Power seat problem

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

lou - 19 Oct 2005 14:55 GMT

The driver's side power seat on my 1995 Ford Crown Vic won't go
forward. It will go backward, but not forward. There is no obstruction
under the seat. Is this just a motor problem?

Reply to this Message

Lawrence Glickman - 19 Oct 2005 15:09 GMT

>The driver's side power seat on my 1995 Ford Crown Vic won't go
>forward. It will go backward, but not forward. There is no obstruction
>under the seat. Is this just a motor problem?

Okay, you know this is a DC motor, and you get it to spin in one
direction by having +/-, and spinning in the opposite direction by
reversing polarity to -/+.

Whatever is reversing the polarity ( a double pole double throw switch
addressing a diode bank ) is most likely responsible for this problem.
My guess is you will find a defective diode on a small PCB that the
seat switch attaches to.

Lg

Reply to this Message

Spud Demon - 19 Oct 2005 21:35 GMT

Lawrence Glickman <Lawrence_Glickman@comcast.net> writes in article <5pkcl1t58b0n5n3ccsfp62o7trsq3e4el9@4ax.com> dated Wed, 19 Oct 2005 09:09:22 -0500:

>>The driver's side power seat on my 1995 Ford Crown Vic won't go
>>forward. It will go backward, but not forward. There is no obstruction
[quoted text clipped - 3 lines]
>direction by having +/-, and spinning in the opposite direction by
>reversing polarity to -/+.

I'm with you so far. It's probably the switch.

>Whatever is reversing the polarity ( a double pole double throw switch
>addressing a diode bank ) is most likely responsible for this problem.
>My guess is you will find a defective diode on a small PCB that the
>seat switch attaches to.

I don't understand why you'd need a diode if you had a DPDT switch reversing
the polarity for you.

-- spud_demon -at- thundermaker.net
The above may not (yet) represent the opinions of my employer.

Reply to this Message

Lawrence Glickman - 19 Oct 2005 22:52 GMT

>Lawrence Glickman <Lawrence_Glickman@comcast.net> writes in article <5pkcl1t58b0n5n3ccsfp62o7trsq3e4el9@4ax.com> dated Wed, 19 Oct 2005 09:09:22 -0500:
>>
[quoted text clipped - 15 lines]
>I don't understand why you'd need a diode if you had a DPDT switch reversing
>the polarity for you.

I don't know what is in the control unit. I am just guessing.

The electrical systems in today's automobiles are NIGHTMARES with your
eyes wide open. If you can fix this problem yourself, pat yourself on
the back.

Some manufacurers do crazy things with design, to save a penny here,
and save a penny there. You can almost be assured they are taking the
cheapest way out when it comes to specifications, even when they build
for the military.

Lg

>-- spud_demon -at- thundermaker.net
>The above may not (yet) represent the opinions of my employer.

Reply to this Message