Bulb Failure Modules (BFMs) have a reputation of failure on XJ40s (XJ6), usually it’s one of a few simple things.<\/p>\n
1:<\/b> Make sure that every bulb works! The failure module is designed to alert you that a bulb is out, so check this first (easy stuff first).<\/p>\n
2:<\/b> Clean the bulb contacts in the sockets. This is a pain, but this too is a trouble spot. CRC spray electronics cleaner is a good tool to use and it’s available everywhere. Use it outside, please, we don’t want anyone poisoning themselves.<\/p>\n
3:<\/b> Brass-based bulbs tend to corrode more easily, so don’t use them. The safest bet is to get all of your bulbs from Jaguar.<\/p>\n
4:<\/b> Hooking trailer lights to the lighting harness can also cause the failure module to trigger.<\/p>\n
5:<\/b> Open up the modules and look for broken solder contacts. This is usually the problem with the failure module and can usually be rectified easily with careful application of a soldering gun.<\/p>\n
6:<\/b> Once all of these steps have been taken and the failure module still acts up, you are usually stuck with replacing the failure module.<\/p>\n