Home alot now with my projects

[Fredrik73]

Fredrick,

OK I just remembered. I do not have a schematic of the FEM. If you have the electrical service book like mine, then this is how you reverse engineer it:
Get an Ohm Meter with sharp pin test leads. You need to break through the clear coating applied to all components.

The MOSFETs transistors have Gate and Source marked as G and S. The Drain pin is in the middle and is not marked. That is the one you want to connect to most of the time.
The power window MOSFETs are N Channel since they apply a ground to operate (just like tail lights and headlights), go ahead and measure from pin 1 and/later pin 2 of FEM connector C201G.

From pin 1 and later pin 2 measure a short or very low resistance to all 11 MOSFETS Drain (the unmarked middle pin).
Locate which Q # (like Q21 etc) is associated with pins 1 and pin 2 of FEM connector C201G. This connector has 4 big pins to handle FEM power and Driver's Power window.

After you have found which Q numbers correspond to C201G pins 1 and 2, let me and all of us know.

When I have time I will try to identify all the other MOSFETS and recommend replacement part numbers and sources. The lights should be easy. All the N channel transistors should be the same. So far, I have only found two P channel circuits, dash lights and power steering solenoid.

Time to stop information overload. To be continued.
Hermann

i made a video to showw how i did it with no result


https://www.youtube.com/watch?v=XHcOjXKaSnk

[Fredrik73]

Plug pin number to Q Power transistor numbers I have started on, will be here. I will edit this post as I add FEM info.
Connector:
C201a
pin 9 goes to Q35 Power Steering.
pin 4 goes to Q__Turn Stop Hazard Lamps.
pin 5 goes to Q__Turn Stop Hazard Lamps.
pin 6 goes to Q__External Lamps
pin10 goes to Q__Auto Lamps__
pin17 goes to Q__Auto Lamps
pin 7 goes to Q__Auto Lamps
pin 8 goes to Q__Auto Lamps

C201C
pin 2 goes to Q__Turn Stop Hazard Lamps.

C201e
pin 11 goes to Q36 ??? Instrument Cluster

C201g
pin 2 goes to Q__ Power Windows
pin 1 goes to Q__ Power Windows

C201b
pin21 goes to Q__ P93 Battery Junction Box Relays K321 K322 K323 K324
pin14 goes to Q__ Windshield Washer Pump








To be continued

Hermann this is what i measured hope we can use it
Fredrik

R=Right
M=Midle
(IF LOOKING AT THE MOFET SO YOU SEE THE TEXT, LEGS DOWN)


C201a

Pin 1 goes to: Q35R

Pin 2 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 3 Goes to: no connection with MOFET

Pin 4 goes to: Q25M Turn Stop Hazard Lamps.

Pin 5 goes to: Q34M Turn Stop Hazard Lamps.

Pin 6 goes to: Q21M External Lamps

Pin 7 goes to: Q32M Auto Lamps

Pin 8 goes to: Q29M Auto Lamps

Pin 9 goes to: Q35M Power Steering.

Pin 10 goes to: Q31M Auto Lamps__

Pin 11 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 12 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 13 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 14 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 15 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

pin17 goes to: no connection with MOFET

pin17 goes to: Q26M Auto Lamps



C201C
pin 2 goes to Q__Turn Stop Hazard Lamps. .................................... no connection with MOFET

C201e
pin 11 goes to Q36 ??? Instrument Cluster ..................................... Q36M

C201g
pin 2 goes to Q__ Power Windows .................................................. .. no connection with MOFET
pin 1 goes to Q__ Power Windows ................................................ no connection with MOFET

C201b
pin21 goes to Q__ P93 Battery Junction Box Relays K321 K322 K323 K324 no connection with MOFET
pin14 goes to Q__ Windshield Washer Pump .................................. no connection with MOFET

[Fredrik73]

You will also need 11 new .insulating sill pads for the transistors.

IC18 may be a regulator and may be the entire problem. You need to apply 12 volts to the power plug and measure the pins and see if 12v goes in and what comes out. Maybe +5 volts comes out.

