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1999 S70NA Evita Current drain evaluation and fault testing

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

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abscate
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1999 S70NA Evita Current drain evaluation and fault testing

Post by abscate »

Symptom - car drained an old battery on a two week sit at college. I will get a new battery and test.

My Fluke $6000 VOM was on the fritz for some reason - I wasn't getting a reliable amperage reading, so I broke out the old Micronta

First, I played dead on road with no VOM and tried to troubleshoot with no instruments. I was a getting a thin blue spark on touching the negative to the battery post, indicative of 100s mA leakage - too much. I want to be under 50 mA (0.050 Amp)

First step - removed feed wire from positive battery post - no spark at negative - that means the alternator and diodes seem to be ok.

I went through the entire 11C fusebox (under the flip lid) trying to judge small spark (ok) from big spark but was unable to tell which circuit was pulling current.

I moved back to the big Butt Fuses feeding the Bus and found pulling number 6 cured all ills.

This feeds 5 buss circuits on the 11C, and I found #7 I could then tell big from small current drain. Said circuit feeds radio and a few other things. Pulling #7 makes drain current go from 200 mA to under 5mA

Current math - 200 mA draw will pull about 5 Amp hours per day from battery, or half battery charge in warm weather in one week.

When Abby comes home for long break, I will have a look at wiring and try to sort out - until then she will pull #6 when she parks.

Pictures to come.
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by RickHaleParker »

abscate wrote: Mon Oct 14, 2019 10:41 am My Fluke $6000 VOM was on the fritz for some reason - I wasn't getting a reliable amperage reading,
Semi-melted fuse or intermittent open fuse ...?
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by abscate »

RickHaleParker wrote: Tue Oct 15, 2019 3:43 am
abscate wrote: Mon Oct 14, 2019 10:41 am My Fluke $6000 VOM was on the fritz for some reason - I wasn't getting a reliable amperage reading,
Semi-melted fuse or intermittent open fuse ...?

I think it’s more serious. I’m getting about 200 mA reading with the leads grounded. Bad battery perhaps, but it’s under warranty at least.

On a bright note, Juniorette had a good head for electrical troubleshooting and was able to figure out how to track down a current leak and what order to pull fuses.
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by RickHaleParker »

abscate wrote: Tue Oct 15, 2019 4:41 am I think it’s more serious. I’m getting about 200 mA reading with the leads grounded. Bad battery perhaps, but it’s under warranty at least.
You sure it is 200 mA not 200uA or 200 pA? A little internal leakage is expected but not 200 mA.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by abscate »

I gotta hand it to my almost 40 year old Radio Shack Micronta VOM, workingout of box, and the analog meter was great for catching the dynamics of the current drain.

Each time you connect the battery, a couple of controllers reboot so current jumps, then drops and stabilizes. Much easier to diagnose on an analog meter.

You also never need a battery on an analog current meter

:D
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by abscate »

Oh... and by the way, this circuit also powers the d****** dome light and lock controller module that has been poking us in the eye for a year.

Hmmmmmm
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by abscate »

And this was found to be a faulty passenger door switch lock button stuck closed.

Once resolved, drain current measures at 45 mA. Probably still some stuff active at that point
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by wizechatmgr »

abscate wrote: Sat Mar 21, 2020 6:27 am And this was found to be a faulty passenger door switch lock button stuck closed.

Once resolved, drain current measures at 45 mA. Probably still some stuff active at that point
Unplug your radio. Bet at least half of it is the memory refresh power. Betting other half is ECU/ECM memory refresh.
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by 850 LPT »

abscate wrote: Sat Mar 21, 2020 6:27 am And this was found to be a faulty passenger door switch lock button stuck closed.

Once resolved, drain current measures at 45 mA. Probably still some stuff active at that point
I am glad you figured this out.
Since I have the exact same symptoms with my S70 I am hoping that the cause is the same.

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96' 850 sedan, base, auto, pewter/charcoal, 117k miles
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Re: 1999 S70NA Evita Current drain evaluation and fault testing

Post by abscate »

Well, it solved it for 5 days , then came back
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