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Astra Mk5 Fault Code
mistergrumpy - 26/12/09 at 10:03 PM

Can anyone help. My mate is currently in Wales needing to return early Monday morning and his car has a fault code appeared. It is P1482 which translates as:
P1482 fan control circuit open 2 engine cooling B-004
P1482 fan control circuit voltage 2 too big engine cooling B-004
P1482 fan control circuit voltage 2 too small engine cooling B-004
Now the Haynes manual has shown me where the cooling fan relays are, all 3 of them and removing them one by one on my car, another Mk5 Astra fails to give the same fault code. I've also tried removing the fan fuse but that doesn't recreate it either. Any ideas exactly what the above means and what it may be?
I've recommended he doesn't drive it if the cooling fan's playing up.
Has anyone any ideas

omega 24 v6 - 26/12/09 at 11:35 PM

A quick google gives this but not much else.

quote:

http://www.rac.co.uk/forum/showthread.php?p=42401


I'd also imagine that the problem ( if it exists ) is in the control side of the fan. So either a sender ( or wiring to/from it) or a control module will be the problem ( if it exists)
If he needs to get home thenn you could always bypass the module and fit an inline switch for the relay. He'd need to keep an eye on the gauge himself and switch on'off the fan manually though. Unless he's caught in slow moving traffic or doing a lot of slow city driving then I'd imagine at the moment ( given the air temps being reported) that the fan would not be running at all under normal open road driving.

Good luck

mistergrumpy - 26/12/09 at 11:42 PM

Yeah I've read that link before. It appears that the Mk5 doesn't have a control module so yes I'm thinking like yourself but I think that a failed sensor has a different fault code of its own.
There's no way he could fit a bypass switch he's no idea about this kind of stuff.
If I could just recreate the fault on mine I'd understand it properly then as the fault code definitions don't mean much to me.
I'll have to just swap things over with my car if he manages to get it back.

omega 24 v6 - 26/12/09 at 11:53 PM

quote:

P1482 fan control circuit open 2 engine cooling B-004 P1482 fan control circuit voltage 2 too big engine cooling B-004 P1482 fan control circuit voltage 2 too small engine cooling B-004


Well from top to bottom my interpretation would be

fan control open circuit would mean
the sensor was bust OR wiring to/from it was broken/not continuous/unplugged or suchlike.
voltage to big would lead me to think there was possibly an alternator over voltage ( the only way it can go higher than 12 volts(ish)
Voltage to low would mean to me that there was a high resistance corrosion connection or damaged wire causing a voltage drop OR again an alternator problem.
the second 2 items could be tested with a meter but beware they may be intermitent/spikes or bad earths/connections only showing up when vibrations/engine movements cause the incident.

Also the code seems to be a generic one i.e all three of the faults are covered by this code but any one (or more) of them is the symptom of the fault.

All IMHO of course

MakeEverything - 27/12/09 at 12:44 AM

Sounds to me like youve had a short circuit.
The live to the fan has shorted out, causing high reference voltage, then under voltage as the fuse trips. This would also then give you an open circuit fault code??

Just a thought. Check the wiring, or even the fan itself.

mistergrumpy - 27/12/09 at 01:10 AM

Hmm. I'm at the same point as you Omega, Just thought maybe it could be narrowed down without the car being in front of me.
I guess the wiring and components need a looking at.

iank - 27/12/09 at 02:10 AM

quote:
I've recommended he doesn't drive it if the cooling fan's playing up.


In this weather? What are the roads like down there at the moment? if it's not queuing/5mph crawling for long periods then he should be fine - assuming the temp gauge is working OK and it's not overheating in normal operation.

mistergrumpy - 27/12/09 at 02:16 AM

You think so? The Mk5 Astra doesn't have a temp gauge as a lot of newer cars don't seem to.

iank - 27/12/09 at 11:02 AM

quote:
Originally posted by mistergrumpy
You think so? The Mk5 Astra doesn't have a temp gauge as a lot of newer cars don't seem to.


Really? Must make some money with customers killing engines then.

Fan shouldn't turn on unless you're sat in traffic, in sub zero temperatures with the heater on even that should take a while.
(says the man who sat in traffic in summer in a 214 with a broken fan sweating as the heater fan cooled the engine )

mistergrumpy - 27/12/09 at 04:19 PM

Well after lots of explaining it's turned out to be the fuse! A big square 40amp. He can't get one and Halfords have said only the dealer sells them, whether this is true I don't know but he's swapped it with one off his sisters Astra and the lights gone and sorted. Only to fond out what caused it now when he gets back.
Thanks for the advice offered.