Volvo V40 - electrical fault (no radio or interior lights)

[Mark Ferns]

HI,

I was installing a power amp today running from the +/- feed to the
radio and by mistage wired positive to ground and vice versa (the amp
smoked, naturally).

Having disconnceted the amp, I now find myself without any interior
lighting or LCD display on the dash. The central locking works

With the ignition key in posiiton 1, nothing happens on the dash (no
lights) and no radio. Everything else remains the same.

In position 2 I get Dash light, LCD display. All the normal lights go
off except the imobiliser light.

The car starts, all exterior lights work, wipers, blower, electric
windows.

I've just checked an interior lamp and it has not blown, but there is
no current to it (checked on multi-meter). I've checked all the
interior fuses, all are okay and the obvious ones in the engine bay
seem okay. I assume a relay has blown, any ideas which one?

As you can gues I'm very hacked off with myself, therefore any help in
resolving the problem would be appreciated.

Thanks

Mark

 

[Niels Bengaard]

I've just checked an interior lamp and it has not blown, but there is

no current to it (checked on multi-meter). I've checked all the
interior fuses, all are okay and the obvious ones in the engine bay
seem okay. I assume a relay has blown, any ideas which one?

Is exterier fuse no 5 ok ? It sounds like thats broken.
If that seems ok, then check if its + or - thats missing from the radio.

You can try following the current and see where it dissapers.
+ from the battery goes through fuse no 1 in the engine bay, then through
fuse no 5 in the engine bay and in the red cable to the radio.
+ only with ignition comes from interior fuse 9 through the yellow red cable

Niels

 

[Ernst-Paul van Etten]

Hi,

We suffered about the same problem after installing a cellular carkit. It
was one of the fuses under the hood.

Good luck.

EP