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

W221 TRUNK CLOSE BUTTON SWITCH HELP

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Old Dec 8, 2019 | 10:02 PM
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Mercedes Benz S550
W221 TRUNK CLOSE BUTTON SWITCH HELP

2008 S550,trunk opens from door panel, from remote control, from trunk button but doesn't goes up automatically, needs to be open by hand and same way to close.

The open and close red button doesn't illuminate.

It was working fine before until the day i left the trunk opened for about an 40minutes, then the close button didn't illuminate and i pressed, it didn't close the trunk.

Since then, I have been slamming and pulling it manually. I tested the voltage going to the switch, i got 11+ voltage. So I replaced the Trunk lock close button switch, but still didn't illuminate.

Does any one know which fuse controls the close button switch? or is there anything else since i got 11volt from one of the switch wires?


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Old Dec 9, 2019 | 09:29 AM
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Pull 147 @ rear SAM for 15 minutes or so with trunk closed in an attempt to reset RTC CU.

Last edited by konigstiger; Dec 9, 2019 at 01:22 PM.
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Old Dec 9, 2019 | 10:10 PM
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Originally Posted by konigstiger
Pull 147 @ rear SAM for 15 minutes or so with trunk closed in an attempt to reset RTC CU.
Thanks man. It says remote trunk closing?
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Old Dec 10, 2019 | 07:49 AM
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Does your data card show code 881 if so, 147 (control unit) is applicable.
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Old Dec 12, 2019 | 06:59 PM
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Originally Posted by konigstiger
Does your data card show code 881 if so, 147 (control unit) is applicable.
thank you. Pls I'm a rookie. What do you mean by data card code?
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Old Dec 13, 2019 | 08:29 AM
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VIN?
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Old Dec 13, 2019 | 04:15 PM
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Originally Posted by konigstiger
VIN?
WDDNG71X28A194970
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Old Dec 13, 2019 | 04:34 PM
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Vehicle is equipped with 881 remote boot lid closing so pull 147 @ rear SAM for 15 minutes or so with trunk closed in an attempt to reset control unit. No guarantee nevertheless, worth a try.



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Old Dec 13, 2019 | 07:25 PM
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Mercedes Benz S550
Originally Posted by konigstiger
Vehicle is equipped with 881 remote boot lid closing so pull 147 @ rear SAM for 15 minutes or so with trunk closed in an attempt to reset control unit. No guarantee nevertheless, worth a try.


my 147 has no fuse connection
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Old Dec 14, 2019 | 09:41 AM
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Odd, check your PM.
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Old Jan 10, 2020 | 04:56 PM
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THANKS TO EVERYONE THAT CONTRIBUTED.. IT WAS THE MODULE THAT GOT CORRODED. I think water got inside
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Old Feb 7, 2020 | 09:44 AM
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Originally Posted by azontodance
THANKS TO EVERYONE THAT CONTRIBUTED.. IT WAS THE MODULE THAT GOT CORRODED. I think water got inside

So now with the new module, the trunk pulls up, but doesn't go down with the button or remote. I have to pull it down with my hand.

But it pulls up when open with remote or button
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Old Feb 9, 2020 | 05:43 PM
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Originally Posted by azontodance
So now with the new module, the trunk pulls up, but doesn't go down with the button or remote. I have to pull it down with my hand.

But it pulls up when open with remote or button
Did you have the dealer install it or do it yourself? It will need to be calibrated using SDS to work properly.
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Old Feb 10, 2020 | 06:28 PM
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Originally Posted by Polar Bear
Did you have the dealer install it or do it yourself? It will need to be calibrated using SDS to work properly.
sotry, it not a brand new. It a used module from ebay
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