Random actuation of rear diff lock

[Mikea2769 at aol.com]

In a message dated 1/25/2006 8:48:31 AM Eastern Standard Time,  
quattro-request at audifans.com writes:

To:  quattro at audifans.com
Message-ID:
<28628541.1138190531269.JavaMail.root at vms070.mailsrvcs.net>
Content-Type:  text/plain; charset=us-ascii

My 88 90Q rear diff lock lights up for no  currently known reason.  

OK listers, seen this  before?



On my 5000 this was caused by a faulty one way valve which allowed  vacuum to 
cause the rear diff to kick in. The valve was on one of the  vac. lines from 
the diff lock switch. Get a parts diagram of the switch and  lines and it 
should be there.
 
 
Mike  Aiello
87 5kcstq, 318k miles, orig.  owner