Trying to find whats wrong with my old Fem

[Fredrik73]

[QUOTE=HKS;n1082958]

Fredrick,
The IC18 regulator does not need to see much of a load (relay) to regulate to +5 volts.
Yes, you need to hook it up again to see if it is +5 or +3 volts.
Or, you could test IC18 externally. You just need a +12 v source or a battery. I will look for a drawing showing which pins are +12 input and which pin is the +5 volt output.
If the center pin is ground, that would verify it being a voltage regulator. Measure (Ohmmeter) the center pin to chassis. It should read close to 00.

TO220Regs-l1000.jpgTO220-as-l1600.jpg


P.S. I will try to ID some more of the MOSFET power switches.

I or you need to measure to the center pins of the remaining MOSFETs from a suspect connector pin. Select a pin on a plug (like L Headlamp) and check all the MOSFET center pins looking for continuity (short).

One can easily find all the pins from the schematics. This process of elimination requires only the pins relating to each circuit. Not every pin in each plug/socket.[/QUOTE
Look at the 2002 Service manual Wiring Diagrams.
Page 82-1 shows 4 switches in the Front Electronic Module. The switches are MOSFETS. Connector C201a pins 10,7,17 and 3.

Page 92-2 shows 6 switches. Assigned to several Different connectors.

That makes 10 switches plus the Q35 and Q36. See if you count 12 MOSFETs.
My eyes may be tired. So double check this.

P.S. I only count 10 MOSFETS in my new spare 2018 FEM. So two of the switches must be relays. I see 2 relays in place of the one you show pictured. The original FEM may have had a couple more MOSFETS.
I don't feel like tearing out my old working module soon. The neighbors would hear a lot of Navy cuss words, lasting several hours.
Pix of my old module is the bottom one.
FEM2018.jpg

1W6T-13B525-AJ.jpg
Top shows 10 fingers. One empty and another IC18 leaving 8.
Left bottom 2 are Mosfets others empty.

Good finds those mosfets i Will measure tomorrow of midle leg are ground and of it gives +5volt.
i have only found 11 mosfets Maby another different one on board.
will measure connections and pins also
/Fredrik

[HKS]

Error, in post#30

There are only 10 MOSFET switches in the FEM, including Q35 and Q36.
8 on top row (10 minus Q35 on the right and IC18 on the left) and 2 on left row (5 minus 3 empty equals 2 MOSFET).

I know what I am doing but multitasking and caring for someone 24 hours a day takes its toll.
Hermann
P.S. And, don't forget, there are lots of MOSFET switches in the REM, rear electronic module.

FEM-LtoR-201E_201D_201C_201B.jpg
FEM Connectors L to R:____ C201E 20PIN ________C201D 26PIN _______C201C 12 PIN ___C201B 22 PIN

Also, see C201A-17pin. It is on the left side next to the power plug. Pins 5, 4 and 6 have MOSFET light switches on them including the VAPS power steering circuit switch, pins 2 and 9.

Correction.See post #30 and #31. There is no 82-1 page. Should be 87-1 and shows 4 MOSFETs connector pins on C201A.

[Fredrik73]

Error, in post#30

There are only 10 MOSFET switches in the FEM, including Q35 and Q36.
8 on top row (10 minus Q35 on the right and IC18 on the left) and 2 on left row (5 minus 3 empty equals 2 MOSFET).

I know what I am doing but multitasking and caring for someone 24 hours a day takes its toll.
Hermann
P.S. And, don't forget, there are lots of MOSFET switches in the REM, rear electronic module.

FEM-LtoR-201E_201D_201C_201B.jpg
FEM Connectors L to R:____ C201E 20PIN ________C201D 26PIN _______C201C 12 PIN ___C201B 22 PIN

Also, see C201A-17pin. It is on the left side next to the power plug. Pins 5, 4 and 6 have MOSFET light switches on them including the VAPS power steering circuit switch, pins 2 and 9.

Correction.See post #30 and #31. There is no 82-1 page. Should be 87-1 and shows 4 MOSFETs connector pins on C201A.

Hermann i know you know what you are doing
its me that dont know, im trying to measure in the best way what you tell me.
im a mechanic messing with the electric

[HKS]

Fredrik,
The errors or rather corrections were mine not yours. I had to go back and edit the original post. But there is no way do edit a quotes from an earlier (preceding) post.

To sum it all up, all you need to find which is MOSFETs does what. It is given in the two pages of the manual you have.

In the 2002 Electrical Manual
Page 87-1 shows 4 switches in the Front Electronic Module. The switches are MOSFETS.
Connector C201a pins 10,7,17,3.

