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memory seat module

Reply #15 –
update

there is a single wire jumper brown connector shown in earlier pics which represent a memory neutral module.
i just looked close and that jumper is really specific.  so specific that ford actually put "FORD" on the wire and an E7 part number ,, all this info directly on the wire itself.

to the red light blue question............
when in start, battery voltage is present on the Red light blue wire coming into the connector.
the shown jumper is a special named ford red light blue as well.

the the ford red blue jumper connects to a red / white.
the red / white wire travels under the carpet up to a gray 12 pin connector.
this red/white wire changes back to red light blue which then terminates on the PCB of the memory module.

with the key in the cranking or start position, i have battery voltage present all the way up to the PCB of the memory seat module.


oddly,, i have a VSS code mentioned in the previous post!! yet no speedo malfunction is noticed.  maybe ill pull the codes on my speedo.

memory seat module

Reply #16 –
does anyone know of a good forum to bring this issue to that might have more insight?

i have questions like "if the door switch push botton system is not in the game", will the console functions still operate etc.
i think the answer is yes to my question.

so a bench test can be done if i am able to use the basics,, power input, provide an input and output ground, then apply 12vdc to the respective motor inputs and expect a relay to ciick then expect 12dc output to the coordinated expected wire color.

maybe this is uncharted territory,, nothing on the web is found yet using my various searches.

memory seat module

Reply #17 –
There must be sensor inputs for the memory module to know where the seat is located.
The main seat motor assembly has three motors. It should also have three sensors as a part of this assembly.
You should have two cables coming from this motor assembly to the memory module.
One of the cables is for the motors. Get the color codes from your EVTM.
The other cable is for the sensors. It should have five wires. A voltage reference and signal return to the three sensors and three sense wires.

If the memory module doesn't see the sensors, nothing works.
These sensors don't require any mechanical motion to have an output. They can be used as a "proximity" sensor to detect a nearby magnetic field and to measure how far away it is. ( This is what I have concluded on how it must work after reading a bunch of stuff.)
Diagram for 97 Explorer:

memory seat module

Reply #18 –
Will look again

memory seat module

Reply #19 –
I am looking more closely now.. the memory seat setup has been that one mystery that i didnt care about till now.

I see that for memory seat ford made the motors separate from thier respective gear box.

the motor has a cable that drive its very own gear box.

there are three wires on each gear box which i expect would be the hall effect sensors.

so......... it appears the seats position is infact like what you said,,,, seat track sensors are actually there just not on the track but on the gear box cable plug in connector.

see attached.

all these hall effect wires go to one connector.  there are three wires on each of the three gear boxes.

inside the wire loom as the hall effect sensors travel as input signals to the memory seat, some of the wires are spliced together as "common".

they all arrive on a gray 8 pin connector.

"Yes" to your edited photo asking me if the sensors are in the heat shrink tubing.

now to figure out which of these three are getting zero signal.

since the EVTM does not show these three conductors job, i will find out on a single gear box which one represents the windings and which one represents the wiper.

at that point i should be able to maniuplate the signal on the defective one to allow manual seat controls to work.

next i will have to figure out how that connector comes off in order to attempt a repair if needed.

IN one group of 3 yellows which splice to one yellow ,, the single splice end fell of so i cant be sure this was me who broke it or the connection was on the outs.

all the splces are cad welds.

Actually the first thing i will do is reterminate all the wiring and jumper around the splices,, then wiggle test the hall effect connetors while i manually make/break seat controls.

im thinking that when i find the issues be it intermittant or what have you ,, i will get a red LED light to atleast come on showing a fault.

memory seat module

Reply #20 –
I would assume that this memory seat setup has to be in another Ford product of the same era. I doubt they would go through the trouble of creating a system just for the 87 20th. If you could find out what other car has the system (probably some Lincoln) there may be a more detailed testing procedure in the shop manual for that particular car.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

memory seat module

Reply #21 –
I agree,
other Linc Cont forums keep telling me there is no way my system i provided pictures of is stock to a ford!!
THey keep saying that i Must have a Neutral module as a separate item.
the color codes to the N module match to the single wire jumper connector i show inside the center console which is special ink stamped with a ford pn.

