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Old 28th July 2019, 19:27   #1
matchless
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Default Memory seat issues not able to resolve

Hi,
I cant get my drivers seat to work at all, I have replaced the seat control ecu with a known working one, no luck.
Replaced the complete seat with a known working one, no luck.
The only common theme is that the memory button sounds once if pressed and held for a while, which is the same with my original seat, the replacement seat control ecu, and the complete replacement seat.
This is driving me mad (excuse the pun) , as the cars mot has expired, so I cant get it to a T4 guru, and I only have a few days left before it has to sit a new mot again.
Any ideas?
Thanks
Paul
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Old 28th July 2019, 19:34   #2
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Sorry, forgot what I was going the say.
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Old 28th July 2019, 20:02   #3
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Is power getting to the switches?

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Old 28th July 2019, 20:08   #4
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Seeing as time is against you. I would get a plug from the scrapyard and wire in a temp loom to allow seat movement, at least this will get you the mot.
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Old 28th July 2019, 20:09   #5
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Default Seat power

Thanks for the reply,
I did put a (borrowed) multimeter on a few pins on the main loom,and got 12+volts, but not sure where/how to check if the seat switches are getting any power, I did presume some power was getting there as the memory button sounds when held.
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Old 29th July 2019, 21:54   #6
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This is a document I drew up when faultfinding on mine. Hope it helps you as well.

IGN on
Test thick wires on the loom plug
Black = earth
Yellow = earth
Orange/Yellow = 12v
Orange/Green = 12v
Orange/white = 12v

Thin Slate/Grey = earth

this is how my wiring loom works out
driver seat

pin 1 thick yellow=heated seat=Earth to Thin Yellow
pin 2 thick orange/white=heated seat=Live to Thin orange/white

pin 3 thick black=earth to same
pin 4 thick orange/yellow=live to same
pin 5 thin purple/grey=live to Thin brown/white
pin 6 thin red/white/=k bus to Pink
pin 7 thin black/grey=logic earth to same
pin 8 thick orange green=live to same

SEAT SWITCH
At the module connector.
Using a suitable 12v supply and earth, and wires with probes suitable to hold in pin sockets (twisty bits of wire, matches, or cocktail sticks at your own risk
Connect Black pin to earth.

Momentarily Connecting 12v to Yellow/White pin , OR (not both) 12v to White/Yellow pin , will directly power the motor to move the seat forward/back, this will allow access to the seat mounting bolts. Momentarily Connecting 12v to the Yellow/Pink and Pink/Yellow pins will adjust the backrest if needed

Black = Earth
Yellow/White = Forward
White/Yellow = Back

Yellow/Pink = Backrest
Pink/Yellow = Backrest
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Last edited by hortonds; 31st July 2019 at 18:01..
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Old 30th July 2019, 07:03   #7
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Quote:
Originally Posted by hortonds View Post
This is a document I drew up when faultfinding on mine. Hope it helps you as well.

IGN on
Test thick wires on the loom plug
Black = earth
Yellow = earth
Orange/Yellow = 12v
Orange/Green = 12v
Orange/white = 12v

Thin Slate/Grey = earth

this is how my wiring loom works out
driver seat

pin 1 thick yellow=heated seat=Earth to Thin Yellow
pin 2 thick orange/white=heated seat=Live to Thin orange/white

pin 3 thick black=earth to same
pin 4 thick orange/yellow=live to same
pin 5 thin purple/grey=live to Thin brown/white
pin 6 thin red/white/=k bus to Pink
pin 7 thin black/grey=logic earth to same
pin 8 thick orange green=live to same

SEAT SWITCH
At the module connector in the above picture,
Using a suitable 12v supply and earth, and wires with probes suitable to hold in pin sockets (twisty bits of wire, matches, or cocktail sticks at your own risk
Connect Black pin to earth.

Momentarily Connecting 12v to Yellow/White pin , OR (not both) 12v to White/Yellow pin , will directly power the motor to move the seat forward/back, this will allow access to the seat mounting bolts. Momentarily Connecting 12v to the Yellow/Pink and Pink/Yellow pins will adjust the backrest if needed

Black = Earth
Yellow/White = Forward
White/Yellow = Back

Yellow/Pink = Backrest
Pink/Yellow = Backrest
this is really useful, thank you. If its not in the How To section I'd say put it there, How To Test Electric Seat

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