Magazine for the auto service professional
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26 | September/October 2014 is ON, the ECU provides current to the transponder key coil and produces a faint electric wave. A transponder chip in the key receives this wave, and sends a key ID code signal, which is sent to the ECU. The ECU matches the key's ID code with the vehicle's ID code (previously registered in the ECU), and sends the results to the primary ECM using SFI communication. Audi remote key communication This TSB applies to all 2000-2010 Audi models. Potential issue: central locking via the remote control doesn't work either spo- radically or permanently, but the locks can be operated manually. Missing synchronization between the remote control key and the vehicle can occur if the battery has been disconnected or if the battery in the remote control has been replaced. If other senders operate in the same fre- quency range (mobile phones, TV stations, wireless headphones, baby monitors, other vehicle remote controls, etc.) the remote control key may have been temporarily switched off because a clear identifcation of the remote control key is not possible. This is necessary to prevent an uninten- tional unlocking of the vehicle by other unrelated senders. A4 (8D, 8E, 8H) 2000-2008: 1. Open the vehicle mechanically with the key. 2. Press the unlock button of the remote control key. 3. Insert the key into the ignition lock and switch the ignition to the ON position. 4. Switch the ignition OFF again and remove the key. 5. Press the unlock button or the locking button of the remote control key. NOTE: Model year 2002 or later: If the synchronization procedure was not suc- cessful, adapt the remote control key(s) to the Central Comfort System control module (address word 46) using the VAS scan tool. Follow test plan J393-central control module for comfort system, adapting remote control key via adaptation (channel 21). Sometimes following the "erase all memory positions frst" test plan produces better results. A3, A6 (4B), TT, TTR: 1. Press one of the buttons of the remote control key. 2. Lock or unlock the vehicle once, mechan- ically with the key. 3. The complete process must take no longer than 30 seconds. 4. If the synchronization procedure was not successful, adapt the remote control key(s) to the central comfort system con- trol module as described earlier. A4 (8K) 2009-2010, A5 (8T) 2008-2010: 1. Press a button on the remote key within the range of the vehicle. 2. If necessary open the vehicle with the emergency key on the door lock. 3. Switch the ignition on and off. A6 (4F), A8, Audi Q7: 1. Open the vehicle mechanically with the key. 2. Insert the key into the ignition lock and switch the ignition ON. 3. Switch the ignition OFF again. 4. If the synchronization doesn't help, check the battery of the remote control. The battery voltage must be 3.0V or above. 5. If the battery voltage is below 3.0V, replace the battery and perform the syn- chronization again. 6. Check whether there are any interfering senders in the vehicle. 7. Check whether there are any interfering senders in the area. The Tech Bench Regardless of the convenience offered by a smart key fob/card, it's wise to lube and con- frm operation of the mechanical door lock whenever the vehicle is in the shop.