I got fed up of the service alarm mssg , today I pulled the alarm module from the wheel well, battery leaked on the board , looks to be toast.

I would prefer to leave the alarm out, will the missing alarm module affect any other systems? I heard the sunroof will not work but it does work.

I was playing around with vida, trying to learn how it functions.
I have a fault code that has just come on, ECM 928C (cruise control).
IS this related to the alarm?
I have cleared the code but not driven it yet.
The cruise control always worked in the past, just wondering if I did something in vida or if its connected to the alarm module not being installed.

Any fault code that can turn on the check engine light will disable the cruise control.

The ECM 928C is an error from the CEM, which is a buss connector from all of the computers to the engine computer.

Did the removal of the security module cause this? Possible. Also possible is that the CEM really does have an error. I would be surprised that the removal of the security module didn't cause more problems.
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Keeping it running is better than buying new

Ahh, another tidbit of volvo info, thanks for that, it probably explains the code.
I found acid on the circuit board, tooth brushed it with water/baking soda, then dried it. Soldered new power wires to the underside of the board and used 2 NIMH phone batteries instead, mounted them remote from the box.
Reinstalled it all and the dash warning went away.
Then unplugged it and the warning came back, so it seems ok.

Probably won't last long term due to the acid damage on the board but I know how to get in there now.

Thank you for your knowledge, I pay attention.