I am speculating that the system may be infact the first run of its kind and perhaps was only a two year deal in the 87/88 birds and cougs only.
its not matching anything else out there

memory seat module

Reply #22 –
Here is a quick wiring diagram not included in the evtm with respect to the gear box sensors.

the motor(s) drive a cable. 
the cable turns and thus the gearbox moves.
the three wires on each gear box have two commons and one separate wire.

From the bonded group of Y/G qty 3 to the bonded group of Y/B qty 3 i have 10mg ohms.
From the bonded group of Y/BL to the G/BK & to the R/W and the R/Y i have about 10mg each

from the bonded group of Y/G to the G/BK & to the R/W and to the R/Y i have an open circuit.

see quick sketch below.

while the system was re-installed today i made an oem splice repair and performed a wiggle test of all the seat position sensors.
nothing positive to report.

there happens to be something that looks like an onboard battery on the motherboard. its called "CR xxxx " something.  not sure on the actual board nomenclature but seems like the right size to be a coin type battery cell.  I had no battery in my 20th for about 10 months.

this thingy i call out is in one of my pics if you look,, its round and red near a 90deg heat sync.
 

memory seat module

Reply #23 –
I just glanced at the 88evtm link in my sig to see if that diagram offers more detail...
apparently there is more info in 88 than in 87.

the 88evtm says to ref shop manual 41-08 for more troubleshooting / diag tests.

hummm

wonder who has an 88 shop manual set??????????????????????????

memory seat module

Reply #24 –
Quote from: thunderjet302;463533
I would assume that this memory seat setup has to be in another Ford product of the same era. I doubt they would go through the trouble of creating a system just for the 87 20th. If you could find out what other car has the system (probably some Lincoln) there may be a more detailed testing procedure in the shop manual for that particular car.


looked again,,, 85 and 86 evtm index does not call out memory seats diagrams.  It shows up in 87.  its revised somehow in 88. 
my motor pn in one of my pics show the to be 86  "E6". 

Im thinking the engineering for memory  seat was done during 86 in order to make ready new orders for Q1 fy87.

memory seat module

Reply #25 –
interesting softtouch,,  the explorer diagram also shows the hall effects gathering up as 5 individual conductors as well.  ,,, matches 87 layout but colors are not.

memory seat module

Reply #26 –
The memory neutral module was engineered out of the picture. The EVTM says C457 is a brown 6 pin connector. This the connector that has the jumper.
The "hot in start" R/LB ckt 32 now goes directly to the seat memory module. This is how it's shown in later model cars.
This requires the trans to be in park or neutral before you can "recall" a seat position from the memory module.
This is a safety thing. You don't want a 5'2'' wife to accidently push a button and move the seat to her 6'2'' husbands' position while she is driving. This may move her out of reach of the pedals.

memory seat module

Reply #27 –
The two wires that go all the sensors are a reference voltage and a signal return(ground) supplied by the seat memory module.
It would be a good idea to see what voltages you have on the 5 sensor wires.

By the way, I don't see any keyed power to this memory seat stuff. Looks like it only has "hot at all times" power.
Fuse 8 and fuse 12 supply this power.

memory seat module

Reply #28 –
The 93 Continental EVTM shows a Start Button next to the LED on the seat memory module for running self tests.
Yours has a label saying this feature is disabled. Looks like you are out of luck there.

memory seat module

Reply #29 –
Quote from: softtouch;463569
It would be a good idea to see what voltages you have on the 5 sensor wires.

.

I thought the same when it was back installed, now its again removed but im getting pretty good and quick at re installing.
besides,, if i install again, might as well fix one of my seat bolt anchor nuts.

wtg to see if the assist on shop manuals for 88 come through on my other electrical tech post.