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key fob will lock but won't unlock

  • 23-06-2013 7:10am
    #1
    crazygeryy
    Closed Accounts Posts: 3,065 ✭✭✭


    toyota avensis 99.as the title says the fob will lock it but not unlock it.its not the batteries in the fob,i changed them.it was working fine up until yesterday morning.
    any ideas?


Comments

  • #2
    Avns1s
    Registered Users, Registered Users 2 Posts: 3,423 ✭✭✭Avns1s


    Try this:

    Sit in drivers seat
    1. Open drivers side door without the key in the ignition
    2. Put key in ignition - turn from off to on, wait 10 sec
    3. Push lock or unlock button twice, you should hear the sound of the lock mechanism.

    Both buttons should now work.


  • #3
    crazygeryy
    Closed Accounts Posts: 3,065 ✭✭✭crazygeryy


    Avns1s wrote: »
    Try this:

    Sit in drivers seat
    1. Open drivers side door without the key in the ignition
    2. Put key in ignition - turn from off to on, wait 10 sec
    3. Push lock or unlock button twice, you should hear the sound of the lock mechanism.

    Both buttons should now work.


    thank you so much. it worked a treat. any idea what happened or why?


  • #4
    Avns1s
    Registered Users, Registered Users 2 Posts: 3,423 ✭✭✭Avns1s


    Not sure to be honest but it's power related. I've found it happen when the battery goes low, and also perhaps the key has been sat on or otherwise kept with one of the buttons depressed for a period. Chances are you'll need that fix again in the future!


  • #5
    crazygeryy
    Closed Accounts Posts: 3,065 ✭✭✭crazygeryy


    Avns1s wrote: »
    Not sure to be honest but it's power related. I've found it happen when the battery goes low, and also perhaps the key has been sat on or otherwise kept with one of the buttons depressed for a period. Chances are you'll need that fix again in the future!

    I'll keep it on file ;-) thanks again.


  • #6
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    Probably re-syncing the rolling code(s) in the key / vehicle. It probably doesn't look at the rolling code when locking, just for the unlock operation. If the key fob keeps getting pressed it will keep incrementing the rolling code, if the car is out of range and it gets pressed more times than the look ahead window in the vehicle software, the vehicle won't open. Can sometimes happen if little ones play with keys...


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  • #7
    Avns1s
    Registered Users, Registered Users 2 Posts: 3,423 ✭✭✭Avns1s


    Not sure about this DublinDilbert to be honest. Reason being that the second key will work when one fails, even if it's been away from the car for a year or more.

    I could always relate it to a weak battery.

    Not saying you're wrong by the way. Perhaps there are several reasons for it happening because it's damn common.


  • #8
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    Yea second key will have its own rolling code, which is different. It could well be a software bug in the ecu that's messing up its copy of the rolling code. I've never done any software on a Toyota, but they are all quite similar.


  • #9
    joujoujou
    Registered Users, Registered Users 2 Posts: 13,971 ✭✭✭✭joujoujou
    Unregistered Users


    DublinDilbert wrote: »
    Yea second key will have its own rolling code, which is different. [...]
    I confirm that.

    In addition, ECU is capable to store up to 4 remotes. You can wipe them off and store other ones as well. :)


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