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Keyless entry system, both key fobs are not working?

Tiny
SBMISRY
  • MEMBER
  • 2010 VOLKSWAGEN JETTA
  • 2.5L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 151,105 MILES
Neither of my key fobs work now. I never had any issues before. I'm thinking either a fuse or the receiver needs to be replaced. Anyone have knowledge of this and where to find the receiver location? Fuses to check if there is any for this? Thanks
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Friday, December 8th, 2023 AT 9:14 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hi,

Do you mean the keyless entry isn't working but the vehicle still runs? Let me know. If it is only the keyless entry, have you replaced the batteries in the key fob?

If the battery is good, try resetting the fob. To do this, simply remove the battery in the key fob for a few minutes and then reinstall it.

Let me know.

Joe
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Friday, December 8th, 2023 AT 10:00 PM
Tiny
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Yes, I had one for at work with me the other was 45 miles away at home. Neither fobs will work. I have replaced batteries in both units. Haven't tried pulling batteries yet from both units to reset.
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Friday, December 8th, 2023 AT 10:04 PM
Tiny
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Hi,

If you replaced the batteries, you already reset them. Is it just the keyless entry? Also, let me know if you have a scan tool that can scan the can-bus.

Let me know.

Joe
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Friday, December 8th, 2023 AT 10:38 PM
Tiny
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I have an Autophix scanner. But I'm not sure if that's a good enough scanner. It isn't picking up any codes.
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Saturday, December 9th, 2023 AT 7:13 AM
Tiny
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Hi,

If it is a basic scan tool, it won't pick up codes related to this. It is more than likely designed for powertrain codes only.

By any chance, could you get your hands on a scan tool that can scan the can-bus?

Joe
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Saturday, December 9th, 2023 AT 10:34 PM
Tiny
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I managed to scan the central locking system, pulled two codes. B122F29 drivers side contact switch, and code B122D29 lock unit for central locking system implausible signal.
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Monday, December 11th, 2023 AT 9:37 PM
Tiny
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Hi,

Based on the codes, I suspect the door lock control module has failed. They are known for a micro switch internally to fail.

The driver's door module is integral to the window motor regulator. See pics below.

If this is to be replaced, the new components need to be coded to the vehicle.

Let me know.

Joe

See pics below.
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Wednesday, December 13th, 2023 AT 6:51 PM

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