emma_eagle43
Mercedes B Klasse Hybrid Electric Seat Issue
Summary of the thread
A 2020 Mercedes B Klasse hybrid had an issue with the passenger electric seat not adjusting, with a scan tool showing an error related to the seat. The problem was suspected to be linked to a weak or discharged battery, which can cause electrical issues. After replacing the battery and clearing the error memory, the seat functioned correctly, resolving the issue at the quoted cost.
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4 comment(s)
emma_eagle43 (community.author)
Thanks! I haven't checked the resting voltage myself, but the shop mentioned it. The passenger seat is completely dead. Where is the seat module located? I might check it with a multimeter before paying for the repair.
linda_jung32
If the seat's completely unresponsive, a dead battery is even more suspect. The seat module is usually under the seat. You'll probably have to remove the seat to get access. Disconnect the battery first! Given the shop suspects the battery and you're getting a dead seat, I'd get the battery professionally tested. It could save you diagnostic hassle. The error stored in the memory is a solid lead.
emma_eagle43 (community.author)
You were spot on. It was a heavily discharged battery causing the electric seat to fail. They replaced the battery, cleared the error memory, and the passenger seat is now working perfectly. Total cost was 290€ as quoted. Thanks for your input, it really helped me narrow down the problem.
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MERCEDES
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BKLASSE
linda_jung32
I had a similar issue with my B Klasse. The power seats draw a fair bit of current. Have you checked the battery's resting voltage? A weak battery can cause electrical issues. Is the seat completely dead, or does it try to move and then stop? It could also be a faulty seat module or a wiring harness problem.