Fairlane Sportsman sub noise

4vxc · 12-10-2016, 10:34 PM

The factory sub woofer on my 01 Fairlane Sportsman sometimes makes a very loud booming noise when the ignition is switched on.
Sounds loud enough to damage the speaker,I scanned the car and it said speaker wire short circuit .
Ever heard of this before?

mcfly94 · 12-10-2016, 10:36 PM

Quote:

Originally Posted by 4vxc

The factory sub woofer on my 01 Fairlane Sportsman sometimes makes a very loud booming noise when the ignition is switched on.
Sounds loud enough to damage the speaker,I scanned the car and it said speaker wire short circuit .
Ever heard of this before?

Someones probably cut a wire, not uncommon on ford and holden! check over all wiring, then check to see if amp functioning correctly

macman · 13-10-2016, 08:02 PM

Mine did this once when I parked nose down in heavy rain. A trickle of water came in through the boot and made its way down to the amp in the rear right hand quarter. Made it boom and crackle and pop a few times then popped the fuse.

**X-AHH** · 13-10-2016, 08:16 PM

Check the condition of the sub-woofer cone and coil, then if ok, perhaps the soft-start/ramp-up circuit of the amp is intermittently faulty.
You should also disconnect the speaker cables at both ends and check for short circuits with a multi-meter if the vehicle codes indicate a short circuit problem.

4vxc · 15-10-2016, 09:01 PM

Quote:

Originally Posted by xahh

Check the condition of the sub-woofer cone and coil, then if ok, perhaps the soft-start/ramp-up circuit of the amp is intermittently faulty.
You should also disconnect the speaker cables at both ends and check for short circuits with a multi-meter if the vehicle codes indicate a short circuit problem.

how do you do that with the multi meter?

.:4:. · 15-10-2016, 09:09 PM

Check the speaker wires to the sub. Maybe the negative has been rubbing on something and rubbed through the insulation and is earthing out to the chassis. Its a long shot, but years ago I helped out a friend who bought a lazer for pocket change with a head unit and speakers in it, and the derick who installed the thing only ran positive wires from the deck to the speakers, and grounded the speakers to the chassis. It did all sorts of weird things when the lights were on or whatever

**X-AHH** · 16-10-2016, 12:26 AM

Quote:

Originally Posted by 4vxc

how do you do that with the multi meter?

Instead of writing a book on the subject, I found a website that describes the concept.

http://techin.oureverydaylife.com/ma...ted-13944.html

The continuity range /setting on a multi-meter is the one that makes it beep when the meter probes are touched together.

Please keep asking more questions if you are unsure of how to proceed.

4vxc · 17-10-2016, 02:35 PM

Quote:

Originally Posted by xahh

Instead of writing a book on the subject, I found a website that describes the concept.

http://techin.oureverydaylife.com/ma...ted-13944.html

The continuity range /setting on a multi-meter is the one that makes it beep when the meter probes are touched together.

Please keep asking more questions if you are unsure of how to proceed.

Thanks,I read that link so that means I have to get to the back of the head unit to do the continuity check?

**X-AHH** · 17-10-2016, 03:36 PM

Quote:

Originally Posted by 4vxc

Thanks,I read that link so that means I have to get to the back of the head unit to do the continuity check?

No.
If its only the sub-woofer making the wrong noises, just unplug the speaker wires for it at each end to test. From memory, the amp for your sub should be in the boot. Under the carpet, RHS next to the tail light.

4vxc · 17-10-2016, 04:39 PM

no worries thanks, Ill let you know what happens

4vxc · 18-10-2016, 12:35 PM

just did the continuity test from the sub to the amp was ok
also tested on ohms settings was also ok

**X-AHH** · 18-10-2016, 01:24 PM

Quote:

Originally Posted by 4vxc

just did the continuity test from the sub to the amp was ok
also tested on ohms settings was also ok

Does the woofer cone have any cracks, rips or damage?
Does is the ohms reading for the woofer coil sit outside the range of 2 and 8 ohms?
Did the area around the amp in the boot have any obvious signs of moisture or corrosion?

If you answer NO to all of the above, it's most likely going to be another speaker or cable fault, the amp or header unit at fault.

The speaker short circuit fault code you found is still a concern.

Have you tried adjusting the balance and fader controls of the audio system to test the performance of each speaker individually?