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S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

keyless key fob, won't lock, or unlock, even with new batteries

     
Old Apr 24, 2018 | 06:10 PM
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s500
keyless key fob, won't lock, or unlock, even with new batteries
Since alarm went off , and reset key, now key fob won't work, even after I replaced the 2 batteries.
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Old Apr 25, 2018 | 10:53 AM
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konigstiger
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'71 Pinto
Check fuse, 79 @ right instrument panel.

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Old Apr 25, 2018 | 12:26 PM
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s500
can you say, which one is 79? Trying to get the cars fuse diagram to find a #79 fuse. Thanks.
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Old Apr 25, 2018 | 01:39 PM
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s500
Found and checked fuse #79. Its o.k.--tried a new fuse at #79, same rating,--still persistent issue of key fob.
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Old Apr 25, 2018 | 03:24 PM
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konigstiger
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'71 Pinto
Check second key. Only one key, confirm battery voltage in key. Confirm main battery voltage to vehicle. Check 131 & 152 at rear fuse block if all seems fine suggest having someone pull fault codes using MB DAS (diagnostics).

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