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20 July 2017 #1
- Join Date
- 10 Apr 2017
- Location
- Denham, England
- Posts
- 541
- Saab(s)
- 2011 2.0 9-5 Aero
NG 9-5 Earth points
It is well known that a number of modern cars can be very unforgiving of low battery charge conditions. The NG 9-5 is, apparently, not exempt from this problem.
One reason for the system to generate fault messages is high resistance in sensors and load components, motors, solenoids and lamps. While doing a routine check round the engine i decided to check the earth points, these are located around the front strut top mounts and on the bodywork between the radiator and the headlights. I also checked the battery earth connection.
Contrary to popular belief the battery terminals should be absolutely free of any contamination during assembly. By all means apply a thin film of suitable grease after assembly. The quoted torque value for the battery terminal bolts is 4.5 nM not 20nM both terminals were well below the WIS figure when I started.
Earth points similarly should be free of all contaminants when assembled, I disconnected one to find that this wasn't the case so I cleaned the earth point, ring terminal and nut before tightening it, I used 15nM. I checked all the other earth points and found the torque to be well below this figure.
Whether you are suffering from spurious fault messages or not, I would urge all NG9-5 owners to check the tightness of all the earth points and the battery terminals.Last edited by GeoffR; 25 July 2017 at 07:10. Reason: To correct the battery terminal torque value
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22 July 2017 #2
- Join Date
- 10 Apr 2017
- Location
- Denham, England
- Posts
- 541
- Saab(s)
- 2011 2.0 9-5 Aero
Having posted the above I paid another visit and took some photographs.
Note that one of the earth points that I found loose was the main body earth, where it connects to the battery. Obviously a loose connect here will affect everything electrical on the car.
The other image shows the earth points at the front strut top mount.
I hope this will help somebody to prevent an unnecessary trip to the dealer. It may even mean that you don't replace a perfectly good battery.
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25 July 2017 #3
Frank Administrator
- Join Date
- 30 Jul 2010
- Location
- USA - Netherlands
- Posts
- 7,901
- Saab(s)
- previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
I moved this over to the 9-5 NG forum as that's where most of the 9-5 owners hang out. But there is still a link in the Tech Talk forum where is was originally posted as this an issue that can be important for any Saab owner.
Thanks for the write-up and pictures.
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25 July 2017 #4
- Join Date
- 10 Apr 2017
- Location
- Denham, England
- Posts
- 541
- Saab(s)
- 2011 2.0 9-5 Aero
Thanks, I am working on a fuse chart and I may need some help, if anyone has a Diesel NG9-5 please get in touch.
The handbook gives location and function but doesn't give fuse values, my chart will have both but, as mine isn't a Diesel some of the fuses are missing so I don't know the ratings.
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25 July 2017 #5
Frank Administrator
- Join Date
- 30 Jul 2010
- Location
- USA - Netherlands
- Posts
- 7,901
- Saab(s)
- previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
There is a complete chart with fuses, their location, schematic and ratings in the Saab WIS. I can post that if it helps you out.
Example:
X51A Fuse Block - Instrument Panel - Usage Fuses
No. Device Name Device
Assigned
NameRating Description 1 1 F1DA Fuse 10 A K19 Suspension Control Module (F45) 2 2 F2DA Fuse 20 A K9 Body Control Module 3 3 F3DA Fuse 25 A K9 Body Control Module
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26 July 2017 #6
- Join Date
- 10 Apr 2017
- Location
- Denham, England
- Posts
- 541
- Saab(s)
- 2011 2.0 9-5 Aero
I have a copy of WIS so I will have a look but I haven't found the chart yet. I am also intending to provide more useful information, there are four fuses with the description "Body control module" which I assume are actually functions controlled by the module rather than power sources for the module.
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26 July 2017 #7
Frank Administrator
- Join Date
- 30 Jul 2010
- Location
- USA - Netherlands
- Posts
- 7,901
- Saab(s)
- previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
Fuse and relay info in the WIS is at: 3. Electrical System - Wiring harness and components - Electrical Center Indentification Views
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26 July 2017 #8
- Join Date
- 10 Apr 2017
- Location
- Denham, England
- Posts
- 541
- Saab(s)
- 2011 2.0 9-5 Aero
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