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Rear Deck Subwoofer Amplifier

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E-Class (W212) 2010-present: E 350, E 550

Rear Deck Subwoofer Amplifier

Old 01-10-2019, 08:02 PM
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Mud
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Rear Deck Subwoofer Amplifier

This refers to operation of that amp, it's the small gizmo hanging from the rear deck with what look like heat sinks surrounding a small fan assembly.

Is that fan supposed to be working at all times when the radio/cd is on?
Mine is not working (fan is not locked up) wondering if it's a logic-controlled cooling fan controlled when the heat builds to a certain temperature? Seems that the fan would run as soon as the radio is turned on.So I'm thinking that lack of bass may be to the amp itself not working.

I checked rear trunk fuse panel fuses 67 and 69 that are tagged as "sound system" for continuity, the fuses were fine.
Fuse 67 is 40a labeled as "sound system amplifier control unit".
Fuse 69 is 25a labeled as "rear bass speaker amplifier", so it's this circuit I got interested in.

I have not yet pulled the connector at the sub amp to verify actual power to the unit, just wanted to ask someone about the fan operation as a first quick check. I also need to go back and verify power to the fuse 69 itself.

Last edited by Mud; 01-10-2019 at 08:26 PM.
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Old 01-10-2019, 08:25 PM
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Most fans on amps are regulated by thermal sensors. Run the system at moderate/high volumes for a while and check it again.
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Old 01-10-2019, 09:29 PM
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Will do, I wondered about that but couldn't find anything on the actual amp operation.
If anyone can run a quick check by simply turning the radio on and taking a peek to see if the fan is or isn't initially running I would appreciate it. Just getting a baseline. Thank you.

Last edited by Mud; 01-10-2019 at 09:32 PM.
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Old 01-11-2019, 05:58 PM
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Well I headed out for some errands, had the radio on at medium loud, checked when I got back and that little fan was still off. I can hear bass but it seems to be thru the mid/low range of the speakers, not that distinct "sub" sound. Maybe I'm expecting too much, dunno.
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Old 01-12-2019, 10:52 AM
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Originally Posted by Mud View Post
Well I headed out for some errands, had the radio on at medium loud, checked when I got back and that little fan was still off. I can hear bass but it seems to be thru the mid/low range of the speakers, not that distinct "sub" sound. Maybe I'm expecting too much, dunno.
I'll check mine today. You should definitely hear that thing going, if you stick your head in the trunk while it's working all you should hear is low frequency sound. I have an E46 with HK sound and it's got nothing on the W212, so the bass is definitely there (both have good bass actually). I keep it at +4 and it's plenty enough, at least IMO. Yours might be misbehaving.
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Old 01-12-2019, 10:58 AM
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Thanks very much. I can hear some general bass but it really sounds more like what's coming out if the speakers, not the deep lows. That fan has never come on. I'll pull the connector to at least verify power to that amp.
What really gets me is my own oversight if indeed a failed amp that I didn't notice while the car was still covered under ELW!
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Old 01-12-2019, 11:11 AM
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Until real time feedback f69 is applicable. Subwoofer replacement part # is 2128202302, speaker amp 2118705189 if need be.
Attached Files
File Type: pdf
subwoofer.pdf (193.7 KB, 8 views)
File Type: pdf
rear shelf.pdf (681.9 KB, 3 views)
File Type: pdf
rear seat backrest.pdf (436.3 KB, 1 views)
File Type: pdf
rear seat cushion.pdf (596.4 KB, 1 views)
File Type: pdf
trim at C-pillar.pdf (329.3 KB, 2 views)

Last edited by konigstiger; 01-12-2019 at 11:14 AM.
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Old 01-12-2019, 11:32 AM
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Wow, thank you! I was just checking out the wiring in the WIS as well to verify power at the amp plug. Your info is extremely useful, I appreciate it.
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