Hi all,
Bit of an odd one here, my reverse sensors do work although you have to get into the back seat and put your ears to the seat back to actually hear the
beeps, I looked into this and found its an aftermarket kit fiited. Its a scorpion sps 4 sensor system. Whoever fitted them made a real good job as the
sensors look factory fitted. Does anyone know why they are so quiet? the buzzer unit has a little switch, L-M-H, i check all positions and obviouslu
low, medium and high. On high you still cant hear it. Could it be a bad earth? Or just the unit is knackered. Its only 18 months old as thats the age
of the car. Any suggestions welcome....
Probably just a duff speaker open it up and try another. Other than that they are dead cheap on Ebay.
Cheers,
Bob
The bit that makes the actual beep is probably a cheap Chinese piezo transducer, and they are renowned for cracking across the back and going really
quiet.
The construction of these piezos is a ceramic disk on a small round brass plate. The ceramic disk has some electrodes printed onto it, and these get
broken when the ceramic cracks. I'd say that after 18 months in the extreme hot and cold temperatures inside a car, it's quite probable
that this is the problem.
Should cost less than a quid or two from Maplin to sort out. 
Ed.
Or it could be a normal speaker like ^^^ said!
[Edited on 20/8/10 by Madinventions]
quote:
Originally posted by Madinventions
The bit that makes the actual beep is probably a cheap Chinese piezo transducer, and they are renowned for cracking across the back and going really quiet.
The construction of these piezos is a ceramic disk on a small round brass plate. The ceramic disk has some electrodes printed onto it, and these get broken when the ceramic cracks. I'd say that after 18 months in the extreme hot and cold temperatures inside a car, it's quite probable that this is the problem.
Should cost less than a quid or two from Maplin to sort out.
Ed.
Or it could be a normal speaker like ^^^ said!
[Edited on 20/8/10 by Madinventions]
Easy - just look behind you as you reverse, and make increasingly frequent beeping noises as you approach obstacles. That's what I do - costs
nowt and is just as effective as any factory/aftermarket system. Real advantage is that it can be easily transfered to any vehicle.