This procedure covers the removal and replacement of the roof-mounted antenna assembly on a 2016-2021 Honda Civic with 1.5L turbo engine.

Warnings

Tools required

Parts

• Roof antenna assembly × 1 — Use OEM Honda part 39150-TBA-A01 or equivalent
• Antenna base gasket/seal × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and turn off ignition
2. Ensure roof area around antenna is clean and dry
3. Gather all tools and replacement parts before beginning

Procedure

1. 1

   Access the antenna mounting area
   Open the front doors and locate the overhead console area near the antenna base. You may need to carefully pull down the edge of the headliner near the antenna to access the mounting hardware. Do not force the headliner - it should flex gently.
2. 2

   Remove interior trim panel if equipped
   On some Civic trims, there is a small interior access panel or the overhead console must be partially lowered. Use the trim removal tool to carefully release any clips securing the panel. Work slowly to avoid breaking the plastic clips.
3. 3

   Disconnect antenna cable
   Locate the antenna cable connector behind the headliner. Press the release tab and pull the connector straight back to disconnect. Note the routing of the cable through any clips or guides - take a photo for reference during reinstallation.
4. 4

   Remove antenna mounting bolts from interior
   Using the 10mm socket and extension, remove the antenna mounting bolts from inside the vehicle. There are typically 2-3 bolts securing the antenna base to the roof. Support the antenna from the exterior with one hand while removing the final bolt to prevent it from falling.
   ⚠Have someone support the antenna from outside or use tape to prevent it from sliding off the roof once the bolts are removed
5. 5

   Remove old antenna assembly
   From the exterior, carefully lift the antenna assembly straight up and away from the roof. Remove the old gasket/seal from the roof surface. Clean the mounting surface thoroughly with a microfiber cloth, removing any dirt, old adhesive, or debris.
6. 6

   Install new gasket and position antenna
   Install the new antenna base gasket onto the roof mounting surface, ensuring it is properly aligned with the mounting holes. Position the new antenna assembly onto the gasket, aligning the mounting holes and cable port. The antenna should sit flush against the gasket.
7. 7

   Install mounting bolts
   From inside the vehicle, thread the mounting bolts by hand through the roof and into the antenna base. Start all bolts before tightening any of them. Tighten the bolts in a cross pattern to ensure even pressure on the gasket. Torque the mounting bolts to specification.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
8. 8

   Connect antenna cable
   Route the antenna cable through the original clips and guides as noted in your reference photo. Connect the antenna cable to the base connector, pushing firmly until you hear and feel a positive click. Ensure the connection is secure by gently tugging on the cable.
9. 9

   Reinstall interior trim
   Carefully reposition the headliner and reinstall any trim panels or overhead console components removed earlier. Press firmly on all clip locations to ensure they are fully seated. Verify that all panels are flush and properly aligned.

Reassembly

1. Ensure all interior trim panels are securely fastened and aligned properly
2. Verify the antenna base sits flush against the roof with no gaps visible around the gasket

Verification

• Turn on the vehicle and test AM/FM radio reception on multiple stations to confirm proper antenna function
• Check for water leaks after the next car wash or rain event - inspect the headliner near the antenna for any moisture
• Visually inspect the exterior antenna base to ensure the gasket is properly sealed with no visible gaps
• Verify the antenna is secure by gently attempting to move it - there should be no play or movement

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