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recovering
codes on the SC 705 & 905
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 Ian
Tew gives us some great information on how to get to the 850 radio code
if your conventional enquiries get you nowhere! |
I recently bought an 850 saloon from a
local garage, on collection the owner informed me that there was a problem
with the radio and he did not have the security code but he would contact
the previous owner to let me know (he never called). I contacted the main
agent who said that with proof of ownership and the registration details
that they would find the code for me via the Volvo database. The code they
gave me did not work and they suggested that the radio had been exchanged
or replaced. After some research a solution was found
Remove the radio from the car and remove the screw at the rear of the top plate. Gently prise the top plate up and remove. Release the four screws (indicated by yellow arrows in Figure 1) and gently prise out the two cassette connectors, also indicated. The transport mechanism can now be lifted out.
A matrix of twelve diodes will be visible on the main PCB (Figure 2) the diodes determine the radio security code.
Using the software programme (download
below), tick the appropriate boxes to indicate the diodes present and leave
blank the boxes where the diode has been removed. Press the calculate button
to reveal the radio code.
Two software programmes are included, one
for the CR905 radio cassette and the other for the CR705 radio cassette
model.
Hope this information will benefit your members Ian Tew 850 owner (UK)
Download Software Click (decode.zip, 357 Kb zipped archive file,
containing 2 executables,
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Thanks very much
to Ian for sharing
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If you have any experiences, facts, hints comments or data that you think might be useful on the site, please
and I will post it, with an acknowledgement of your contribution (if you so wish).
Figure 1.
Figure 2.