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ABS/STC module S80

posted by thisguy on Mon Jun 23 03:33 CST 2003
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Someone posted a message stating that they had opened the /STC module with a Dremel tool. Can anyone please provide dedtailed instructions on how to open the module to inspect for the solder problem? I have one in my car and one in my hand. I purchased a used one from a parts dealer and it resolved my problem for a while, but the light has now returned.

Thanks in advance.

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ABS/STC module S80

posted by jda2000 on Mon Jun 23 14:04 CST 2003
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last visit: Sun Jan 1 21:27 CST 2012

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I remember reading the post a few weeks ago, someone opening the ABS module with a dremmel and looking inside at the small circuit board with a magnifying glass He found a couple of areas with broken solder. He resoldered those areas, and sealed the box with silicone and his problem was solved. This reminds me of the common failures of the fuel pump and overdrive relays secondary to poor soldering, in the 240/740.

Since you have an extra one, take a chance and open carefully with a dremmel. Buy a good magnifying lamp and check the circuit board solder and resolder or clean those solder points. You have nothing to loose, and about $800 to save.

Please post back on the success or failure of your project.
--
'88 240, '92 740, '98 v70 GLT John in Tampa Bay

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ABS/STC module S80

posted by vitor on Mon Jun 23 07:45 CST 2003
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last visit: Sat Dec 8 05:01 CST 2007

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I'm the one that repairs the controllers.
I have repaired about 6 for members of this board.
I received one controller last Saturday that was opened with a screwdriver, or something similar. The unit is probable damaged beyond repair now.
The dremel will get the box open, but sealing will be a challenge.
To work in the circuits you need at least a 10X magnification loupe and a heat controlled soldering iron, not to mention good pulse.

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ABS/STC module S80

posted by someone claiming to be Frank on Mon Jun 23 06:50 CST 2003 [RELATED]

IMHO, don't waste your time trying. I've read that story before too (with 850s/X70s) and I've opened up a couple of them BEFORE they had to returned for a core (money back for you).
Once opened, you'll see VERY small circuitry (too small for ANY soldering gun I've used) and it's got a gel coating covering it for water-proofing too.
I've questioned this rumor before here and not one experienced person has told me what exactly one's looking for, re-solding. With the naked eye, you won't see anything visably wrong with it.

If you're buying a Volvo part, there is now a core charge so they'll want the old one back, un-opened. I don't advise opening it.

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ABS/STC module S80

posted by gr78core on Mon Jun 23 08:26 CST 2003
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last visit: Wed Jul 3 07:15 CST 2002

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Not true. There is no core charge with the 99 S80 module. There is no gel sealing the PCB. I opened my module (dremel tool) and inspected the soldering with a magnifying lense and found the solder bridge on the QFP, Quad Flat Pack , (Square shaped component) in the center of the board. I believe the contacts on the connector outside the module are also important for reliability and should be cleaned and coated (contact cleaner) to prevent the intermittent problem. It is worth a try to avoid the $800 price tag for a new module. Try the connector contacts if your used replacement is also causing the message. There is no reason they sealed this unit that I can see except maybe to make it difficult to get into the module. There is no moisture seal or conformal coating. Unless you submerge your car in a lake to this level, how is it a problem. I resealed mine around the border with tape and it has lasted 3 months without the error message.

I'd be curious to know what the repair involves by the individual that does this as a sideline business. What is he finding as a repairable problem? Unless you have the test capability to find defects and to functionally test the module, it is a stab in the dark to find problems.

GR

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ABS/STC module S80

posted by someone claiming to be Frank on Mon Jun 23 17:04 CST 2003 [RELATED]

OK, I havent opened an S80 ABS control unit BUT I have opened 2 X70 control units and they were exactly as I said before, sealed with a clear, rubber type gel coating. The S80 units look the same to me on the outside.
At my dealership, they're now ALL to be returned and there is a core charge or else someone pays (service department in my case).

I could also check but the price is probably less than $800. They're $416 for X70s new.

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ABS/STC module, more S80

posted by someone claiming to be Frank on Tue Jun 24 04:03 CST 2003 [RELATED]

Turns out that my parts dept's been hosing us, NO core charge afterall for S80 ABS units but I have yet to see one that's not warranty so no oportunity to open one up yet. They also do cost $800 (ouch).
If it looks like the older 850/X70 types on the inside, one would need to be pretty good with a small soldering iron, an electronics type that I've never seen. The typical home/auto repair types would never cut it IMO.

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