306 hdi heated rear back window fuse

[Welshy_Pete]

Hello on my 306 hdi the heated rear back window fuse keeps blowin.

There just a 15amp fuse in there which must be wrong. But Im sure its ment to be something else which is correct?

[CitroJim]

Is the fuse blowing instantly with some vengeance Pete or is it going gently and lasting for a number of seconds?

The former means a short circuit and the latter it's either under-rated or the heater is drawing a little too much current.

I'd very much suspect a short due to failed wiring in the flexible concertinas between the body and tailgate. This is a very common problem in other PSA cars.. It is under constant stress from bending and suffers fatigue.

15A is about right for a heated rear window according to some quick research...

[spider]

Take the trim off the hatch and check the rear wiper relay has not had a drink of rainwater or suchlike. Remove it if needed for a closer look.

Yes I *know* you said heated rear window, not wiper.

Might not be the issue, but this 'concern' on a 306 tends to sometimes knock out some of the instrument panel as well. Its worth looking though.

[Welshy_Pete]

The electric window motor stopped working must be siezed up. So I took the motor off then the fuse has kept blowing since then.

[spider]

I wonder if it is a broken loom although I do not recall of hearing a tailgate one breaking, although its known that the door ones are a common concern on an older car. They could of actually "fixed" this at shape change in 97 (I remember mentioning it at the time) but chose not to.

I don't think any supply for the HRW would run through the doors however I guess if it *always* blows you could unplug the doors plugs and see if it still does it.

If I remember correctly the multiplug for the rear end as such is on the right hand 'c' pillar area or possibly a bit further forwards maybe worth looking there / unplugging and checking to see if the 'rear' part of the loom is OK or shorted out.

[Welshy_Pete]

Just been looking online and the Heated rear screen, heated mirrors. Rear screen demist (cabriolet) is the F27 30A

link
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