Interior Smart Key Antenna Module for Keyless Entry and Start

This cabin antenna receiver ensures your vehicle senses the key fob inside the car and authorizes push-button start. It delivers stable signal coverage in the roof/room area, keeping passive entry and start functions smooth, secure, and fast. Ideal for fixing “Key Not Detected” messages and intermittent no-start issues.

Why this part is needed

Without a healthy interior antenna, the body control system cannot confirm the fob is inside. That means no ignition ON, repeated start attempts, or random start cut-offs. Replacing a weak or dead unit restores OEM-level reliability and security.

How it works

The module emits a low‑frequency field that “wakes” the fob. The fob answers via RF; the control unit checks the code and then lets you start the engine with the Start/Stop button. Its location in the headliner/room zone helps pinpoint the fob is truly inside, preventing unauthorized starts.

What happens if it’s broken ⚠️

Symptoms include: no crank with button, sporadic starts, need to hold the fob against the switch, warning chimes, and stored keyless DTCs. Doors may unlock, but start authorization fails. Ignoring it can leave you stranded.

Install tips ✅

Disconnect battery, avoid kinking the coax lead, keep metal objects away from the antenna face, and verify with both fobs. A quick scan-tool check to clear codes and confirm signal is recommended.

Compatibility

• Q40/G Sedan
• Q50
• Q60/G Coupe
• Q60/G Convertible
• G37 Sedan