Trailer Lights Inoperative, Update Programming (Flashing) Trailer Control Module (GROUP 01, NO. 05-12)

TOOL REQUIREMENTS

• VAS 5051 or 5052 (with Basis CD V.06.05 and the Brand CD V.06.48 or higher) with old diagnosis logs erased prior to start.
• "Update - Programming" (flashing) CD W42TOUAREGTHCD.
• VAS 5051: connected to vehicle and to 110V AC Power supply at all times during procedure.
• VAS 5052: connected to vehicle with battery voltage requirements met.

TIP:  Additional copies of the "Update - Programming" CD (Literature Number W42TOUAREGTHCD) may be ordered from the Volkswagen Technical Literature Ordering Center at www.vw.ddsltd.com, or by calling 1-800-544-8021 from 8:00 a.m. to 8:00 p.m. EST Monday through Friday. This number can be dialed in both the United States and Canada.

VEHICLE REQUIREMENTS

• Battery MUST have minimum no-load charge of 12.5V (failure to maintain voltage during update process can lead to Control Module failure) (you must use an approved battery charger to maintain battery voltage).
• Any appliances with high electromagnetic radiation (i.e. mobile phones) switched OFF.
• No Stored DTC's, erase any stored DTCs.

PRIOR TO PERFORMING PROCEDURE TO "UPDATE - PROGRAMMING" (FLASHING) THE CONTROL MODULE

• ALL fault memories must be interrogated and erased.

TIP:  Failure to erase ALL fault memories may cause "Update - Programming" (flashing) procedure to fail!

TIP:

• When performing the reflash procedure, ALL DTCs for all systems are erased.
• DTCs linked to Guided Fault Finding function tests will be lost. Therefore, always address stored DTCs for Customer concerns unrelated to the reflash procedure first.

• Select vehicle system "69 - Trailer function".
• Select Diagnosis function "07 - Code control unit".
  Fig 1: VAS Display - Select Diagnosis Function

  
• Change coding from "1" to "2".
• Finish coding by selecting the backward arrow < on navigation bar.
• Change coding from "1" to "2".
• Finish coding by selecting the backward arrow < on navigation bar.
• Select Diagnosis function "06 - End output".
• Select Diagnosis function "00 - Collection services".
• Select "Check DTC memory - complete system". which will interrogate all fault memories.
• Erase ALL fault memories.

Once ALL fault memories have been erased:

• Install "Update - Programming" (flashing) CD in diagnostic tool.
• Select vehicle system "69-Trailer function".
• Select "Update - Programming" option at bottom of screen.
  Fig 2: VAS Display - Select Update - Programming

  

"UPDATE - PROGRAMMING" (FLASHING), PERFORMING

After selecting "Update - Programming" function:

Fig 3: VAS Display - Update-Programming Warning

• By selecting the forward arrow > on navigation bar, the programming procedure begins.

• Similar screen appears:
  Fig 4: VAS Display - Programming In Progress

  
• Previous data in the Control Module is erased and new data is being transferred to the module from the flash CD.

TIP:  Approx. flashing time is 5 minutes.

TIP:  If, during the "Update - Programming", a fault message is displayed:

Fig 5: VAS Display - Fault Message

• Confirm that VAS 5051 or VAS 5052 diagnostic tool power supply is adequate and that ALL appliances with high electromagnetic radiation (i.e. mobile phones) are switched OFF.
• The "Update - Programming" (flashing) process must then be started from the beginning using the "Repeat" button (arrow). DO NOT use the "Cancel" button.

TIP:  On NO occasion should the "Cancel" button be selected.

Once "Update - Programming" (flashing) is complete:

• Similar screen appears.
  Fig 6: VAS Display - Programming Log

  
• New Control Module Part Number and updated software level is displayed at (arrows).

Once "Update - Programming" (flashing) is complete, the control module must be re-initialized.

• Select the forward arrow > on navigation bar.
  • The tester requests you to switch the ignition OFF.
    Fig 7: VAS Display - Switch OFF Ignition

    
• Switch ignition OFF.

TIP:

• Wait at least 20 seconds before switching the ignition back ON (failure to wait at least 20 seconds may damage the Control Module).

After waiting 20 seconds:

• Switch ignition ON.

After switching ignition ON, the Control Module has been re-initialized, however, fault memories must now be erased.

• Select the "Continue button"

FAULT MEMORIES, ERASING AFTER "UPDATE - PROGRAMMING" (FLASHING)

Due to the CAN bus system, fault messages will be stored in various Control Modules during programming.

To erase ALL fault memories:

• Confirm by selecting the forward arrow > on navigation bar.
  • Erase fault memories takes approx. 15 minutes.
    Fig 8: VAS Display - Erase Fault Memory

    

Once fault memories have been erased:

• Similar screen appears.
  Fig 9: VAS Display - DTC Memories Erased

  
• Function ended appears at bottom of screen.
  • Finish update of Control Module by selecting the backward arrow < on navigation bar.
• Similar screen appears.
  Fig 10: VAS Display - New Control Module Part No.

  
• New Control Module Part No: 7L0 907 383G and updated software level "8854" will appear at arrows.
• Flash CD can now be removed from VAS 5051 or VAS 5052 Diagnostic tool.
  • Print the "69-Trailer function" screen to verify Control Module update software level.
  • Attach print to vehicle Repair Order.