P38A Complete failure of window regulator and mirror (switch pack)

Datatek · 2025-06-12T16:58:59+0100

Frank_38 said:
...but how likely is it that all contacts in the switch pack will fail at the same time?

I've watched this video but I don't think it's my problem....

not a single button on the switch pack works. When it worked briefly, all the buttons worked.

Unlikely.

Frank_38 · 2025-06-12T17:04:03+0100

Datatek said:
Do the interior lights operate? F1 feeds the switch pack but fuses F2; F9; F12 and F22 are also involved.
A bad earth for the centre switch pack will kill all the functions.
View attachment 342998
Do the mirrors adjust from the switch pack?
Have you checked that you have 12 volts at the switch pack between pins 1 & 6 of the connector?

no, everything is dead on the switch pack.
it must be the fuse - the first one is also responsible for the switch pack.....if I understand correctly...

Datatek · 2025-06-12T17:11:25+0100

Frank_38 said:
no, everything is dead on the switch pack.
it must be the fuse - the first one is also responsible for the switch pack.....if I understand correctly...

No power at the switch pack, so have you checked from pin 1 to some metal part of the car to check if it's a bad earth? If that shows no power, take a wire from pin 1 of the switch pack connector to the battery positive, with the ignition in position 2 see if the switches work.
If they do, it's either a problem with the fuse connections or a broken wire to or from the fuse.

Frank_38 · 2025-06-12T17:15:09+0100

yes, that sounds absolutely conclusive. i'll check it in great detail tomorrow!

Datatek · 2025-06-12T17:29:26+0100

I assume that you are checking for power with the ignition in position #1 or #2.

pwood999 · 2025-06-12T17:59:10+0100

Frank_38 said:
Good evening everyone,

I have put everything back together again today.
I also ordered new fuses and replaced them today.
The complete switch pack is still without function.

I mean, what should I do now?
The cable from the switch pack is fixed - I've already checked that.
The fuses are also all working.
The problem is definitely with
the first fuse in the box, I'm sure of that.

Summer is here and I can't open a single window, not even the roof.

If I now had the nanoncom - what would it show me? Would the fault be localised immediately - 100%?

I'm a bit at a loss with regard to the problem.
Thanks!!!

Nanocom also shows BECM inputs including the window switches. That together with the ability to activate outputs to test the windows & locks means you can nail down where the fault is.

P38A Complete failure of window regulator and mirror (switch pack)

Datatek

Well-Known Member

Frank_38

Active Member

Datatek

Well-Known Member

Frank_38

Active Member

Datatek

Well-Known Member

pwood999

Well-Known Member

Similar threads