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XC90 keeps blowing fuse 11 (ECM, SRS, etc)

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
ritchiehicks
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ritchiehicks

XC90 keeps blowing fuse 11 (ECM, SRS, etc)

Post by ritchiehicks » Wed Jul 25, 2018 3:09 am

Hi,

I'm hoping that someone can help with an intermittent, difficult problem to pinpoint.

Last week, XC90 broke down whilst driving. All the dash went (everything including A/C, radio) and some other circuits. Checked fuses with multi-meter. Traced to and replaced fuse 11 (7.5A) and the car was fine.

A week later, fuse 11 blows again. Replaced it but kept on blowing. Pulled all relays under the bonnet, replaced the fuse, kept on blowing. Called RAC - couldn't fix it - recovered to garage 4 hours later.

Garage put a few fuses in this morning, and after a few popped, it eventually started.

So, this is an intermittent problem, which is going to be almost impossible to trace if it's not blowing fuses. Also made more complicated by the fact that a number of systems run off of this circuit.

I've checked basic wiring that I can see, no obvious signs of chaffing. Seems to be worse when very hot, could just be a coincidence.

Does anyone have any advice on where to start looking? I totally appreciate it's hard to diagnose a fault that isn't there all the time!

Thanks in anticipation.

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RickHaleParker
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Re: XC90 keeps blowing fuse 11 (ECM, SRS, etc)

Post by RickHaleParker » Wed Jul 25, 2018 5:45 am

Traced to and replaced fuse 11 (7.5A) and the car was fine.

That would be F11 in the passenger compartment. It is for:
  • Switch, passenger side airbag
    Supplemental Restraint System Module (SRS)
    Central Electronic Module (CEM)
    Rear Electronic Module (REM)
    Antenna ring/ignition switch illumination
This does not tell you where the problem is but it can save you time by not looking where it is not.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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SuperHerman
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Re: XC90 keeps blowing fuse 11 (ECM, SRS, etc)

Post by SuperHerman » Wed Jul 25, 2018 10:29 am

Check the related relays and shunts in the CEM.

RickHaleParker is the wiring master - maybe he can tell you which one to focus on.

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RickHaleParker
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Re: XC90 keeps blowing fuse 11 (ECM, SRS, etc)

Post by RickHaleParker » Wed Jul 25, 2018 3:05 pm

With intermittents, the biblical method is your best hope, seek and thou shall find. Wiggle wires and try induce the problem, visually inspect connectors and wiring. Of course seeking is all for nothing if you don't know what you are looking for ... you won't recognize it when you find it..
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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