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2008 ML550 key fob

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Old 06-28-2018, 06:43 PM
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2008 ML550 key fob
Need some assistance. I replaced both auxiliary and main battery on my ML. After that both keys remote stopped working. I can lock and unlock it if I aim the key to the infrared lens on the driver side door. Any help on how to reset or resynchronizing both key fobs? Thanks!
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Old 06-28-2018, 08:40 PM
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read your manual or visit any dealer who will no doubt help you as a courtesy!
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Old 06-28-2018, 09:50 PM
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I read the manual but couldn’t find any instructions on how to reprogram the smart key besides the unlocking sequence.
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Old 06-29-2018, 07:25 AM
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Originally Posted by Nestor25
I read the manual but couldn’t find any instructions on how to reprogram the smart key besides the unlocking sequence.
Start by looking at pg. 116.
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Old 06-29-2018, 09:08 AM
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Originally Posted by Maj. Dundee
Start by looking at pg. 116.
Thanks! I read it and did the process but still only works if I aim the key to the IR eye on the drivers door
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Old 06-29-2018, 09:43 AM
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Originally Posted by Nestor25

Thanks! I read it and did the process but still only works if I aim the key to the IR eye on the drivers door
How did the key operate before?
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Old 06-29-2018, 10:10 AM
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Before I replaced both batteries keys worked fine. I was able to lock and unlock it from a distance, even from inside the house.
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Old 06-29-2018, 01:03 PM
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You have a fault in central locking system------work some OT and get the car diagnosed then you can take a month to fix.
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Old 06-30-2018, 04:33 AM
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Originally Posted by Nestor25
Before I replaced both batteries keys worked fine. I was able to lock and unlock it from a distance, even from inside the house.

Do you have Keyless Go and where do you live?


When you removed the battery, was the key in the ignition?
Last edited by Maj. Dundee; 06-30-2018 at 05:59 AM.
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