Headlight Washer & Heated Mirror Questions

[Fred Munro]

Hi Scott;

The headlight washers on my S4 pop out under pressure when the pump starts
and retract when the pump stops. The headlight washer pump starts about 1
second after the stalk is pulled, runs for about 1 second, then it times
out. Any more than this and you will go through prodigious amounts of washer
fluid - the headlight washers use a lot.
I would imagine the system on your A4 is similar.

Fred Munro
'94 S4

----- Original Message -----
From: "Traurig, Scott R" <scott.r.traurig at baesystems.com>
To: <quattro at audifans.com>
Sent: Friday, November 30, 2001 5:40 PM
Subject: RE: Headlight Washer & Heated Mirror Questions


> OK, here's where we stand on this subject...
>
> ** Heated mirrors: mystery semi-solved.
>
> I do have the winter package (heated seats, etc.) We don't know the actual
> temperature at which they activate, but list consensus is you can't feel
> them, so I just need to keep an eye on them and see if the frost melts in
> the winter when they are frosty.
>
> ** Headlight washers: truly broken, and the mystery deepens.
>
> Truly broken I'm afraid. I only just ordered the factory manual (on
CD-ugh,
> paper is no longer available-ugh!) and wiring schematics today, so any
help
> would truly be appreciated. Here are the symptoms and diagnostics so far:
>
> All fuses (#3 and #24 if memory serves) are good. With plenty of
> fluid and the lights on, of course :-), when I pull the wiper stalk switch
>
> 1. The windshield sprayers spray and wipers wipe
> 2. One second after that a relay clicks on and voltage appears at the
> terminals of the headlight washer motor.
> 3. One second after that the relay clicks off and there is no voltage
> at the terminals of the headlight washer motor. 2 & 3 happen whether or
not
> the headlight washer motor is hooked up.
> 4. Attaching the headlight washer motor directly to the battery nothing
> happens. The motor coil measures 1.8 ohms.
>
> If the motor is bad, would that kill the relay? I wouldn't think so. I
> assume the headlight washer relay should stay energized from 1 second
after
> the windshield sprayers start until the stalk switch is released. Why is
it
> going off after 1 second? Perhaps I have two separate problems, the motor
> and the relay? Maybe a good starting place is the relay. Which relay is
it,
> and how does the manual say to test it?
>
> Thanks, this list is great.
>
> Scott
> 98.5 A4 1.8TQ