M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Help!!! Open Hood Warning

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Old 11-04-2020 | 02:22 PM
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2005 Mercedes C230 Kompressor, 2008 GL 320 CDI, 2008 ML320 CDI, 2016 GLE 300d AMG Night Package
Help!!! Hood Open Warning

Hello all,

Two weeks ago on my 08 ML 320 CDI the open hood warning on the IC would come up and Id open and close the hood and it would go away. This was intermittent.

Then, a week ago the hood warning light is permanent and the red hood warning chiming is constant. It drives me nuts.
I checked the wires and they seem ok. I cleaned the hood switch/sensor and put it back in and still a problem.
Then I ordered a new switch and put it back in and still a problem. When the car is parked or when it comes to a stop light or stop sign it stops. As soon as I get passed 3/4 mph the warning comes up again.

First of all, can anyone help me mute the warning chime.
And help me further troubleshoot the issue. I have a 200 miles trip back home this weekend and I am telling you anyone that can bear that noise for that long either has no brain or is deaf.
Thanks in advance for your help

DTCs from rear SAM, IC, OCP, UCP. And front SAM.
Note message: control module A1 ( instrument cluster) is not sending any data comes up in the front sam, rear sam, IC, and OCP.



Upper Control Panel Scan








Attached Files
File Type: mov
IMG_3445.MOV (16.36 MB, 48 views)

Last edited by Dinismb; 11-04-2020 at 04:59 PM. Reason: Typo error
Old 11-04-2020 | 04:41 PM
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What switch did you replace, part # please.
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Dinismb (11-10-2020)
Old 11-04-2020 | 04:54 PM
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2005 Mercedes C230 Kompressor, 2008 GL 320 CDI, 2008 ML320 CDI, 2016 GLE 300d AMG Night Package
Originally Posted by Maj. Dundee
What switch did you replace, part # please.


I replaced this one on the hood latch. OEM part # A2038219251
Old 11-04-2020 | 05:23 PM
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Could you please tell us what module each code was stored in?
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Old 11-04-2020 | 06:10 PM
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2005 Mercedes C230 Kompressor, 2008 GL 320 CDI, 2008 ML320 CDI, 2016 GLE 300d AMG Night Package
Originally Posted by Maj. Dundee
Could you please tell us what module each code was stored in?
code 9189 popped under front SAM module, IC module, and rear SAM.
code c325 - rear sam
code c300 - rear sam
code 9114 - Overhead Control Panel module
code 9702 - IC module
code 9033 - Upper Control Panel module
Old 11-05-2020 | 03:28 AM
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The only code I was able to verify was 9033 in UCP. The other modules showed nothing.

I suggest you delete all codes and wait for the next event. If the Alarm Horn sounds, disconnect the wires. Then check the rear SAM for water entry and corrosion. Everything in the spare tire area must be removed.
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R&I Horn Alarm.PDF (115.7 KB, 97 views)
Old 11-05-2020 | 08:48 AM
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2005 Mercedes C230 Kompressor, 2008 GL 320 CDI, 2008 ML320 CDI, 2016 GLE 300d AMG Night Package
Originally Posted by Maj. Dundee
The only code I was able to verify was 9033 in UCP. The other modules showed nothing.

I suggest you delete all codes and wait for the next event. If the Alarm Horn sounds, disconnect the wires. Then check the rear SAM for water entry and corrosion. Everything in the spare tire area must be removed.

Maj. Dundee, the alarm did go off one night and ever since then I dont lock the car.
I finally did figure out how to mute the chime. I took the IC out and yanked the speaker out.
Old 11-05-2020 | 11:33 AM
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Do yourself a favor and see if your Anti Theft is still working.

Roll down the drives window, close the door and lock it with the key fob. Then reach in and open the door with the inside handle. The anti theft horn shoud.
Old 11-05-2020 | 11:47 AM
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2005 Mercedes C230 Kompressor, 2008 GL 320 CDI, 2008 ML320 CDI, 2016 GLE 300d AMG Night Package
Originally Posted by Maj. Dundee
Do yourself a favor and see if your Anti Theft is still working.

Roll down the drives window, close the door and lock it with the key fob. Then reach in and open the door with the inside handle. The anti theft horn shoud.
Yes the alarm goes off. It honks and fog lights flashing.

Old 11-17-2020 | 12:09 PM
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2005 Mercedes C230 Kompressor, 2008 GL 320 CDI, 2008 ML320 CDI, 2016 GLE 300d AMG Night Package
Originally Posted by Maj. Dundee
Do yourself a favor and see if your Anti Theft is still working.

Roll down the drives window, close the door and lock it with the key fob. Then reach in and open the door with the inside handle. The anti theft horn shoud.
Maj. Dundee,

I figured it was the rear SAM. I took it out wnd cleaned it from minor corrosion and put it back in and the same issue. So I went ahead and ordered a new used SAM coded to my vehicle. All is working now except when I scan the rear sam I get the below message?



Old 11-17-2020 | 01:49 PM
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Do you have a trailer hitch? If you do, delete the code.
Old 11-17-2020 | 01:57 PM
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2005 Mercedes C230 Kompressor, 2008 GL 320 CDI, 2008 ML320 CDI, 2016 GLE 300d AMG Night Package
Originally Posted by Maj. Dundee
Do you have a trailer hitch? If you do, delete the code.
Yes I do have the factory hitch. i delete it and it keeps coming back? Would the trailer module/lights still work? I never got this message on the oem SAM.
Old 11-17-2020 | 02:11 PM
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Originally Posted by Dinismb
Yes I do have the factory hitch. i delete it and it keeps coming back? Would the trailer module/lights still work? I never got this message on the oem SAM.
Here's how things work. When you replace the rear SAM, all data in the old one must be extracted and transferred to the new SAM (read the bottom of pg. 1)

So you must contact the seller and tell him your problem.
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R&I SAM Rear ALL.PDF (135.6 KB, 74 views)

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