Caddy 2012 1.6tdi - Wonts Start (Dash, ignition, and some other things all dead)

[Crasher]

Sounds like the line 15 relay is faulty, I had this on a Golf 7 a couple of weeks ago.

[aliS]

Crashed/VAG bound thanks for your feedback input so far. Apologise I have not replied, with all that’s been going on I have been on an emergency roster at work and child care at home with the caddy stuck at her parents (venerable) preventing me spending time on it.

Thankfully though trailering it back home tomorrow so fingers crossed getting it at home will give me time to get to the bottom of this.

Cheers,

Alo

[aliS]

Hi Arek, I’ve just got my van home after 2-3 months of being abandoned at the in laws. Will let you know how I get on but you do sound like you have the same if not very similar issue.

Hello Everyone.

I have VW Touran 2012 1.6TDi with excatlly the same issue like VW CADDY 1.6 above.

1. No ignition, No cranking, no starting.
2. DASH - no light up complete dead / but tested on bench working fine.
3. No communication with any modules / but on bench no problem example with ECU PCR1.6 or Dash
4. Nothing happened when ignition on or key in ignition. / only working remote
5. Working only radio
6. Tried new set ECU, BCM, Fuse box under bonnet, dash, Can module, ignition barrel, squib module / still no communication
7. download diagram from VW ERWIN / check all wiring im in point that i not getting ignition 12v via relay from BCM

Wants to go forward and get more diagrams to find issue. If i simulate ignition relay then im getting communication with ECU via OBD but Dash still death, I can simulate as well after starter relay but of course will not fire as no communication with other modules ECU - BCM - DASH - KEY

Did somebody solve this simillar issue.

Regards
Arek

[aliS]

Hello Everyone.

I have VW Touran 2012 1.6TDi with excatlly the same issue like VW CADDY 1.6 above.

1. No ignition, No cranking, no starting.
2. DASH - no light up complete dead / but tested on bench working fine.
3. No communication with any modules / but on bench no problem example with ECU PCR1.6 or Dash
4. Nothing happened when ignition on or key in ignition. / only working remote
5. Working only radio
6. Tried new set ECU, BCM, Fuse box under bonnet, dash, Can module, ignition barrel, squib module / still no communication
7. download diagram from VW ERWIN / check all wiring im in point that i not getting ignition 12v via relay from BCM

Wants to go forward and get more diagrams to find issue. If i simulate ignition relay then im getting communication with ECU via OBD but Dash still death, I can simulate as well after starter relay but of course will not fire as no communication with other modules ECU - BCM - DASH - KEY

Did somebody solve this simillar issue.

Regards
Arek

Just thinking about this a bit more. The small voltage you get at ignition suggests one of:

1. It's a floating current from somewhere else which I think would remain if you remove B6
2. It is the remaining voltage after a high resistsnce joint between B6 and ignition has dropped 90% or so of volts in which case voltage at ignotion would go to zero when B6 removed.

Oddly whilst starting to run through the van I found 0.5v running on the red/yellow feeding into the steering module before the ignition switch. When I unplugged the instrument cluster this jumped to 5.8v. Bearing in mind the instrument cluster is completely dead I’m left scratching my head as if it was a fault to earth with the cluster surely I’d have 12v back at red/yellow when disconnected or nothing at all. Connector for cluster seems fine with no shorts there.

Update: I charged the battery as the van had been sitting for a few months now and the red/yellow voltage is 11.9 with cluster removed and 0.5 fitted. So I guess it’s a complete cluster failure.

[aliS]

Wasn’t the cluster after all - came back no fault found.

[aliS]

ISSUE RESOLVED:

After finally getting some annual leave I managed to get stuck into the van, the first time since the instrument cluster came back with no fault found.

Having recharged the battery I started looking again, with 12v remaining at red/yellow feed at steering module with out instrument cluster and dropping to 0v with instrument cluster plugged in.

Measured resistance from SB 6 supplying fuse in engine compartment to cluster/steering module with cluster removed read 0.5 M ohms. Removed dash and hunted for cable damage. Eventually cut the red/yellow where it passed through bulkhead and measured either side with high resistance between fuse box and bulk head. Unwilling to completely remove the loom at this point to investigate I ran a new 5a cable and soldered/heat shrunk in. Rebuilt dash and van started, initially rough with various lights clearing after a few minutes.

Thanks to all for feedback especially VAG bound who really hit the nail on the head where to look.

Thanks,

Ali