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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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How keyfobs work.Views : 454 Replies : 2Users Viewing This Thread : |
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Mar 5th, 2019, 09:55 | #1 |
Junior Member
Last Online: Apr 10th, 2024 15:35
Join Date: May 2016
Location: Essex
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How keyfobs work.
Hello, I have just read SwissXC90's really interesting explanation of how Volvo keyfobs work:
The process of adding a key requires that ALL keys be present When I bought my V50, a couple of years ago, I was given two keys: Key A and Key B. Both keys could fire up the car on but only Key A could ever unlock/lock the central locking. My dealer asked me to drive to my nearest Volvo garage as they claimed that Key B somehow needed to be "synced" back to the car - something I though was a bit odd at the time. After waiting for an hour, I was told that the fob could not be synced and that they would have to be given a new replacement fob. I was told to come back a week later and after another hour wait, I got the car back with a brand new fob - Key C. The garage also gave me back the broken Key B as a spare, as it could still be used to use the car in an emergency, despite setting of the alarm first. In light of the explanation above, am I correct in thinking that it is simply the active rolling code in Key B that broke and therefore the garage were never going to be able to fix it in the first place? Last edited by elsmandino; Mar 5th, 2019 at 09:57. Reason: Additional information |
Mar 17th, 2019, 13:10 | #2 |
Clueless
Last Online: Yesterday 14:52
Join Date: Apr 2013
Location: Wrotham
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I bought a '04 V50 yesterday that has exactly the same issue. Key A works fine, key B will start the car but the key fob won't unlock the car even with a new battery.
I also noticed that if I pressed the buttons on key B (which seemed to do nothing), and then pressed the buttons on key A they wouldn't work for about 20 seconds afterwards. I am going to call a local locksmith to create key C as soon as I have time.
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Current Volvo's: S40 1.8 (55) & V50 2.4i (04) Past Volvo: S40 1.8 ('97/R) & 240 GLE ('76/R) |
Mar 17th, 2019, 14:03 | #3 |
Premier Member
Last Online: Mar 20th, 2024 18:26
Join Date: Jan 2016
Location: Cross Country
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Sounds like Key B has a remote control faulty transmitter. Or a flat battery. Or bad battery contacts There are companies that repair them.
If the key still starts the car then the immobiliser chip is still recognised.
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