HI guys - here's the procedue (it was posted by somebody on the 155.com forum):
First ensure that the alarm is turned on at the glovebox.
1. Press the button on the Rx for approx 2 secs. The LED should flash for
the whole time you hold the button.
2. Release the button. After approx 2 secs the LED should flash once. This
is a request for the first digit.
3. Press the button the number of times corresponding to the first digit, ie
if the first digit is 4, then give 4 presses. Every press should cause a
4. Approx 2 secs from the last press, the LED should flash again to request
the second digit.
5. Continue in the same way for the other 3 digits. If a digit is 0 then
don't press at all, just wait for another request flash.
6. Having entered all 4 digits, the LED will either stay oncontinuously
meaning that either there has been an error entering the code, or the code
is incorrect. Or the LED will flash, meaning that the code is good.
7. At this point if the LED is flashing, hold the rx button down and press
the tx button.The rx LED should light continuously if the code has been
8. There is a country setting procedure that follows but I'll omit this as
it defaults to EEC so don't do anything.
9. The rx LEd should now flash 6 times to show all is OK. If you get 18
flashes start again from point 1.
10 Repeat for key 2.
If you do not have the correct code, check what the National Security Agency
have on record, (that the sticker you should have on the windows, or a
dealer can check for you), as they are given all the key and immobiliser
codes at the time of importation.
If none of the above works at all, then you are looking at a new roof rx
(£90) and 2 or more new keys (£50 ea) plus fitting and programming.
As for the code location - I don't know - I don't have mine so I'm stuck with one key, and I think as atated above, the only way to fix this is with a new receiver unit