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Loss of power at permanent live and ignition live pins

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Old May 14th, 2019, 20:53   #11
Clan
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As I said above, with replacing fuse 77 I now have pin 9 (permanent live) working but still nothing at pin 10 even though fuse 14 is ok.

Where do I look next?
if you have 12v on the thick wire going into the trailer module and nothing coming out on pin 2 of plug A ( the one that goes to Pin 10 on the socket ) then either the Trailer module is faulty , or it has not had the software or it is not getting the network signals , if the rest of the lights work it is likely to be the trailer module ..
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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Old May 14th, 2019, 21:04   #12
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Itís 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 Iím 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 canít get it working I might just connect it to pin 9. Thatís the usual one for battery charging anyway.

But Iíll 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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Old May 14th, 2019, 21:14   #13
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Of course itís 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. Itís probably worth checking the socket before dismantling the interior trim!
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Old 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. Itís obviously latched in place but I couldnít work out how to release it. Iíll have another look at it in the morning.

Itís strange that the fuse for pin 9 blew and perhaps thatís 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 thereís 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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Old May 15th, 2019, 21:33   #15
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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. Itís obviously latched in place but I couldnít work out how to release it. Iíll have another look at it in the morning.

Itís strange that the fuse for pin 9 blew and perhaps thatís 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 thereís 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.
pin 9 is separate to pin 10 , pin 9 goes direct to the fuse 77 which comes from the battery .

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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Old May 15th, 2019, 21:40   #16
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I havenít yet been able to extract the grey plug with the heavy red power cable feeding the trailer module so I canít 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 thereís no power in?

Iím not sure what you mean by ďplug A going to the socketĒ. Is that the 12 way connector that connects the tow bar socket wiring to the module?
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Old May 15th, 2019, 21:48   #17
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I havenít yet been able to extract the grey plug with the heavy red power cable feeding the trailer module so I canít 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 thereís no power in?

Iím not sure what you mean by ďplug A going to the socketĒ. Is that the 12 way connector that connects the tow bar socket wiring to the module?
yes that is the plug , all the wires should be white .... but have black numbers printed on the ends .
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Old 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 thereís no wire there.
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Old May 16th, 2019, 06:50   #19
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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 thereís no wire there.
Is that a Volvo wiring loom?

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.

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Old May 16th, 2019, 06:55   #20
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Yes, itís a genuine Volvo cable harness for the 2005 V50.
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