A diversity of opinion - SRS diagnostics

My 1995 E200-124 has just been tested by a Mercedes-Benz dealer and these are the results.
1. Star Diagnosis test: no readings. 2. Analogue diagnostic test: no readings.
3. Handheld scanner: complete readings, except for SRS control unit.
Therefore, the dealer is maintaining that the fault must lie with the control unit. This will cost roughly UKP 750.00 (USD 1400.00) to rectify.
The independent specialist I have been using couldn't trace the source of the fault, using test methods 1 and 3. During their investigations, they swapped my control unit with their garage 'loaner' (an older E300) and claimed that my control unit worked perfectly well in the other vehicle, i.e. the SRS light didn't appear.
So, on the one hand, the dealer claims that I need a replacement control unit whilst the independent specialist says otherwise. Can anyone explain this diversity of opinion?
TC
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

IMHO, more important than your control unit working in the loaner is what happens if they use the control unit from the loaner in your car.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Exactly the same result - the SRS warning light didn't appear.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
(Second attempt at posting)
It worked normally, i.e. no warning light appeared.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wrote:

So they put a different control unit in your car and the light went out? If so then I'd say it was a pretty safe bet that you need a new control unit...
--

Lettuce spray for whirled peas...

Reply to usenet[at]miknik[dot]co[dot]uk
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.