rainer_lange1
Prisma Anti Theft Alarm Error
Summary of the thread
A 2019 Chevrolet Prisma experienced an anti-theft alarm issue, possibly due to an immobilizer or power failure to the alarm control module. A similar problem in another vehicle was caused by incorrect coding of the alarm system, which was sending erroneous signals to the indicator lights. The solution involved diagnosing the alarm control module through the car's diagnostic port and recoding the system, which resolved the issue.
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4 comment(s)
rainer_lange1 (community.author)
When you say 'coded to activate optical locking,' can you explain that a bit more? How did you even figure that out?
richard_walter3
The alarm system module was sending incorrect signals, trying to use the indicator lights in a way that caused a system error, disabling the alarm. The repair shop diagnosed it by interrogating the alarm control module using the car's diagnostic port. I advise you do the same.
rainer_lange1 (community.author)
Okay, that makes sense. Thanks, I appreciate the advice. I took it to a workshop. Turns out you were spot on. They did some recoding and it cost me 45€, but it is solved now!
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CHEVROLET
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PRISMA
richard_walter3
I had a similar problem with my 2017 Opel Astra. Same symptoms: error stored and alarm system inactive. It was caused by the car's alarm system being coded to activate the optical locking (indicators) when it shouldn't. Have you checked for that?