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Subject Topic: Tow bar electrics/audible buzzer Post Reply Post New Topic
Personflashard
11/4/2019 at 10:32pm
 Location: HEREFORD
 Outfit: Elddis Typhoon XLI View flashard's Profile View Profile   Reply to flashard Reply   Quote flashard Quote  
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Fitted a tow bar to my van so that I can to put all the awnings and kitchen sink in when towing the caravan. Tackling the elecs at the moment. Van has canbus wiring so fitted a bypass relay etc on the 12n and 12s and having lots of fun trying to route 3 12v feeds off the van battery :-/
Now need to wire in the audible buzzer. Should it be fitted on the indicator circuits after the 12n bypass relay. I am assuming so but we all know what assumption is ;-)


Personfreeatlast
12/4/2019 at 10:16pm
 Location: Teesside
 Outfit:  Mitsubishi ASX4 View freeatlast's Profile View Profile   Reply to freeatlast Reply   Quote freeatlast Quote  
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You don't need an audible buzzer with most canbus systems these days.


Personflashard
12/4/2019 at 10:29pm
 Location: HEREFORD
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If it has a switched relay to the towbar electrics with its own 12v supply would a failed bulb warning still come up on the dash display though. One of the reasons for the switched relay is to avoid false failed bulb warnings on the dash I think?


PersonLlaniDavis
12/4/2019 at 11:46pm
 Location: Llanidloes Powys
 Outfit: Skoda Yeti SEL4x4 +Bailey Ranger 460-4 View LlaniDavis's Profile View Profile   Reply to LlaniDavis Reply   Quote LlaniDavis Quote  
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Quote: Originally posted by freeatlast on 12/4/2019
You don't need an audible buzzer with most canbus systems these days.


The problem though is that the OP has fitted a by-pass system and therefore it is more than likely that all the normal systems that will work with a properly reprogrammed CanBus system won't work correctly now.

That is certainly true of the newer VAG range vehicles, as several Yeti owners have found!


PersonLlaniDavis
12/4/2019 at 11:48pm
 Location: Llanidloes Powys
 Outfit: Skoda Yeti SEL4x4 +Bailey Ranger 460-4 View LlaniDavis's Profile View Profile   Reply to LlaniDavis Reply   Quote LlaniDavis Quote  
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Quote: Originally posted by flashard on 12/4/2019
If it has a switched relay to the towbar electrics with its own 12v supply would a failed bulb warning still come up on the dash display though. One of the reasons for the switched relay is to avoid false failed bulb warnings on the dash I think?


Unlikely, as the trailer electrics are now only connected through a relay powered system so the CanBus bulb failure system no longer properly "sees" them.

That is certainly the case with VAG vehicles.


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PersonGrampian91
13/4/2019 at 2:25am
 Location: Midlands
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Why did you route 3 x 12v feeds from the battery?

Your bypass relay should have a buzzer output already, you dont want a buzzer on the canbus side. That wont be fun.


Personflashard
13/4/2019 at 8:16pm
 Location: HEREFORD
 Outfit: Elddis Typhoon XLI View flashard's Profile View Profile   Reply to flashard Reply   Quote flashard Quote  
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All wired up and tested. Tested it before I fitted an audible buzzer and lo and behold there is a buzzer on it already
The 3 12v feeds were 2 for the switched relay to 12n and 1 for the relay to 12s. Not sure why it requires 2 for the switched relay? Just followed the instructions


Personfreeatlast
15/4/2019 at 3:47pm
 Location: Teesside
 Outfit:  Mitsubishi ASX4 View freeatlast's Profile View Profile   Reply to freeatlast Reply   Quote freeatlast Quote  
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Three feeds is correct. One is for the caravan lights, one for the permanent live to the caravan and one for the switched live to the caravan.


Personfreeatlast
15/4/2019 at 3:49pm
 Location: Teesside
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Quote: Originally posted by LlaniDavis on 12/4/2019
Quote: Originally posted by flashard on 12/4/2019
If it has a switched relay to the towbar electrics with its own 12v supply would a failed bulb warning still come up on the dash display though. One of the reasons for the switched relay is to avoid false failed bulb warnings on the dash I think?


Unlikely, as the trailer electrics are now only connected through a relay powered system so the CanBus bulb failure system no longer properly "sees" them.

That is certainly the case with VAG vehicles.




This is exactly the setup on my Mitsubishi with the manufacturer's wiring harness. It all works fine without a buzzer.



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