or parts were left in the headliner area

Verification

• Turn on radio and test AM and FM reception across multiple stations to verify proper antenna function
• Inspect antenna base gasket area from outside for proper sealing with no gaps visible
• Gently wiggle antenna mast to ensure base is securely mounted with no movement
• After next rain or car wash, inspect headliner around antenna area for any signs of water leakage

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