Big problem

[Robs1000rr]

Can anyone help to resolve my issue .
The van will not lock or unlock, no interior lights , no right headlight , flashing coil light and build light out as well that’s all I know which has gone.
Please see attached scan from vcds
Any help would be good
Thank you

 

[T6ARF]

How old is your starter battery?

 

[Robs1000rr]

6 months old

 

[T6ARF]

@mmi @Robert @Dav-Tec your expertise would be much appreciated here please?

 

[CJW]

have you checked your fuses?

 

[Robs1000rr]

Van will start but also no windows will work as well

Been thought every fuse in fuse box and all ok .
The one at bottom of console and checked fuses under passenger seat as well .

 

[DXX]

There are several references to voltages of around 11.7V, that is a fully discharged AGM battery.

 

[CJW]

Others can verify but my memory of Terminal 30 is that it’s the permanent live from the battery.

 

[Salty Spuds]

Dodgy main earth cable?

 

[Dav-Tec]

Having a look through the drawings I'd confirm you have power at the fuses there is something blown or a ground missing.

Drawings would suggest fuse 2 in main fuse box under battery as this controls fuses 1-17 of fuse box C in the dash board.

SC14 does the canbus isolation relay coil which would explain why there's no Comms to module 13,

Radio is SC10 which is showing open circuit which it will if SA2 is blown.

Horn is SC11

There's a pattern forming... I'd dare say that's all related to the 5 faults in the BCM (09) why module 8 cannot be reached etc.

I'd check fuses 1-17 have power if not look at fuse 2 under the battery

 

[Robs1000rr]

I have checked all fuses in lower dash and fuse box in front of battery . Got cover off from under battery try and all look ok but which is number 2 fuse ?

 

[Robs1000rr]

I have checked all the big fuses with continuity tester and all off them beep ok .

 

[roadtripper]

While you're there check all the nuts on the fuse mounts just in case given it's a pain to get to.

What's the voltage reading across the battery while you have it disconnected?

 

[Dav-Tec]

For reference number 2 is the one to the right of the black one

You ideally want to be checking fuses for voltage either side not continuity sometimes you can get strange readings and a fuse can appear to be ok when it's not

 

[Robs1000rr]

It’s reading 12.6 v across the battery did have it on for quite some time yesterday with the vcds plugged in

 

[Robs1000rr]

Ok will do that

 

[roadtripper]

It’s reading 12.6 v across the battery did have it on for quite some time yesterday with the vcds plugged in

That's a reasonably healthy voltage - if it's dropping very low during cranking that hints towards a bad earth somewhere causing resistance at high current loads. If the voltage drops very low you may have modules dropping out and getting in an odd state.

One trick to see if this is the case is to temporarily use a good quality jump lead to connect the battery negative to a good point on the engine block and try to start.

 

[Robs1000rr]

The van starts ok it’s just all the other issues going on .

 

[roadtripper]

I understand - but your VCDS data shows very low voltages being reported by some modules alongside communication issues:

Voltage terminal 30: 10.781 V

You may be in a region where sufficient current is flowing to physically start the engine but the voltage drop in the electrical system while you do so is dropping control modules out and effectively rebooting them as the engine starts.

 

[Robs1000rr]

Hi dav sorry to as but how to I check voltage across the fuse as don’t have battery on and if connect battery will not get to them fuses.
Sorry for the silly question