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Old 27-02-18, 01:59 PM   #1
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Default Has someone deliberately shorted my BSM?

My dash brought up that I had an airbag fault as well as my air con fan not working. I have alos randomly been getting an ESP fault.20180227_162727_1519742988949.jpg So I decided to check the fuses, the ones in the passenger footwell were fine, then I checked under the bonnet and found the cable in the pics burnt and thoroughly corroded. It seems that the insulation on them has been stripped, they've been wrapped together and covered in electrical tape. Would I be right in thinking that a previous owner/mechanic has done this to short the BSM? Or is there another explanation? Could this be the reason I'm having these electrical faults? Also what does this particular plug do?

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Old 27-02-18, 02:49 PM   #2
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Hi Boshy

I don't know what the wire is but I've seen something similar on a car that has had taxi meters and taxi signs connected to a constant live. If that is a constant or even a switched live that could be an explanation..

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Old 27-02-18, 05:10 PM   #3
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If I remember correctly, those wires come with insulation tape around it to simply hold the wires in place from the factory.

What looks like has happened, the insulation from the wires has cracked, leaving fresh copper exposed to the environment. This has reduced the amount of copper available to transmit power, increasing the resistance, which heats the wire up, causing the burns etc. - I've gotten to this theory by looking at the plug the wires go into - there's a section of insulation missing near the plug!

Trace the wires back, go to CPC Farnell, buy the correct diameter wire and replace all the damaged sections with good solder. You might be able to purchase the section of the loom separately though which might be cheaper / easier.
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Old 27-02-18, 05:31 PM   #4
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As above this is a failure not sabotage this is A main power feed both wires are indeed taped together originally if i remember correctly the wires go to the BSI and the cooling fan circuit
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Old 27-02-18, 07:05 PM   #5
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check your fan is free , if the fan has seized or is sticking that may be the cause as the extra load will cause resistance and over heating of the wires . also check the relays and wiring on the fan for the same fault
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Old 27-02-18, 07:45 PM   #6
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Quote:
Originally Posted by Haggis View Post
check your fan is free , if the fan has seized or is sticking that may be the cause as the extra load will cause resistance and over heating of the wires . also check the relays and wiring on the fan for the same fault
Nope, fuse would pop in that situation. Any half decent engineer would spec the fuse rating lower than the wire capability to avoid overheating and a potential engine fire.

But as the fan is easy to get to, go ahead an give it a spin... with a tool and not your fingers!
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Old 27-02-18, 07:59 PM   #7
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It would be a 40 amp fuse possibly even more so it may not blow the fuse !

I dont think that wire is fused to be honest and if the current draw is high but not high enough to blow the fuse it can and will melt the wires we have all seen melted headlight bulb connections over the years same thing too much current but not enough to blow the fuse.
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