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Key fob battery replacement

Discussion in 'Technical Archive' started by Bromsgrove Defender, Nov 28, 2013.

By Bromsgrove Defender on Nov 28, 2013 at 9:50 AM
  1. Bromsgrove Defender

    Bromsgrove Defender Well-Known Member

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    Please note this is for battery replacement only i.e. the buttons don't work but the car will start.


    If your fob will not start the car it needs more than a new battery.

    Also a dead fob will need at least 15 minutes recharge time.


    I don't know how you can know if your good at taking stuff apart but hopefully you'll be able to assess how good the outcome will be of your own attempts seeing what was involved.

    This is the battery you need :rolleyes: PANASONIC - VL2330-1HFE - BATTERY, RECH LITHIUM 2330

    [​IMG]

    I'd bought this one before opening the fob :doh: So get the right one It'll be easier ;) Still the same number though so beware

    [​IMG]


    Ok first up a list of tools I used
    Left to right Screwdriver small flat blade, long nosed pliers, solder sucker, solder, soldering iron, side cutters, spare pair of hands hobby vice, super glue

    [​IMG]

    Press the black tag and remove the key

    [​IMG]

    With the buttons facing you insert long nosed pliers into to key recess

    [​IMG]

    Now insert the screwdriver into the key recess too and lever apart

    [​IMG]

    Just when it gets to the point where you think this is gonna break. It will pop apart........ hopefully :eek:

    Yup not only is that plastic thing holding the battery. it is also soldered to the PCB

    [​IMG]

    Now comes the tricky bit :(

    NB With extreme caution
    DONOT bend the Circuit board and DONOT leave the soldering iron on any longer than absolutely necessary to remove the solder. Use the side cutters to shorten the tabs on the back of the circuit board. Makes desoldering much quicker/easier ;)

    Here

    [​IMG]

    and here

    [​IMG]

    Once the solder has been removed insert small flat bladed screwdriver here and lever the battery up out of the casing again be very careful not to bend the circuit board.

    [​IMG]

    I had to bend the thin tab back like this. But if you've bought the right battery you'll be fine :rolleyes:

    [​IMG]

    I removed the battery holder to make sure the tabs were long enough to locate into the PCB but with the right battery you wont need to

    [​IMG]

    Then resolder the tabs

    [​IMG]

    Put the fob back together WITHOUT glue so you can see how much you need to bend the back so that it meets the front ;)

    When your happy that it'll go back together and look ok use just a couple of blobs of glue, don't go round the whole fob in a continuous bead you might want to get back into it one day ;)

    :welcome2:
     
    Hippo likes this.
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Discussion in 'Technical Archive' started by Bromsgrove Defender, Nov 28, 2013.