How to disable seatbelt chime on Mercedes C-Class W204 2008 Iamcarhacker

By Juraj · Last updated: May 3, 2026

This guide shows how to permanently disable the seatbelt warning chime on a Mercedes-Benz C-Class W204 (2007–2014) using OBDeleven. The procedure deactivates both the front and rear seatbelt warning logic via the SRS / instrument cluster modules, so the car stops nagging when belts are unbuckled. No fault codes, no warning lights, fully reversible.

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Used tool in this guide

OBDeleven 3

latest generation OBDeleven adapter with improved hardware for VAG coding, adaptations and diagnostics via smartphone

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Video: How to disable seatbelt chime on Mercedes C-Class W204

This video shows the full procedure on a 2008 Mercedes C-Class W204 — from connecting OBDeleven over Bluetooth, locating the correct One-Click Apps in the newly added Mercedes coverage, to applying both the rear seatbelt warning and seatbelt warning type apps to fully silence the chime.

Supported vehicles

Vehicle
c-w204

Technical overview

Item	Details
Vehicle	Mercedes-Benz C-Class W204
Year	2008
System	Instrument cluster / SRS (seatbelt warning logic)
Procedure type	Comfort / behavior tweak
Difficulty	Easy
Time required	~5 minutes
Prerequisites	OBDeleven device, OBDeleven app on phone, active Pro subscription (One-Click Apps require Pro credits), ignition ON, Bluetooth paired

Step-by-step procedure

Plug the OBDeleven dongle into the OBD2 port (under the dashboard, driver’s side on W204).
Turn the ignition ON (engine off is fine).
Open the OBDeleven app on your phone and connect to the dongle over Bluetooth.
Select Mercedes-Benz as the vehicle brand, then pick C-Class W204.
Navigate to the One-Click Apps section. Important: when Mercedes coverage was first added, the apps list can take a few seconds to populate — at first glance it may look empty. Wait a few seconds before assuming nothing is supported.
Find and run the Rear seatbelt warning app. Set it to OFF and apply.
Find and run the Seatbelt warning type app. Set it to OFF and apply.
Cycle the ignition off and on. Test by sitting in the driver seat without fastening the belt and starting the engine — no chime should sound.

You need both apps for full silence: one app alone leaves part of the warning logic active. Front-only deactivation typically still triggers when a passenger is detected; the rear-seatbelt app finishes the job on cars without rear seat occupancy sensors triggering.

Additional Information & Compatibility Notes Before using or purchasing any diagnostic tool for this procedure, always verify compatibility with your exact vehicle model, year and system configuration. Supported functions may vary depending on software version, hardware revision and regional limitations.

OBDeleven Mercedes coverage was added relatively recently and is expanding — older app versions may not show these One-Click Apps, so make sure the OBDeleven app is updated to the latest version. The W204 facelift (post-2011) uses a slightly different cluster firmware; both apps still apply but the menu labels can differ slightly.

This procedure is fully reversible — re-running the same apps and setting them back to ON restores factory behavior.

Alternative tools

Best OBD2 scanners for Mercedes

Related guides & background information

How to deactivate seatbelt warning with OBD2 scanner

Legal & safety notice

This procedure modifies vehicle system settings through the control module. Incorrect use may cause faults or warning lights. Always ensure the vehicle is secured and follow proper safety procedures.