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Loss of power at permanent live and ignition live pinsViews : 2043 Replies : 27Users Viewing This Thread : |
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May 14th, 2019, 20:53 | #11 | |
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But make sure there is continuity between the pin 10 in the socket to the pin 2 in plug A on the trailer module First .
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May 14th, 2019, 21:04 | #12 |
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It’s quite a chore to get to the trailer module - half the interior trim needs to come out!
As I said above, the module had the proper software upgrade when the tow bar was installed last year. And I know I did have power to pin 10 afterwards as I specifically checked whether it came on with just the ignition or whether the engine had to be running. In the event, I discovered it came on with just the ignition so I’m now in the process of fitting a voltage sensitive relay on the trailer to trigger the auxiliary battery charging connection only once the engine is running. I was planning to connect the relay to pin 10 but if I can’t get it working I might just connect it to pin 9. That’s the usual one for battery charging anyway. But I’ll maybe have a go at stripping out the trim tomorrow to get to the bottom of this. Very odd, and very frustrating.
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May 14th, 2019, 21:14 | #13 |
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Of course it’s not impossible that the wire for pin 10 has come loose in the socket and somehow shorted pin 9 and in doing so blew the fuse. It’s probably worth checking the socket before dismantling the interior trim!
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Simon J |
May 15th, 2019, 21:01 | #14 |
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OK, I got the trim panels off this evening and the heavy red wire with the grey connector is presumably the power feed to the trailer module (via the 40 amp fuse 14)? Since everything works apart from pin 10, it seems reasonable to assume that power is getting to the module so the question is why is it not getting to pin 10. I tried to extract the plug with all the wires to the tow bar socket but without success. It’s obviously latched in place but I couldn’t work out how to release it. I’ll have another look at it in the morning.
It’s strange that the fuse for pin 9 blew and perhaps that’s related to the loss of power to pin 10, but how? Does pin 10 have a separate fuse other than the general 40 amp one that presumably covers everything apart from in 9. And how does pin 9 connect to the 15 amp fuse since pin 9 is powered from the trailer module? Edit: OK, looking again at the instructions for connecting the trailer module I see that there’s no orange wire (pin 9) connected to the trailer module plug so pin 9 must be fed from the circuit that supplies the 12v socket in the load compartment - hence the 15 amp fuse 77.
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Simon J Last edited by Simon J; May 15th, 2019 at 21:12. |
May 15th, 2019, 21:33 | #15 | |
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No , pin 10 comes directly out of the trailer module , have you got live going in the red wire to the trailer module and coming out at pin 2 on plug A going to the socket ? you need the ignition on of course . yes you are right about pin 9 being fed by the same wire as the 12v power socket . I suspect the trailer module at the moment ..
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May 15th, 2019, 21:40 | #16 |
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I haven’t yet been able to extract the grey plug with the heavy red power cable feeding the trailer module so I can’t be sure that the module is getting power. I was getting voltage at the socket on the tail light pins but when I think of it, not the full 12+V. So perhaps there’s no power in?
I’m not sure what you mean by “plug A going to the socket”. Is that the 12 way connector that connects the tow bar socket wiring to the module?
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Simon J |
May 15th, 2019, 21:48 | #17 | |
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May 15th, 2019, 21:51 | #18 |
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The wires to that connector are all coloured in line with the coding for the 13 pin socket and, according to the installation instructions, pin 2 is not used so there’s no wire there.
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Simon J |
May 16th, 2019, 06:50 | #19 | |
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Admittedly mine is 6 years old now but as clan says all conductors are white with black number identification. The volvo socket is also potted in that you cannot get to the terminals the wires are connected to on the 13 pin socket you plug into on hitch up as the back of the socket is filled with a jointing resin that sets hard.to prevent water ingress. Paul. |
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May 16th, 2019, 06:55 | #20 |
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Yes, it’s a genuine Volvo cable harness for the 2005 V50.
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Simon J Last edited by Simon J; May 16th, 2019 at 06:58. |
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