Page 92-2 shows 8 switches.
Connector 201c pins 6,2,10
Connector 201a pins 5,4,6
Connector 201b pin 22,11

That makes 12 switches again. Two too many. Or two of the switches are relays.
This may be an error in the manual

[Fredrik73]

Fredrik,
The errors or rather corrections were mine not yours. I had to go back and edit the original post. But there is no way do edit a quotes from an earlier (preceding) post.

To sum it all up, all you need to find which is MOSFETs does what. It is given in the two pages of the manual you have.

In the 2002 Electrical Manual
Page 87-1 shows 4 switches in the Front Electronic Module. The switches are MOSFETS.
Connector C201a pins 10,7,17,3.

Page 92-2 shows 8 switches.
Connector 201c pins 6,2,10
Connector 201a pins 5,4,6
Connector 201b pin 22,11

That makes 12 switches again. Two too many. Or two of the switches are relays.
This may be an error in the manual

hihihi yes i Will look on that
i also think its relays.
i was at my garage today trying to repair my clockspring cable in the steering wheel(later i must buy one)
/Fredrik

[edward301]

When the FEM on one of my T Birds was having issues, I somewhat did what you are doing, I was able to find most
all of the MOSFETs, and was going to replace all of them. One or two are 5v regulators feeding the board.

The FEM is a multi layered pc board, and I decided I did not want to fool with de soldering that many components
and risk damaging the pc board, so I sent mine off for repair, the price then was not that bad.

The OMRON relay markings are custom #s for Ford. You will have to measure the ohms on the relay coil and
see if the relay is 5v or 12v. From there should be easy to find the current relay.

I ran a independent radio service shop for a Motorola dealer for 38 years, and even I did not want to dig that
deep into the FEM.

Wish you well.

[HKS]

When the FEM on one of my T Birds was having issues, I somewhat did what you are doing, I was able to find most
all of the MOSFETs, and was going to replace all of them. One or two are 5v regulators feeding the board.

The FEM is a multi layered pc board, and I decided I did not want to fool with de soldering that many components
and risk damaging the pc board, so I sent mine off for repair, the price then was not that bad.

The OMRON relay markings are custom #s for Ford. You will have to measure the ohms on the relay coil and
see if the relay is 5v or 12v. From there should be easy to find the current relay.

I ran a independent radio service shop for a Motorola dealer for 38 years, and even I did not want to dig that
deep into the FEM.

Wish you well.

Edward,
Lets see if Fredrick can identify, and give us all the (MOSFET switch) transistor assignments. This will be valuable reference material for complaints like VAPS, instrument panel, and headlights not working. That would narrow the repair down to replacing just one transistor for a certain symptom.
In the future, repair places might become scarce and we might have to resort to this repair method. I would recommend cutting the 3 transistor leads and soldering the replacement part leads to the cut off leads attached to the circuit board. Also, I do not recommend the shotgun method of replacing all the MOSFETS.

I will try to identify/recommend the generic/improved replacement transistors.
HKS

[007Cruiser]

Perhaps one of our electronically talented members would do the repairs for a more reasonable price once the problem areas are all identified.

[HKS]

Perhaps one of our electronically talented members would do the repairs for a more reasonable price once the problem areas are all identified.

Correct. That has come to mind also.
HKS

[Fredrik73]

Correct. That has come to mind also.
HKS

yes my goal is to find the part i bet It not expensive to fix a FEM
/Fredrik

[Fredrik73]

Perhaps one of our electronically talented members would do the repairs for a more reasonable price once the problem areas are all identified.

Yes my goal is to find the broken part, I bet its not expensive
/Fredrik

[Fredrik73]

When the FEM on one of my T Birds was having issues, I somewhat did what you are doing, I was able to find most
all of the MOSFETs, and was going to replace all of them. One or two are 5v regulators feeding the board.

The FEM is a multi layered pc board, and I decided I did not want to fool with de soldering that many components
and risk damaging the pc board, so I sent mine off for repair, the price then was not that bad.

The OMRON relay markings are custom #s for Ford. You will have to measure the ohms on the relay coil and
see if the relay is 5v or 12v. From there should be easy to find the current relay.

I ran a independent radio service shop for a Motorola dealer for 38 years, and even I did not want to dig that
deep into the FEM.

Wish you well.

Thank you Edward
maby its crazy but i must try, it would be so nice because so Many have this problem.
i Will try measure on my broken coils tomorrow to see it they are 5v or 12v
/Fredrik

[Fredrik73]

I got answer from omron today, must find another place to send the question


Hello Fredrik This is a PCB component handled by another department here at Omron. I may ask you to check with one of our distributors, TTI, Arrow, Rutronik, Distrelec, Anglia, digikey

[Fredrik73]

Found this in both 12v and 5v
maby right?
4BB9D5B5-4309-41E9-8304-6EEB22A3BC2C.png

[Fredrik73]

C726C9E0-6688-4897-9D5D-E046F036ADB6.png