It's worth checking all of those nuts on the cables in the box under the battery. The CAN system appears to be down. You could have a look at the gateway installation list and see what is ticked. Obviously don't make any changes until you have recorded what is there now. If something is ticked that you don't have or something is missing that you should have it can sometimes cause confusion to the system. It could be the result of a low battery.
Big problem
- Thread starter Robs1000rr
- Start date
Pair of jump leads to connect the battery, but via the engine mount ground on the Negative.
Will I need to have ignition key turned on ?
Just check 1-9 fuses under the battery tray and both sides to each show a voltage of 12.5
Static voltage can be deceptive tbh. You need to know what the voltages are when load is applied when the van is starting/cranking.
Agreed now you've proven the fuses are fine you ideally want a multimeter with a mini/max function to see what the battery drops to when cranking.
We've found that transporters drop considerably when cranking and a weak battery will exaggerate this.
We've found that transporters drop considerably when cranking and a weak battery will exaggerate this.
For checking voltages accross big fuses under the battery, no. They are connected straight into battery positive and not ignition switched.
Is that the fuse box under the lower dash sc1 ?
Ps could it be the bcm unit gone down ?
If there's been a sudden change and the positive supply side looks ok might be worth seeing what's failing and if they have a common ground point.
We recently had a thread on a mystery collection of failures that was traced to a loose ground point under the dash, this could be similar?
We recently had a thread on a mystery collection of failures that was traced to a loose ground point under the dash, this could be similar?
Would of thought that would of stopped van starting though?
Hi all battery is at 12.8 v and when started dropped down to 11.9 but then went back up to 12.8
Checked 1 to 15 fuse both sides and all showing 12.8v .
Checked 1 to 15 fuse both sides and all showing 12.8v .
Hi would a faulty bcm be bringing all the faults up ?
I think a wiring fault seems more likely than a BCM fault. You have VIP membership so you can access the wiring diagrams. Find common points of wiring between the modules reporting a failure, and don't forget the ground side.
Thank you everyone for your help and have found the fault it was the black plug on the bcm the clip was not pushed all the way down and as soon as I pushed it in all my stuff came back on .
Excellent news and a great relief for you, I'm sure!
Yes well happy I found it as did not want to take it to Vw to find the problem as it would of been expensive
Any idea on how it became disconnected?