Battery for 2001 Passat KEY

If it unlocks the door, the problem may be a weak battery in the key fob, or a problem in the keyless entry antenna or wiring. The key fob itself could be defective or have a bad unlock button. Try the lock button, trunk release button or panic button. If the other buttons work, the problem is a bad unlock button.

Use your key to unlock the door / trunk. If your car starts up; it might just be a connector and / or your battery in your remote. Try the simple / cheaper fix check by checking the connectors leading to the trunk release solenoid.

The transponder is not effective any longer sometimes the battery of the remote is very low which needs to be replaced

Assuming the car battery is ok (if not, buy a male to male cigarette lighter at the auto store and connect to another car until charged enough to unlock the doors...but don't try to crank the ignition!). The trunks won't open if the battery went dead with the alarm set because arming the alarm physically locks the releases.

Sounds like the key code is switched off because you replaced the key fob battery. Try unlocking the car manual with the key in the door lock. Then switch the ignition on to reactive the keyless entry. If this does not work, you might also try pressing the fob unlock button with the key in the door lock until the dash led flashes.

i honestly am guessing,can you turn key to the left from vertical or right from vertical,if so one (left or right)is to lock trunk so you can give your keys to valet parkers....

security module in the trunk ???? There is no security module in the trunk . What light's come on by them self ? Park lamps , headlamps , brake lamps ,turn signals etc.... The module for anti-theft is under the right hand side of the dash . The remote keyless entry module is located in the trunk. Is this the part you hear clicking in ?
Door Lock Control Processor, Electronic NOTE: The electronic door lock control system will not function when the ignition switch is in the RUN or ACC position.
The electronic door lock control processor:

• is located on the LH side of the luggage compartment.
• contains a radio receiver that receives a signal from the keyless entry remote transmitter (15K601) through electronic door lock control processor antenna, and sends the appropriate command to the power door locks, the horn relay, the indicator flasher, or the anti-theft warning system.
• is equipped with a battery backup which holds the programmed code in memory in the event the vehicle battery is disconnected.
• • Doors Do Not Lock or Unlock Using Keyless Entry Remote Transmitter
  • Circuit.
  • Electronic door lock control processor.
  • Keyless entry remote transmitter.
  • GO to Pinpoint Test B .

If you have the keyless entry system, you either have a dead battery in the car, or in your key fob. Regardless, you can gain entry to the vehicle using the emergency key concealed inside your fob. Press the narrow button near the metal end of the fob to separate the parts. They metal piece has a key attached that fits into the lock on the driver's door.

usually after opening the door you can deactivate the alarm by pushing th unlock button or simply insert keyy in ignition and turn it on.

stand at the vehicle and push and hold the lock and unlock buttons till the horn chirps to resync the key fob

I simply opened the bonnet. Connected the battery charge positive to the + feed on the back of the alternator, connected the negative to the body. Turned it on, immediately the interior light comes on. Turn on the ignition press the cabin boot switch and it opens the boot. Charge battery as normal. Easy Peezy