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The key fob will need to be reprogrammed to the vehicle since when the battery was replaced in the key fob, the key was reset. This is why nothing is working with the key fob. After replacing the battery in the key fob remote, you will need to reprogram the remote to the vehicle
If you have a key on the FOB it ought to unlock the doors or rear cargo area manually. A slim jim can sometimes be used or a locksmith can bring master keys to unlock the doors. Some autoclubs and insurance pay for this.
If you have a trailer plug at rear or van, you would need a wiring diagram if the outlets are not molded into the cover of the wiring plug. If you find such a diagram you should find that there is a power terminal in the plug. Connect a power wire to this 1 terminal and ground the other to the bumper or some place close. While you have this connection use your FOB and see if it unlocks.
Some autoparts stores have testers for your FOB to see if that battery is your problem and not the van.
More likely than not, you have the famous broken solder joint(s) at the coil inside the FOB...if that is fine and all solder joints look fine , then you had best get MB, or a good Mercedes Independant garage, to check the EIS and make sure it sees the key
If you take the VIN number to your local Chevrolet dealer parts department, they have the key codes. If it has electronic access locks, they can order you a new fob for it but they are expensive.
you have to get it to open in order to fix it. So unlock it manualy by climbing in and pulling up on the fob that sticks out... you may need to use a screwdriver to grip it...
Once open , take the panel off and inspect the locking mechanisms cotrole rods. They are held on by plastic clips and bind on occassion.
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