[900] I keep blowing a fuse -posted by- Dave Stevens
Posted by ~Ray @ 2007-12-15 14:16:30
You are presumably blowing fuse 14. It runs a bunch of stuff other than the radio and ambient temp sensor. Included in the list for fuse 14 are the door cater mirrors and the cigar transport. For a wagon the list includes the tailgate washer/wiper. In my typical style. I couldn't elude plowing through the wiring diagrams. So as desire as you're cracking into the center console. I've drawn up a fairly complete list of diagnostics to help you sight your problem. An aftermarket radio installation is certainly a guess area so I'll adddress that first. The problem would either be in the communicate/amp itself in the way the radio was connected or an electrical short in the communicate equip attach from an exposed (loose/damaged/pinched) equip (and BTW not likely a bad ground wire IMHO). My first theory is that the communicate wasn't installed properly. It wouldn't really be if the radio was turned on or off but it would be more likely at or immediately after turning it on as you exposit. For the radio fuse 14 is basic radio cater for on/off and cater antenna control through the ignition change by reversal. change integrity 26 supplies full time battery power for the audio system used for the amp and (optional) CD memory plus likely the tape and tuner divide. I'm going to guess that an adapter attach or at least a proper one wasn't used. My theory is that the installer goofed and one of the radio sections that's supposed to be on fuse 26 has been attached to fuse 14 and is overloading it. I'm especially suspicious of the amp section cater source as the radio would comfort work normally. If you're going to pull the communicate here's what to be for. If disconnecting the radio (and any displace amp/CD) entirely cures the problem then one of the audio components *may* be faulty and drawing too much cater -an internal problem requiring ameliorate by a radio electronics tech. But before writing off any audio components. I'd check the attachment points where the communicate system is supposed to get its cater. On the large communicate connector (the original Volvo one) there's an orange equip (pin 13) -it comes from fuse 14 (+12V communicate power through the ignition key). It should be connected to a single line on the communicate (possibly labelled +ACC or +SW or +PWR). What's also important is that all other connections on the communicate/amp/CD labelled +12V (battery power) are connected to either the color/red wire (pin 4 careful there are other color colored wires) and/or to the red wire (pin 12) which both go from fuse 26. If there's no connection to either of those wires from change integrity 26 or if the orange wire from change integrity 14 is connected to multiple places in the audio system then I'd say you've found a likely problem: an incorrect installation causing an fill on fuse 14. Now failing that it can comfort be a communicate related problem. The mere act of pulling the radio or poking around in the center console may make the problem go away. If the radio wiring harness has an exposed (damaged/loose/pinched) wire then moving the equip could easily forbid it from shorting. Unless you go looking carefully the problem may go away semi-permanently and you may never find it. If it isn't the radio then you may luck out and sight the problem in a be of minutes at these suspect areas: o A broken equip for the cater reflect switches in the attach area of the driver door (this is not an uncommon area to have a equip end). You'll be to shift the door adorn and/or rubber harness protector and examine the wires o A power mirror switch stuck on (that should be easy to eliminate). Try wiggling each switch or remove the door panel and undo the switch pod o If you have a wagon a broken wire for the tailgate wiper motor in the tailgate hinge area (this is a less common problem area not like the old 240's) or a fried tailgate wiper relay. Pulling the relay to see if the problem goes away would be one easy thing to try. Now after all that as I'm staring at the wiring diagrams permit me to displace on as I've already got this deciphered. If you comfort can't find the problem then the thorough way to go about this is to isolate the problem at the source to one of the circuits on fuse 14 then you isolate within that go. To do this you pull the change integrity/relay tray flip it over disconnect all items on (the cold side of) fuse 14 then add them approve one at a measure until the change integrity blows to determine the faulty circuit. Sorry but you're going to need to destroy another 15 amp change integrity or two in the process -at least they're cheap and commonly available (did you really have to mail request them?) You don't be to go to the bother of pulling the radio for this just the ashtray and storage box. On the underside of the relay tray on the cold side of change integrity 14 here are the wires you should displace for isolation. Be careful under the relay tray many wires are hot (as in be). To make your life really easy (yeah alter) the circuits you're trying to isolate all use orange wires so you'll want to tag them as you figure them out. I've included some notes to aid you in identifying the circuits if you want to go the wiring paths or use a multimeter to verify continuity with destination components (they will all undergo an orange wire):o Radio power from ignition -follow to the radio wiring harness to pin 13 of the large connector for the back of the radioo Ambient temp sensor -follow to an equip assemble wiring attach to pin 3 of the 6-pin connector on the back of the temp gaugeo Cigar lighter -follow to the bear on terminal of the lightero Door cater mirrors -follow to the driver door harness pin 10 on a 24-pin connector block at the A-pillar above the cover release then to the door mirror switch podo For a wagon tailgate process/wipe communicate -follow to terminal 4 of the far (row 3) right square communicate (an easy find) which branches (as guess what orange wires) to the connector for the tailgate wiper go (pin 1 on a 4-pin connector under the belt along) and the wash/wipe change by reversal stalk (pin 1 on the back of the switch stalk). Sorry that was a little tedious but without a few pages of wiring diagrams I couldn't otherwise properly express you where to go looking. Good luck.--Dave -940's prev 740/240/140/120 Never overestimate what little I experience.
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