Three accessories that stopped working
Thread Starter
Newbie
Joined: Mar 2010
Posts: 9
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S420
Three accessories that stopped working
Tech question here:
The lumbar feature in the front seats is not working, and the headrests in the back seat no longer respond to the up/down switch on the dashboard. Also, the antennae that rise from the rear fender when the car is put in reverse are no longer working. All three accessories stopped working at the same time. I thought it might be related to the PSE pump under the back seat and since I had to replace the pump anyway I thought that might cure all those ills. But no go. I checked the fuses I think pertain and everything seems okay there. Is there a common module or relay or something that might be involved?
AlB
The lumbar feature in the front seats is not working, and the headrests in the back seat no longer respond to the up/down switch on the dashboard. Also, the antennae that rise from the rear fender when the car is put in reverse are no longer working. All three accessories stopped working at the same time. I thought it might be related to the PSE pump under the back seat and since I had to replace the pump anyway I thought that might cure all those ills. But no go. I checked the fuses I think pertain and everything seems okay there. Is there a common module or relay or something that might be involved?
AlB
Senior Member
Joined: Jul 2003
Posts: 455
Likes: 1
From: Fl
92 500sel/01 320e wag
It could still be the pump, there is a lot of logic in the pump, including time out safeties, and the solenoids that open and close for consumers. The lumbars are provide "low pressure" via a reservoir but will time out after some minute. The AC is also provided "vacuum" thru a reservoir and the headrest release is provided via a solenoid via the switch. The back up rods are activated thru the back up switch again acting on the PSE. Of course lock and unlock is handled by the same pump, pressure to unlock, vacuum to lock.
My lumbars stopped, but so what, I will figure it out one day.
My lumbars stopped, but so what, I will figure it out one day.
Member
Joined: Feb 2010
Posts: 78
Likes: 0
From: Between Honolulu and Offutt.
1998 and 2002 SL 500, 2014 E550 Convertible
Listen...I don't want you to have headaches..so, just give the car to me!
But seriously...the pump sounds like its bad...it's under the rear seat...passenger side...next to about three other items.
But seriously...the pump sounds like its bad...it's under the rear seat...passenger side...next to about three other items.
Thread Starter
Newbie
Joined: Mar 2010
Posts: 9
Likes: 0
S420
Three accessories
Thank you Peter and Benica for your replies. As it turned out - there were two fuses that had burned out after all - they didn't look blown but I had them replaced anyway and everything started to work. I can now say, finally everything on the car is now working!
Best regards,
Al B
Best regards,
Al B
