The door lock modules really aren’t too expensive individually. If opening up your MK4 jetta, golf, or passat module seems too much of a headache then this fix is likely for you. Once you’ve found a new micro-switch(es) then simply replace them and that should resolve your issues. There may be alternative micro-switches you can track down that will also work. The part numbers for the MKIV micro-switches are as follows: The fourth is found within the mechanical portion of the door lock module. The above image shows three of the four micro-switches. MK4 Door Lock Fix #2 (Micro-switches)Īs explained earlier, the micro-switches are another area that causes issues with the MK4 door locks. Adding more solder will simply help strengthen the connection and hopefully avoid the issue popping up again in the future. The first step should re-establish the connection. From there the steps are pretty simple to fix the MK4 door locks: All you need is a low-watt soldering iron and a little bit of solder. The issue occurs in the area indicated by the above image. It’s actually a pretty simple solution once you’ve got the door lock mechanism removed and locate the issue. This fix is focused on those experiencing issues with their MK4 door lock module solder connections. Replacing MK4 door lock module MK4 Door Lock Fix #1 (Solder) If you’re going the DIY route and plan to fix up the current MK4 door lock module then the following guides may be helpful: Lastly, we’ll discuss what may be the preferred and easiest solution for some – simply replacing the entire door lock module. Again, the most common problem is with the soldering so we’ll touch on that first and then move onto the micro-switches. Of course, this also depends on the specific underlying problem.
If your Jetta (or any other MK4) door locks are not working then you have a few different possible fixes for the issue. MKIV Door Locks Not Working Solution & Fix There are also a few different fixes for the problem. The varying pins also explain why some experience various issues whether it be MKIV doors not locking, automatically locking while they’re open, etc. The soldering on MK4 door lock module pins 3, 5, and 7 appear most problematic.
MK4 GLI CRACKED
Ultimately, when the solder connection from the leads in the harness to the circuits is cracked it will result in intermittent or lost connection. This may be due to poor soldering from the factory, not enough soldering, or too much movement causing cracks. The main problem with MKIV door locks are the solder joints cracking over time. However, it appears less common than the main culprit. This would typically indicate a sticky micro-switch. If you’re overly angry about the door lock and smack the door – or slam it shut – things may suddenly start working. In some cases, a sticky micro-switch may cause issues with the MK4 Golf, GTI, GLI, Jetta, or B5 Passat door locks. Finally, the fourth monitors the position of the door (open or close). Another monitors the locking mechanism and whether the door is locked or unlocked. The MKIV uses at least four micro-switches two determine if the key being turned to lock or unlock the doors and open or close the windows. Initially, many suspected the door lock module issues were caused by sticky micro-switches inside the electronics portion of the module. These parts will need to be removed in order to reach the MK4 door lock module. The door lock mechanism resides inside the door hidden behind the inner door panel and window regulator carrier. It’s pretty standard tech on modern day cars, but it was relatively new during the MK4’s production. Unlike a basic mechanical door lock the VW MKIV uses an electro-mechanical device called a door-lock module or mechanism. It’s also not localized to one specific door, but rather may occur to any or multiple doors.
There are all sorts of odd issues with the MK4 door locks. As explained in the introduction, it’s not just one problem like the doors not locking. However, the issues aren’t limited to only those years. MK4 Door Lock ExplanationĪ lot of Volkswagen’s that experience the door lock issues are in the 1999-2001 era. In this post, we’ll explain the MK4 door locks and offer some solutions and fixes for the issue. If your MK4 Jetta, GLI, Golf, or B5 Passat is experiencing door lock issues you’ve landed in the right place. There are a handful of weird things that happen. Problems include MK4 doors not locking, the car not recognizing when a door is open, doors automatically locking while they’re open, etc. Many Volkswagen MKIV owners experience various issues with their door locks acting up. Disclosure: This post may contain affiliate links, meaning when you click the links and make a purchase, we receive a commission.