First Day.... First Question!

[Ryan-315]

So I'm in the process of fitting airride to me 2016 highline.
I need a switch live. Id like to not interfere with the loom. Iv read lots about taking from the middle row of the fuse box with a piggy back fuse. The problem i am having is when I'm checking the fuses with a multi meter they show 0.29 volts. I don't quite understand can bus but this is telling me it's being monitored by a can line??? If I take from there will I have a problem?. The only fuse I found that is 0 volts until ign is number 55 which is a green with brown trace. On a diagram says 5a camper equipment. Not sure what it feeds as it's a panel van. Iv been told to join to the ignition live on the obd port. It checks out but again with ignition off shows 0.29 volts. Any one help??

 

[Deaky]

I’ve piggybacked an ignition live from the middle row for my dash cam, DSP and amp remote. I used one of the empty slots in the middle row. You shouldn’t have any problems. 0.29v is pretty insignificant. Oh and welcome to the forum

 

[Dellmassive]

As above. What @Deaky said.

But be careful with obd2 port power. that is a starter battery 24/7 supply. . . . Not ignitioned switched.

Also CAN bus is the data communications for the modules and doesn't effect and power feeds...... though some modules do monitor some lines like lights Etc.... that s normally With a return feed wire or intrrnal pull up/down resistors.

 

[Ryan-315]

As above. What @Deaky said.

But be careful with obd2 port power. that is a starter battery 24/7 supply. . . . Not ignitioned switched.

Also CAN bus is the data communications for the modules and doesn't effect and power feeds...... though some modules do monitor some lines like lights Etc.... that s normally With a return feed wire or intrrnal pull up/down resistors.

The black with purple trace on obd is a switch live. A few people use it but iv also tested it and it's switched. I was just worried about this 0.29v all the switched lives show. I don't want any dash lights

Yeah I know it doesn't effect the power feed but some times adding into a monitored circuit throws up a fault doesn't it?

 

[Ryan-315]

I’ve piggybacked an ignition live from the middle row for my dash cam, DSP and amp remote. I used one of the empty slots in the middle row. You shouldn’t have any problems. 0.29v is pretty insignificant. Oh and welcome to the forum

I know .29v isn't anything but it does show something else is going on there. On pre canbus vehicles a switch live would be 0 volts until key is turned.

Cheers lots of info on here!

 

[Dellmassive]

The black with purple trace on obd is a switch live. A few people use it but iv also tested it and it's switched. I was just worried about this 0.29v all the switched lives show. I don't want any dash lights

Yeah I know it doesn't effect the power feed but some times adding into a monitored circuit throws up a fault doesn't it?

What pin number on the obd2 port were you referring to?

I'll bell mine out tomorrow and see what I get on the multimeter.

 

[Dellmassive]

Obd2 pinots

Pin16 is battery +12v

Pin4 is chassis ground. 0v.

Pin 6/14 is CAN hi/low