[928uk] Mirror controller question

[ERIC COOLEN]

Update as of today: Spare mirror controller unit finally arrived and after
a bit of playing in the garage in the freezing cold, both mirrors work
again including memory facility.

Having opened the old unit, without a circuit diagram I´m none the wiser as
to which part on the PCB would have failed. Anyway one for the bi then.

Regards,

Eric
On 23 January 2012 09:17, ERIC COOLEN <eric.coolen at ntlworld.com> wrote:

> Hi,
>
> It's the mirrors with memory.
>
> I have indeed already tried the memory-return of the mirror, and again, no
> joy when it's supposed to move the mirror up or left. As mentioned I have
> already checked the change-over switch, next up will be the controller to
> check. just need to get a good one first.
>
> Regards,
>
> Eric
>
>
> On 22 January 2012 23:31, Paul R. Smith <smiffypr at clear.net.nz> wrote:
>
>> With or without memory?
>>
>> If with memory, can returning to any of the memory positions cause the
>> mirror to move up or left?
>>
>> If the driver's side moves up and left, that will discount the joy-stick
>> switch.
>>
>> The wiring and motors are the same for up and down or right and left, so
>> it can't be there.
>>
>> So it looks like it could be the mirror change-over switch (easy to
>> check again as the wiring diagram shows the internals), or a fault in
>> the mirror control unit, which would most easily be checked by swapping
>> with a known good one.
>>
>> Smiffy
>>
>> On 23/01/2012 12:18, ERIC COOLEN wrote:
>> > Hi,
>> >
>> > It´s a 1990 S4.
>> >
>> > Already checked the joystick itself and the switch (back in September
>> > 2011 when I first started investigating the passenger side mirror, but
>> > then got side-tracked doing other things), cleaned contacts, both
>> > joystick and switch work fine as far as I can tell and measure.
>> >
>> > Regards,
>> >
>> > Eric
>> >
>> > On 22 January 2012 22:39, Paul R. Smith <smiffypr at clear.net.nz
>> > <mailto:smiffypr at clear.net.nz>> wrote:
>> >
>> >     First of all WHAT YEAR?
>> >
>> >     But from what you say, I would suspect the joystick switch. Try
>> >     squirting some WD-40 into it and giving it a really good circular
>> >     waggle.
>> >
>> >     Smiffy
>> >
>> >     On 23/01/2012 11:24, ERIC COOLEN wrote:
>> >      > Hi folks,
>> >      >
>> >      > Reasonably nice temperatures out there today, so off the the 928
>> >     I went
>> >      > to tackle 4 niggles on the passenger side door.
>> >      >
>> >      > One of those niggles is that the door-mirror only moves down and
>> >     right
>> >      > when adjusting. Measured for continuity in the wiring loom from
>> >     mirror
>> >      > to the yellow multi-pin connector attached to the inner door
>> >     skin, and
>> >      > all is fine.
>> >      >
>> >      > Then measured at said yellow connector the voltages to the mirror
>> >     motors
>> >      > (loom to mirror not connected) when adjusting the mirror using
>> the
>> >      > joystick on the driver´s side.
>> >      >
>> >      > When trying to adjust the mirror down and right voltages are as
>> >     follows:
>> >      >
>> >      > Right adjust:
>> >      > Voltage between BL/RE and WT/GR connectors: -1.57V
>> >      > Voltage between BL/RE and BK/BL connectors: -8.95V
>> >      >
>> >      > Down adjust:
>> >      > Voltage between BL/RE and WT/GR connectors: -1.57V
>> >      > Voltage between BL/RE and BK/BL connectors: -8.95V
>> >      >
>> >      > Adjusting left or up does not work:
>> >      >
>> >      > Left adjust:
>> >      > Voltage between BL/RE and WT/GR connectors: 0.65V
>> >      > Voltage between BL/RE and BK/BL connectors: -0.09V
>> >      >
>> >      > Up adjust:
>> >      > Voltage between BL/RE and WT/GR connectors: 0.65V
>> >      > Voltage between BL/RE and BK/BL connectors: -0.09V
>> >      >
>> >      > I don´t think the fault lies in the loom from the controller to
>> >     the door
>> >      > itself, everything on the door side looks fine. Other features
>> of the
>> >      > passenger door (central locking, memory switch) work.
>> >      >
>> >      > Could this be a fault in the actual mirror controller?
>> >      >
>> >      >
>> >      > Regards,
>> >      >
>> >      > Eric
>> >      >
>> >      >
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