Xsara Picasso ABS & battery problems

[Huddsta]

Good evening

I’ve got a 56 plate Xsara Picasso. Owned it for 6 years during which time it has given me very little in the way of trouble.

The week before Christmas the ABS non-function warning appeared on the dash. I’d had this once before & traces it to a faulty wheel speed sensor. Replaced it, fault cleared, happy days.
I assumed this could be a similar case.

Within a couple of days later it wouldn’t start. Battery was flat as a pancake. Charged it up over night only for it to go down again within 2 days.
Popped a new battery on but had the same again.
I’ve done a drain test but only saw a draw of about 0.03a once everything settled down.

Last week a friend with a diagbox read the faults for me.
It showed 3 wheel sensors faults (which seems rather unlikely) and something about ‘main relay fault’.

Initial thought is that a relay to the ABS is sticking on.
I’ve had a poke about under the bonnet & read through dozens of forum posts but can’t locate said relay.

Can anyone offer any advice?

[Huddsta]

Does anybody ha r a pin out for the ABS plug?
There’s a multi page document of wiring diagrams hosted on a couple of sites but the pins don’t bare any resemblance to mine.

[GiveMeABreak]

Post or PM your VIN and I'll have a look for you.

[Huddsta]

Thanks - will do shortly

[GiveMeABreak]

Here's the ABS block main part Matt:
Click to Zoom Diagram

11: 9009 : K4 stability control / ABS variable damping diagnostic line bus
14: 9001A : Low Intersystem / Can bus
25: 9000A : High Intersystem / Can bus

20: 210A : stoplamps control
15: 9011A : Low Intersystem 2 Can bus
26: 9010A : High Intersystem 2 Can bus
10: 7011 : Right-hand front wheel speed signal
9: 7012 : Right-hand front wheel speed signal reference

19: 7031 : Right-hand rear wheel speed signal
8: 7032 : Right-hand rear wheel speed signal reference
17: 7021 : Left-hand rear wheel speed signal
6: 7022 : Left-hand rear wheel speed signal reference
5: 7001 : Left-hand front wheel speed signal
16: 7002 : Left-hand front wheel speed signal reference
1: M702A : earth 702

4: M702B : earth 702
23: 6739 : Vehicle speed info
21: 442 : Brake fluid level info
18: CM03 : engine fuse box + after ignition output
3: BF03 (to Maxi Fuse 3)
2: BF02 : maxi-fuse output service battery positive (to Maxi Fuse 2)

[Huddsta]

Thanks very much - will get on it in the morning (and hopefully avoid the snow this time)

[GiveMeABreak]

Matt - the ABS block is as below and is part number 4541 J5 for your information.

[Huddsta]

Thanks again.

All points to the ABS module. There’s a few at local breakers albeit with slightly different part numbers but it looks like they’re cross compatible.

[GiveMeABreak]

You need to watch them as there are completely different versions according to equipement ABS / ESP - so be aware - always replace with the same part or you will likely have issues - they are not all the same and will have to code anything different.