I think I've blown some fuses - replace all or try to diagnose? Topic is solved

EamonnMR · Post by **EamonnMR** » 22 Dec 2018, 21:20

I had to replace the battery and when I did a bunch of the interior lights quit, the high beam toggle, and turn signals don't work. Oddly the radio works but the display does not. I figure I've blown a few fuses, I was wondering if it's worth trying to diagnose each individual fuse or is it SOP to just replace all of the fuses. Can the blown ones be found by testing with a multimeter? Is the dashboard fuse box really that much of a pain to access? And finally, do I need to worry about the head unit resetting if I pull the wrong fuse?

Post by **SuperHerman** » 22 Dec 2018, 23:16

Fuse panel should be on the dashboard end on right side. You need to open the door to access it. There should be a diagram there telling you what fuse is what. Go through those first. You can use a VOM. Some fuses have test jumpers that are exposed - others do not. If you have to pull fuses do only those that are relevant.

From there go through the fuses under the hood (check the applicable relays). Next would be to check your CEM (could be a relay). Finally or at the same time make sure your light switch and turn stalk are functioning (I have heard people with similar problems finding the fault there). As you were playing with the battery starting with fuses would not be a bad place to begin.

I had a situation with a 2002 XC70 where a shunt in the CEM was causing all my problems - it kept blowing fuses. If you get to the CEM - first thing to look for is blown fuses and failed relays (as your problems began when you serviced the battery).

EamonnMR · Post by **EamonnMR** » 23 Dec 2018, 07:01

Found this thread pinpointing which fuse to pull: https://forums.swedespeed.com/showthrea ... l-problems

Which on the 05 XC70 is fuse 10 in the compartment behind the door. Sure enough, it was blown, and luckily there was still a spare in there so I can indicate turns again.

Post by **cn90** » 23 Dec 2018, 10:15

Sure you can use a Voltmeter and check both sides of the fuse or remove the fuse and check for continuity.

But I have an easy trick when checking fuses...
- Use flash light and a magnifying loop, the blown fuse will be obvious when using this trick. Sometimes the "break" is about 1 mm (or less) in gap and difficult to see without flash light and magnifying loop.