Mercedes-Benz S430 trunk will not open using key, remote, or interior release on Mercedes-Benz S430

Submitted by flashg · Jun 23, 2025
Published by RepairPal

Problem overview

Some Mercedes-Benz S430 owners report experiencing difficulties with their trunk not opening using the key, remote, or interior release. Common issues include defective trunk equipment, such as a faulty black round box, which can prevent proper operation. Additionally, a dead battery may necessitate alternative methods for unlocking the trunk, such as using a button on the driver's side door panel. Owners should also check for a locked trunk switch located in the glove box, as this can inhibit access. Another potential problem is a vacuum leak in the trunk central closing system, which may require resetting the system by pulling fuse number 62. Regular maintenance, including inspecting the latch and lubricating hinges, is crucial to prevent trunk latch problems caused by misalignment, faulty sensors, or stuck actuators. Prompt attention to these issues is essential for maintaining the functionality of the trunk.

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