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

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
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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?


1998 V70 GLT Black/Beige 193k
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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!


1998 V70 GLT Black/Beige 193k
2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
1995 850 collection of parts... crushed... still have parts, PM if interested!
1988 744 Turbo M46 Beige Metallic/Beige 188k- Still kicking myself for getting rid of this one

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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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bmdubya1198
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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?


1998 V70 GLT Black/Beige 193k
2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
1995 850 collection of parts... crushed... still have parts, PM if interested!
1988 744 Turbo M46 Beige Metallic/Beige 188k- Still kicking myself for getting rid of this one

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