Can't set power SEAT position MEMORY ("1" & "2"). Memory Module cause? - Mercedes-Benz Forum
 
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post #1 of 4 (permalink) Old 03-17-2018, 06:52 PM Thread Starter
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Can't set power SEAT position MEMORY ("1" & "2"). Memory Module cause?

In 84 300sd (w126), front LH (driver) power seat has seat position memory (according to the Owner's Manual).
My power seats work in all directions, but I CAN'T SET SEAT POSITION MEMORY (“1” or “2”).
...So...if everything else related to seat position memory is known good (below), is this failure to “remember” seat position “1” or “2” probably in the 34-year old Memory Module (126-820-0026) under the seat?
...If yes, can a Memory Module be returned to full function by “rebuilding” its electronics - resoldering all the solder points and replacing any electrolytic capacitors? (...as can be done in, for example, a Cruise Control Amplifier, or in a Climate push-button Control).
Thank you for your consideration.

Related...as far as I can tell, the following are good:
...the Power Separation Relay (001-542-0219 in Fuse Box “E”)
...the Seat Control Relay (001-542-0219 in Fuse Box “A”)
...the three (3) seat position memory-related push buttons (green, “1”, and “2”) on the Door Switch (003-820-2710 on the LH driver door), and
...the wiring from the door Switch to the Memory Module under the driver seat.

Again, thank you for your consideration.
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post #2 of 4 (permalink) Old 03-18-2018, 07:28 AM
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Are you following the correct procedure. Green button and number button have to be simultaneously depressed for at least 30 seconds with ignition on or engine running.
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post #3 of 4 (permalink) Old 03-19-2018, 12:23 PM Thread Starter
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My 84 300sd (w126) Owner's Manual says (page 17) with the ignition key in position "2", "...press the memory [green] button, and, within 3 seconds, the position button "1" [or "2"]." No mention of holding for 30 seconds in my manual. Nonetheless, I tried your suggestion of holding both green and "1" for more than 30 seconds, but it still did not "remember" the seat position.
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post #4 of 4 (permalink) Old 03-19-2018, 06:50 PM
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As far as I know, the procedure above (green button, then position number within 3 seconds) is correct.

John
"Real engines don't have spark plugs!"
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