VW Jetta (16/AJ) Tweaks

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Ross-Tech is not responsible for any damage or problems that may result from following these instructions. They are to be used at your own risk.

These instructions apply to the VW Jetta (16/AJ) MY 2011+ and VW Beetle (5C/AT/16) with BCM25 -or- PQ25 control modules.

  • It is always recommended to perform a complete Auto-Scan and save it prior to coding changes. Please see the Online Manual: Auto Scan Screen
  • Never Copy coding from a different vehicle and Paste it to your module(s)!

The installed control modules vary by vendor, firmware level and equipment level, some of the noted tweaks may not be supported by all control modules/vehicles.

[03] - Brake Electronics

On Vehicles using the MK60EC1 ABS system it may be possible to:

  • Alter the HHA (Hill Hold Assist) using the documented [Adaptation -10] Channel while connected to the vehicle.

[08] - Heating/Air Conditioning

Drivers heated seat memory
The Driver side heated seat level (i.e. 1, 2 or 3) should resume the previous level upon restarting the car.

  • Found in Adaptation. From the drop down list, choose Storage of seat heater level driver. Change to On and Save.
    • This may not be supported on all control modules.

[09] - Central Electronics / Body Control Module (BCM)

Note: Make sure to have all Doors unlocked, otherwise this Control Module may not communicate with the Scan Tool / VCDS.


All modifications are found in Found in [Coding - 07] > Long Coding Helper unless otherwise noted. Click on each of the Bytes and Bits for the documented options and check or un-check the appropriate boxes as shown in the example below:

[09 - Cent. Elect.] Or the module you intend on tweaking as per the list below
[Coding - 07]
[Long Coding Helper]
Click on each of the Byte numbers in row 3) and you'll see the selectable options below. Check or Un-check the boxes for the desired results. Example: Comfort Function for Power Windows via Remote Control active

Close the Long Coding Helper by clicking the Windows X box on the top right of the screen or clicking the Exit button on the top left of the screen to send your altered Coding value back to the Coding screen.
[Do It!]

Comfort Turn signals Number of flashes and turning On/Off the feature

  • Number of flashes found in Adaptation. Select "Lights: Comfort Turn Signals (Cycles)" from the drop down list, choose the number of flashes and Save.
  • Coding or MFA / dash options may apply to this setting in some cases.

Note: MY 2011 Golf owners reported: Change comfort turn signals count in the VW Vortex

  • Turning On/Off the feature is found in Adaptation. Select "Lights: Comfort Turn Signals" from the drop down list, choose 0 = Comfort Turn Signals inactive -OR- 1 = Comfort Turn Signals active.

Daytime Running Lights (DRL)


  • The 2011+ Jetta and 2012 Beelte from the US/Canadian (NAR) market use a hardwired "TFL" signal into the BCM for DRL operation. This input is not monitored by the BCM for fault code recognition and simply removing the "TFL" pin at the headlight switch will disable DRL operation.

NAR 2017+ Facelift LED DRLs.

  • Discussion related to 2017 NAR market Jetta headlights with LED DRLs can be found here: 2017 Jetta SE TSI DRL wink
    • See post #8 for coding observations.


  • It is unclear at this time if other makes/models/brands outside of the NAR markets use actual coding alone, however several bits are available in the Long Coding Helper. If coding does not disable the DRL operation refer to the wiring diagrams and experiment with the TFL pin mentioned above.

All markets
Byte 18 - Do Not alter this if you are not retrofitting rear lights !

Alarm, Locking and Coming Home

Options are primarily found in Coding, Long Coding helper. Some Adaptation Channels may be available after enabling coding options.

Alarm Confirmation via lights and horn



Remote operation when engine is running for vehicles with KESSY

  • Found in Coding, "Remote Control with "Terminal 15 ON" active" would need to be enabled but this tweak would require the engine start button with KESSY.
    • Please note: VW/Audi have prevented alarm/locking activation with the door open and/or the ignition switched on to prevent the locking the vehicle with any of the keys inside it. This tweak will allow you to lock any spare or misplaced keys inside the vehicle!


Windows up via remote Comfort Operation (via Remote Control)

  • Found in Coding, Long Coding Helper "Comfort Function for Power Windows via Remote Control active".

[16] - Steering Wheel

Vehicles on this platform do NOT use a separate 16 module at all, instead those functions are a sub-system / slave of the 09-BCM module. This is the perfect location to link feedback related to retrofitting the multi-function steering wheel (MFSW) per NAR market configured Mk6 Jetta sedan models:

HUGE DISCOVERY- Activate Full MFD on your MK6

[17] - Instrument Cluster

The gauge needles should sweep from default to max upon starting the car. This is Not supported on all instrument clusters.

Seat Belt Light May remove the chime as well

  • Found in Coding, Long Coding helper.

Service Interval Reset

  • Found in Adaptation, Choose "ESI: Resetting ESI" from the drop-down menu.
  • Most North American vehicles with the UDS/ODX protocol instrument clusters have a "Reset" that can be accessed via the MFA, without a scan tool. Pictures here:
  1. Service Menu
  2. Service Reset
  3. Service Info

Modify Service Intervals Mileage and Time

  • Found in Adaptation, Choose "SID: maximum value of distance to service" or "SID: maximum value of time to service"

Fuel Gauge and Fuel Consumption Adaption

  • Found in Adaptation

[46] - Comfort System

Note: The Comfort System known from earlier Models has been integrated with the Central Electronics / Body Control Module (BCM) and is no longer available as a separate Address/Module. All related Diagnostics/Settings have to be performed via Central Electronics / Body Control Module (BCM).

[77] - Telephone

Some of the long codes 9W7 and similar telephone (Bluetooth) modules may support phone book sorting order by:

  1. First Name
  2. Last Name

If the module installed in the vehicle supports this modification simply open the Long Coding Helper while connected to the vehicle and look for the "Phone Book" option to see if it is present.


Some of the common retrofits are found in the Ross-Tech Wiki in this location: Retrofitting.
Additional retrofitting links and information can be found at the bottom of this forum thread: VCDS MKVI / MK6 Platform, Handy Coding tweaks