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Short to ground... where is it? Fuse 11A/8 Topic is solved

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bmdubya1198
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Short to ground... where is it? Fuse 11A/8

Post by bmdubya1198 » Thu Jun 06, 2019 2:35 pm

I've discovered that the problem that I've been chasing for months on my 2000 V70R is a short to ground on some power wire, but I don't know where. When I probe the 11A/8 fuse (in main fuse box, one of the larger fuses) against ground, it shows between 7-10 ohms if I have a door open. However, if I close all the doors, it climbs to open circuit.

I've already torn apart the whole harness between the main fuse box and the CEM/fuse box in the car, and the wire coming from that terminal is totally in tact. No wear that could be shorting it out. It seems that the wire is linked to something else within the CEM fuse box that's shorting to ground.

The interesting detail here is that the only time I'm seeing resistance to ground is when a door is open. For some reason I can't find a diagram for the door latches, but I'll continue looking. In the meantime, does anyone know what could be shorting out when a door latch goes into the open position?


2000 V70R Venetian Red/Charcoal M56 Swapped 190k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 107k
2007 XC90 V8 AWD Sport Titanium Grey/Black 158k
1993 944 Base Beige/Beige :mrgreen: 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


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Re: Short to ground... where is it? Fuse 11A/8

Post by abscate » Thu Jun 06, 2019 2:40 pm

The trigger wire for the door lights and lock module

Normally open, go to ground when door opens


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Re: Short to ground... where is it? Fuse 11A/8

Post by bmdubya1198 » Thu Jun 06, 2019 3:03 pm

That's probably it... now to find where that runs. Thanks!


2000 V70R Venetian Red/Charcoal M56 Swapped 190k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 107k
2007 XC90 V8 AWD Sport Titanium Grey/Black 158k
1993 944 Base Beige/Beige :mrgreen: 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

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Re: Short to ground... where is it? Fuse 11A/8

Post by wizechatmgr » Sun Jun 09, 2019 11:03 pm

bmdubya1198 wrote:
Thu Jun 06, 2019 3:03 pm
That's probably it... now to find where that runs. Thanks!
Goes to every door and other locations... Odds are the short is in a door...


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Re: Short to ground... where is it? Fuse 11A/8

Post by bmdubya1198 » Mon Jun 10, 2019 3:59 pm

So I checked my cousin's '99, and that's normal behavior. Turns out EVERYTHING I "found" is normal behavior. So I've hit yet another dead end.

The problem: ECM-6B00 and ECM--6300 (both intermittent short to ground/signal too low codes for the ETS light and CEL) will not go away. It seems I have about 30 ohms to ground on those wire in key position 2, so that could be the short. The questions here are 1- is that normal, and 2- if not, what could be the problem? I'm pretty sure this isn't a wiring issue, and the cluster is not the problem (swapped it, no difference). Is the ignition switch a possibility?


2000 V70R Venetian Red/Charcoal M56 Swapped 190k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 107k
2007 XC90 V8 AWD Sport Titanium Grey/Black 158k
1993 944 Base Beige/Beige :mrgreen: 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

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bmdubya1198
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Re: Short to ground... where is it? Fuse 11A/8  Topic is solved

Post by bmdubya1198 » Thu Aug 08, 2019 4:28 pm

I can consider this particular issue solved, I think. I replaced the B+ fuse box cable and scanned multiple times with VIDA, and the codes did not come back. Now only one code for the clutch sensor (which is because I haven't installed it).

Don't know why I didn't do this sooner!


2000 V70R Venetian Red/Charcoal M56 Swapped 190k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 107k
2007 XC90 V8 AWD Sport Titanium Grey/Black 158k
1993 944 Base Beige/Beige :mrgreen: 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

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Re: Short to ground... where is it? Fuse 11A/8

Post by abscate » Fri Aug 09, 2019 3:53 am

Did that cures your ECM codes or just the door short problem?


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bmdubya1198
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Re: Short to ground... where is it? Fuse 11A/8

Post by bmdubya1198 » Fri Aug 09, 2019 7:11 am

Just the ECM codes, I haven't figured out the door short issue. From what I can find, it seems that's normal activity for that circuit.

But who knows... is it normal to hear the lock motor sound when I shut the driver door? That's just something this car has always done and I found it a little weird... just thinking maybe it has to do with that possible short.


2000 V70R Venetian Red/Charcoal M56 Swapped 190k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 107k
2007 XC90 V8 AWD Sport Titanium Grey/Black 158k
1993 944 Base Beige/Beige :mrgreen: 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

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Re: Short to ground... where is it? Fuse 11A/8

Post by scot850 » Fri Aug 09, 2019 7:45 pm

The wiring harnesses are prone to cracking where the harness enters the door. Could be you have a wire that is shorting in there. I have had to repair 2 or 3 of these.

Neil.


2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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Re: Short to ground... where is it? Fuse 11A/8

Post by abscate » Sat Aug 10, 2019 3:35 am

bmdubya1198 wrote:
Fri Aug 09, 2019 7:11 am
Just the ECM codes, I haven't figured out the door short issue. From what I can find, it seems that's normal activity for that circuit.

But who knows... is it normal to hear the lock motor sound when I shut the driver door? That's just something this car has always done and I found it a little weird... just thinking maybe it has to do with that possible short.
I think that’s the mode where the car tries To lock doors but sees one of them I see open.

It does point to a wiring fault somewhere, but not necessarily in the door moving


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