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1996 850 Battery Drain Overnight - Yellow Wire Problem

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

PeteB
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Year and Model: 1996 Volvo 850 Wagon
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PeteB

Re: 1996 850 Battery Drain Overnight - Yellow Wire Problem

Post by PeteB » Sun Nov 03, 2019 8:11 am

Thanks everyone, will check it out very soon.



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PeteB

Re: 1996 850 Battery Drain Overnight - Yellow Wire Problem

Post by PeteB » Mon Nov 04, 2019 2:44 pm

My son stopped by and we were in a rush so I just cut the wire but of course
the check engine light came on. I have to find my scanner to check out the code.
Going to pull the relay next and get a new one.



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abscate
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Re: 1996 850 Battery Drain Overnight - Yellow Wire Problem

Post by abscate » Mon Nov 04, 2019 4:12 pm

That will be an SAS code if you didn’t do the delete
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PeteB


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PeteB
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Year and Model: 1996 Volvo 850 Wagon
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PeteB

Re: 1996 850 Battery Drain Overnight - Yellow Wire Problem

Post by PeteB » Tue Nov 05, 2019 6:40 pm

I did the diode thing a few years ago and it worked with the yellow wire intact but tomorrow I'll see what the code is.



PeteB
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PeteB

Re: 1996 850 Battery Drain Overnight - Yellow Wire Problem

Post by PeteB » Mon Nov 11, 2019 6:53 pm

OK, we worked on it today and the relay is under the driver's side front fender near the
radiator. It is a large package with 3 connectors. It is obvious from inspection that the connector
toward the rear of the car goes to the SAS fan motor. I reasoned that if the relay is stuck removing
the rear connector is as good as fixing the relay in a car where the SAS is not working.
We measured current to the yellow wire just to confirm the problem, it was high, today it seemed
to measure 2 amps with the ignition off. Pulled the rear plug and it dropped to zero!
We soldered back the yellow wire and started it but still had the check engine light.
Hooked up the scanner, sure enough it was a SAS code, cleared it and it remained cleared.

One lesson here is to simply remove that rear connector if you measure high current on the
yellow wire, or your battery dies overnight and you want to test out this theory.

Our car is missing the engine splash guard and the connectors were filled with water - they face
up and tend to cup water.

Thanks again everyone for the help!



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