I don't recomend replacing all transistors.

i will do that tomorrow
why does the time go so quick when you have fun? the klock is 2:15 PM now must go to bed

[Fredrik73]

here is a maby usefull MOFET?

https://www.datasheetq.com/datasheet...irchild/76419P

[HKS]

here is a maby usefull MOFET?

https://www.datasheetq.com/datasheet...irchild/76419P

Max current 27 Amps. Maybe enough. The case looks like it is too thick and the spring fingers might be hard to get back on.
I will dig up what I have found.and edit this post.
HKS

Here is an N channel transistor I found.
https://www.jameco.com/z/IRF520-Majo...MaAvtuEALw_wcB

P Channel
https://www.jameco.com/shop/StoreCat...type=jamecoall

Testing MOSFETs
https://www.youtube.com/watch?reload=9&v=gloikp9t2dA

[HKS]

Hermann this is what i measured hope we can use it
Fredrik

R=Right
M=Midle
(IF LOOKING AT THE MOFET SO YOU SEE THE TEXT, LEGS DOWN)


C201a

Pin 1 goes to: Q35R

Pin 2 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 3 Goes to: no connection with MOFET

Pin 4 goes to: Q25M Turn Stop Hazard Lamps.

Pin 5 goes to: Q34M Turn Stop Hazard Lamps.

Pin 6 goes to: Q21M External Lamps

Pin 7 goes to: Q32M Auto Lamps

Pin 8 goes to: Q29M Auto Lamps

Pin 9 goes to: Q35M Power Steering.

Pin 10 goes to: Q31M Auto Lamps__

Pin 11 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 12 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 13 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 14 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

Pin 15 Goes to: Q31R, Q26R, Q29R, Q32R, Q21R, Q34R, Q25R, IC18M, Q28R

pin17 goes to: no connection with MOFET

pin17 goes to: Q26M Auto Lamps



C201C
pin 2 goes to Q__Turn Stop Hazard Lamps. .................................... no connection with MOFET

C201e
pin 11 goes to Q36 ??? Instrument Cluster ..................................... Q36M

C201g
pin 2 goes to Q__ Power Windows .................................................. .. no connection with MOFET
pin 1 goes to Q__ Power Windows ................................................ no connection with MOFET

C201b
pin21 goes to Q__ P93 Battery Junction Box Relays K321 K322 K323 K324 no connection with MOFET
pin14 goes to Q__ Windshield Washer Pump .................................. no connection with MOFET

C201a Pin 1 goes to +12V fuse F2.30 5 amp. An pin 1 +12 does goes to the Source of Q35 the P type MSOSFT
Make sure you use the lowest Ohmmeter scale. You should read a short circuit or 1 to 2 Ohms. You were probably reading a load resistance in Q35 .

I am only interested in the M readings. Middle pin which is the Drain.
Any C201a readings from pin2 to other Q# are Ground.

[HKS]

Fredrik,
Attached is FEM schematic showing switching required for passenger window.

FEM-WindowPasenger C201G-pin1-2-4.jpg

I don't know if switching is done by relays or MOSFETs. Metal Oxide Silicon Field Effect Transistors.
Most all switching is done by MOSFETs.

[Fredrik73]

C201a Pin 1 goes to +12V fuse F2.30 5 amp. An pin 1 +12 does goes to the Source of Q35 the P type MSOSFT
Make sure you use the lowest Ohmmeter scale. You should read a short circuit or 1 to 2 Ohms. You were probably reading a load resistance in Q35 .

I am only interested in the M readings. Middle pin which is the Drain.
Any C201a readings from pin2 to other Q# are Ground.

Ok Hermann
i Will try to measure the resistent instead
/Fredrik

[Fredrik73]

Fredrik,
Attached is FEM schematic showing switching required for passenger window.

FEM-WindowPasenger C201G-pin1-2-4.jpg

I don't know if switching is done by relays or MOSFETs. Metal Oxide Silicon Field Effect Transistors.
Most all switching is done by MOSFETs.

i have measured alot but only get strange values on everything must get help from my friend
the values are pending up and down on the mofets

[HKS]

i have measured alot but only get strange values on everything must get help from my friend
the values are pending up and down on the mofets

Are you trying to measure resistance with +12V power applied to the FEM? Resistance (continuity) is measured with power disconnected.

I am only trying to identify all MOSFET switches (they are switches) by tracing the connector pin number to the MOSFET Drain (center pin) for now.
HERMANN

[Fredrik73]

Are you trying to measure resistance with +12V power applied to the FEM? Resistance (continuity) is measured with power disconnected.

I am only trying to identify all MOSFET switches (they are switches) by tracing the connector pin number to the MOSFET Drain (center pin) for now.
HERMANN

now i have measure and pin 3 have resitance between all mofets center pins.
and the same for pin 4 resistance between all mofets center pin and pin 4
and no powersorce connected

[HKS]

Fredrick,
Are you talking about the 4 pin power connector?
Also, maybe we should continue our FEM investigation by using the TBN private message option.

We can go back to posting for all to see when we have things figured out.
Hermann