Brakes: Another ABS thread.....

[El Padrino]

Originally Posted by Luxobarge

I can't share the wiring diagrams, it's a huge PDF file and I don't know how to do that. However, I downloaded it from a link on here somewhere ages ago, maybe someone has that link and can post it up again?

OK, so yes, I re-soldered ALL the pins you have circled in yellow, these are all the ones that go to the multi-plug and involve the power feed positive and negative (two pins for each) and the rest of the smaller ones are the feeds from the various sensors etc.

No need to do the ones circled in red, these are the feeds to the ABS pump motor, and are unlikely to be faulty. However, no actual harm in doing so as you're in there already, so long as your soldering skill is OK. On that subject, I only have a normal (temp controlled) soldering iron, nothing special, and didn't have a problem doing it, it's not that fiddly by modern electronics standards. I can very much recommend the use of fine guage leaded solder though, the modern lead-free solder is harder to use and requires more heat. Although it's not allowed, I bet there are ways of getting hold of leaded solder!

Hope that helps?

Hi Luxobarge, I've managed to get a copy of a 1998 V70 ABS wiring diagram now. On the soldering front, thanks for clarifying which ones you re-soldered. Did you remove the old solder first, then add fresh solder or did you just add more solder to the pins? I need to get a new soldering iron as my one is very very old. You can't change the tips on it or control the temperature. A new one will be useful for tackling other soldering jobs.

[Luxobarge]

Just added enough new solder to make the joints flow properly, but without leaving huge gobs of solder on each joint, and it's of course essential to make sure that no solder is bridging across pins.

Don't forget what I said about using fine guage leaded solder if you can, also I did mine under an illuminated bench-standing magnifying glass, so if you can obtain or borrow one of those it'll make the job even easier. Mine was one that my better half uses for sewing!

[El Padrino]

Originally Posted by Luxobarge

Just added enough new solder to make the joints flow properly, but without leaving huge gobs of solder on each joint, and it's of course essential to make sure that no solder is bridging across pins.

Don't forget what I said about using fine guage leaded solder if you can, also I did mine under an illuminated bench-standing magnifying glass, so if you can obtain or borrow one of those it'll make the job even easier. Mine was one that my better half uses for sewing!

Thanks Luxobarge. Found this solder in my tool box. Think it was given to me years ago by my brother-in-law. Will this do? Those old solder degrade over time? Says it has lead and looks a fine guage.

[Luxobarge]

Originally Posted by El Padrino

Thanks Luxobarge. Found this solder in my tool box. Think it was given to me years ago by my brother-in-law. Will this do? Those old solder degrade over time? Says it has lead and looks a fine guage.

Yes, that should be fine - it's exactly what I used, haven't got much left now though!

[El Padrino]

Originally Posted by Luxobarge

Yes, that should be fine - it's exactly what I used, haven't got much left now though!

Great, saves me hunting around for new solder. I've asked for a new soldering iron for a birthday present, other half rolled her eyes

What did you use to reseal the module and did you bother with adding back the clear membrane that covers the PCB?

[Bob Meadows]

I find a little more flux is useful even when pre-fluxed solder is used-clean the finished area.
If the membrane has been peeled away then you can just push it back into place.. I wipe the area lightly with a water repellent (GT 85 or similar) prior to the above.
A polyurethane adhesive/sealant is also useful to fasten the removed cover.. it can be cut away quite easily if you need to go back into the unit.

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A forum search on this subject will give the product name for the membrane originally used- not absolutely necessary though.
Good Luck.
Bob.