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Jag-lovers' Ebooks
- Jag-Lovers' xj40 Ebook -

6.4.2 - Quick Check List ( Brett Gadzinsky,  )


Bulb Failure Modules (BFMs) have a reputation of maddening failures on XJ40s, but there are things to check before jumping in replacing or repairing the modules.

If you have a bulb fail alarm, check all the bulbs, the headlights, high and low beams, and driving lights, the turn signal, side marker, brake lights, backup lights, front and rear fog lights. Even if you don't have front fog lights, the shorting plug needs to be in the connector for the fog lights.

Its best to use plated base bulbs, not brass base bulbs, as the sockets are plated, and using dissimilar metals in a hot moist environment is sure to cause corrosion problems over time. The brand of the bulbs is not important, but the wattage is.

On some cars, the bulbs can get loose in their sockets. Make sure the prongs at the bottom are forcing the bulbs lightly into their sockets.

If all the bulbs are good, and they are all working, and you still have the alarm, you need to remove the bulb fail modules from the car and resolder the bad solder joints inside.


 

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