First you need to be 100 sure that the key fob is the culprit.
Power door lock module jetta.
The door lock module is attached to the inside of the carrier panel and is also secured to the edge of the door by the two 8mm triple square bolts in the picture above.
As you can see from the scan the rear left passenger door module has no communication.
The remote does not work to lock or unlock the doors.
The actual door control module is built into the power window motor in each door.
If you use the key in the door handle it locks all 4 doors but immediately unlocks them.
If your key fob fails to lock or unlock your car all you need to do is to replace its battery.
Unable to open windows via switches or key in the door handle.
The part number to rule this out horn going off does sound like a door latch module that is causing your problems.
If you remove the carrier panel and door lock module from the door you ll see the following.
I have replaced the door module i did it about a month ago along with the right side module.
Go into your jetta and play around with the power lock switches.
It may mean the wrong door lock module was installed like from a gti or beetle instead of a front door latch from a jetta.
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The trunk release switch in the door panel does not work.
The power windows sunroof door locks do not work.
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If the power locks seem to be working just fine from within the car then you need to replace your key fob battery.
The door lock module is indicated by the red arrow.
2008 jetta 2 5 yes i know this is a common issue i just couldn t find anything similar.
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If the power window motor looses power all door functions will go dead.