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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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How it works.Views : 419 Replies : 4Users Viewing This Thread : |
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Jul 14th, 2019, 12:38 | #1 |
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How it works.
HI,
My V40 refuses to start now and than.At that moment I can see the crossed out car icon lights up. Now I try to understand how the immobilizer works. Suppose It works as follows: Key sends a signal that is picked up by the antenna around the contact. If it is the right key the immobilizer recieves the right code and sends a OK code to the cpu witch release the starting relay ant the motor crancks.Am i right? If I want to change the immobilizer but keep the key and antenna does this work? |
Jul 14th, 2019, 17:33 | #2 | |
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Jul 14th, 2019, 17:57 | #3 | |
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Last Online: Mar 20th, 2024 18:26
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The car knows what key is permitted to be used. New keys can only be added by Volvo. Second hand keys cannot work. You cannot change immobiliser and keep same keys.
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Jul 19th, 2019, 11:18 | #4 |
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Last Online: Apr 12th, 2024 12:12
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Where is the serial number located cpu or immobiliser?
Is it not so the recieved code in the immobiliser is send to the cpu where it is compared with the code stored there . If it is the right one the engine is allowed to start. That way the immobiliser only activate the key and sends the recieved key code to the cpu .So you can change this box. If you use an other key the CPU must go with it to start. |
Jul 19th, 2019, 11:27 | #5 | |
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