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#2084345 - 07/01/10 09:03 PM Multi-Function Switch Testing
enslow Offline
Over the Hill

Registered: 04/06/02
Posts: 1567
Loc: Vancouver
This article can also be viewed in the Bdoy of Knowledge - MFS (Turn Signal/Wiper Switch) testing -by enslow -d




***For 2002 and older vehicles only -d

At least one of you on this forum have replaced the Multi-Function Switch on your Panther assuming that was the problem, only to find that it wasn't. Here is an article that will help you decide whether to go out and buy a new MFS, clean your existing switch, or take another look at your wiper motor instead.

Symptoms: erractic wiper operation, wipers swipe or park unexpectedly.

Tools needed:
-3/8 or 1/4" ratchet wrench
-3/8 or 1/4" short extension
-10 mm socket
-small crescent wrench
-No. 2 Phillips head screwdriver
-small Allen Key or similar small straight probe
-20T torx driver
-medium-large blade screwdriver
-volt/ohm meter
-alligator clips

Testing the MFS

Remove MFS
1. Disconnect the negative battery terminal.
2. Remove LH and RH trim molding.
---See 1st and 2nd images
3. Remove the 3 upper and 2 lower 10mm bolts from knee bolster cover.
---See 3rd image.
4. Position the tilt steering to the lowest position and remove the tilt lever using a small crescent wrench.
---See 4th image
5. Remove the 4 shroud screws with a No. 2 Phillips head screwdriver.
---See 5th image

Hang on, more to follow. I'm limited to 5 images....


Attachments
1 remove LH trima.jpg

Description: Removing LH trim molding.

2 remove RH trima.jpg

Description: Removing RH trim molding.

3 Remove knee bolster covera.jpg

Description: Removing 10mm bolt from knee bolster cover. There are a total of 3 on the top, 2 underneath.

4 Remove tilt levera.jpg

Description: Removing Tilt Lever using the crescent wrench.

5 Remove shroud screwsa.JPG

Description: Shows locations of 3 shroud screws. The 4th is located on the RH side near the back of the shroud.




Edited by dRock96Marquis (03/13/12 11:46 PM)
_________________________
Testing the multifunction switch (does NOT apply to 2003+)
Testing the MAF
Digital Cluster Repair
Stalag's Coolant Write-up


Enslow ...graemlin waving canadian flag...
'92 Grand Marquis, M75 (sold 2019 after 22 years)

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#2084354 - 07/01/10 09:12 PM Re: Multi-Function Switch Testing [Re: enslow]
enslow Offline
Over the Hill

Registered: 04/06/02
Posts: 1567
Loc: Vancouver
...MFS testing continued...

6. Remove the lower shroud.
---see 1st image
7. Remove the lock cylinder. Turn the ignition to Run, insert the Allen Key or probe as indicated in the image, the wiggle and pull the lock cylinder straight out.
---see 2nd image
8. Remove the upper shroud. Place the gear shift to D or 1, wiggle the upper shroud from the left side. Return the shift lever to P and remove the upper shroud.
---see 3rd image
9. Remove the 2 20T screws from the MFS.
---see 4th image
10. Remove the 2 electrical connectors using the large blade screwdriver. There are lock tabs on both sides of these connectors. Don't force them out all at once or you can break the lock tabs.
see 5th image.


Attachments
6 Remove lower shrouda.jpg

Description: Removing lower shroud.

7a Remove lock cylindera.jpg

Description: Removing lock cylinder.

8 Remove upper shrouda.jpg

Description: Removing upper shroud. Start from the left side with the vehicle in D or 1, then return to Park.

9 Remove MFSa.jpg

Description: Remove MFS using 20T torx.

10 Remove Electrical Connectora.JPG

Description: Remove 2 electrical connectors. Remember there are lock clips on both sides of each connector. Work them off carefully if you don't want to break them.


_________________________
Testing the multifunction switch (does NOT apply to 2003+)
Testing the MAF
Digital Cluster Repair
Stalag's Coolant Write-up


Enslow ...graemlin waving canadian flag...
'92 Grand Marquis, M75 (sold 2019 after 22 years)

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#2084365 - 07/01/10 09:26 PM Re: Multi-Function Switch Testing [Re: enslow]
enslow Offline
Over the Hill

Registered: 04/06/02
Posts: 1567
Loc: Vancouver
Last part of MFS testing...

Resistance checks for the Multi-Function Switch:

Refer to image below for the following resistance checks.
1. Wiper switch resistance check:
Terminals 589 and 993

Position_______Resistance (k ohm)
OFF___________47.6
INT___________11.33
LO____________4.08
HI____________0 (closed circuit)

2. Interval Resistance check:
Terminals 590 and 993

Resistance (k ohm)
103.3 (longest delay position)
80
65
50
35
20
3.3 (shortest delay)

Check to see the resistances do not spike as you wiggle the switch in any of position.

If resistances are within 5 about ohms and they regularly decrease from longest to shortest delay, the switch is probably good.

If you see spikes as you wiggle the rotary interval switch, you could try cleaning the contacts. I'll post a procedure for cleaning those contacts later.

If resistances indicate open circuits (very high resistances) or closed circuits where there shouldn't be any, you could try dissembling the entire switch body and locating the damaged wires. It is possible, but you will need a lot of patience! I've got images of that repair also, but I don't know if anyone would be interested in it.


Attachments
terminals.jpg


_________________________
Testing the multifunction switch (does NOT apply to 2003+)
Testing the MAF
Digital Cluster Repair
Stalag's Coolant Write-up


Enslow ...graemlin waving canadian flag...
'92 Grand Marquis, M75 (sold 2019 after 22 years)

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