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PostPosted: Wed Sep 16, 2020 8:09 pm 
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Joined: Wed Sep 16, 2020 7:35 pm
Posts: 6
Car Models: Saab 9-5 2.0t biopower
Dear Saab folk.

I have a Swedish 2007 9-5 2.0t biopwer, 150hp.

Issue: When I turn my side lights on, both xenon dipped beams start flickering.

It all started when I took car for MOT.
All lights working when we leave home, arrive at test station, and dipped beams not working.
Side lights ok, high beams ok.

Check and change fuses, check and swap relays, but no lights.
Get home and check bulbs, they don’t look so good so I replaced them.
Still no dipped beam.

One of the xenon controll units circuit board looked burnt with a component.
So I purchased new xenon controller units and fitted.

Excellent- dipped beams working great, high beams good.

Then I switch to side lights and go check.......the low beam xenons are flickering :wall: :cen:

Help ! It’s really :cen: me off, what do you wise Saab folk think can be the problem

Thanks and best regards // Adrian.


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PostPosted: Thu Sep 17, 2020 7:04 am 
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UKS Addict

Joined: Thu Sep 01, 2005 5:31 am
Posts: 5504
Location: Bucks
Car Models: Saab NG 9-5 Aero
Check the light switch.


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PostPosted: Thu Sep 17, 2020 7:41 am 
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Light Pressure Turbo
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Joined: Tue Jan 15, 2013 7:20 pm
Posts: 586
Car Models: 2006 9-5 2.3 HOT Aero Estate
Check your wiring and your earths. It could be a short somewhere. Wiring diagrams and fault finding section of WIS may help narrow the search.


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PostPosted: Thu Sep 17, 2020 9:07 am 
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Joined: Wed Sep 16, 2020 7:35 pm
Posts: 6
Car Models: Saab 9-5 2.0t biopower
Hi Good Saab Folk.

Thanks for the advice.

When checking the headlamp switch, is there anything in particular i should look for??

I'm going to check earths and wiring this weekend......lets see what I find.

thanks again, // Adrian.


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PostPosted: Thu Sep 17, 2020 9:08 am 
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Joined: Thu Sep 01, 2005 5:31 am
Posts: 5504
Location: Bucks
Car Models: Saab NG 9-5 Aero
Having read this several times I have many questions.
1. I assume that you are moving the light switch from Off to Sidelights and at that point the Xenons flicker?
2. Is everything OK with the light switch at Headlights?
3. Have you tried tapping the light control relays with a screwdriver handle while the lights are flickering? Does the flickering stop and the lights go out?


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PostPosted: Thu Sep 17, 2020 9:20 am 
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Joined: Wed Sep 16, 2020 7:35 pm
Posts: 6
Car Models: Saab 9-5 2.0t biopower
Hi GeoffR.

Yes, I'm moving the switch from left position to centre (side lamps) and Xenons flicker.
I then move switch to right and low/high beams work ok with no flickering.
Switch back to centre and flickering starts again.

As the car is a swedish vehical, the low beams are "on" when the switch is in the left position.

No I haven't tried tapping relays, it was almost dark and getting late.
Thought I'd ask for help before taking another look.

I haven't checked cleaned earths, but will over weekend.

I've checked the condition of the plugs/wires at the headlamps and seems OK, no corrosion or signs of overheating/melting.

Anything in particular to look for on headlamp switch??

Regards // Adrian


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PostPosted: Thu Sep 17, 2020 10:51 am 
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UKS Encyclopædia G-M
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 42205
Location: SW Herts
Car Models: 2007 9-5 Aero est. 300hp Hirsch. 9-3 2010 9-3 Carlsson
I had this problem. It was nothing to do with the switches. It was corrosion in the rear level sensor causing a short. This allowed the controlling variable frequency pulse to migrate into the light circuit which caused the headlamps to flash when the ignition was on, but they were OK when fully on.

The sensors are powered by fuse 4 in the fusebox under the bonnet. Pull this fuse out and see if the flashing stops. If it does, you will need to sort one or other of the level sensors.

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Everything will be OK in the end. If it's not OK, it's not the end...


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PostPosted: Thu Sep 17, 2020 11:07 am 
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UKS Encyclopædia G-M
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 42205
Location: SW Herts
Car Models: 2007 9-5 Aero est. 300hp Hirsch. 9-3 2010 9-3 Carlsson
Found some pictures...

https://youtu.be/YrqCFnJ392k

The white spot is the corroded end of the pin from the sensor which has broken off and "welded" itself inside the connector in the loom. I needed to crimp a new connector and fit a new rear sensor to sort it. If the fault is in the front sensor, that can be disconnected by a connector near the purge valve attached to the MAF sensor. The sensor has a short length of loom. The rear has no connector; its connection wire crosses from the right of the car to the left and through a grommet into the car under the rear seat.

Attachment:
P1000879.jpg
P1000879.jpg [ 58.6 KiB | Viewed 276 times ]

_________________
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Everything will be OK in the end. If it's not OK, it's not the end...


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PostPosted: Thu Sep 17, 2020 12:02 pm 
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Joined: Wed Sep 16, 2020 7:35 pm
Posts: 6
Car Models: Saab 9-5 2.0t biopower
Thanks SGOULD.

I'll check this out as well.

From memory, the front levelling control plug is held on by a zip tie !

We have only had the car a short time (weeks); bought it cheap for our daughter........now I maybe know why :mrgreen: :park: :park:

Thanks again for the tip.

I'll check and post back.

Regards // Adrian.


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PostPosted: Fri Sep 18, 2020 6:13 pm 
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Joined: Wed Sep 16, 2020 7:35 pm
Posts: 6
Car Models: Saab 9-5 2.0t biopower
Dear Saab Folk.

So to recap, dipped beams stopped working.

I replaced the bulbs with new ones, also changed the xenon ballast controll boxes (with new parts) attached on the side of lamp units.

This gave me working low beams again.

However, switching to side lights/parking lights the xenons start flickering.

Today I have done the following to try and fix problem :

1. Cleaned earth points by battery ( 2 locations), checked all fuses again. Ok.

2. Tried tapping low beam relay (clicks as lamps flicker) but does not help. Swapped them around again, same clicking, no joy.

3. Changed headlight switch on dash - no chg, still flickering.

4. I then changed the front xenon levelling control unit (with brand new part) on the control arm by the front wheel; did not fix problem.
There was no sign of corrosion on cable at plug, or connector in engine bay.

5. I also changed the rear xenon levelling control unit with a brand new part. Lights still flickering.

I have also noticed the the lamps do not seem to move up/down when you put low beams on :park:

I was feeling rather down and :cen: off again. After dinner had a search for solutions again.

I found a polish clip. There advise was to isolate pin 87a (centre pin) on the low beam relay.

I've tried this :o and to my suprise the flickering stopped !!

I dont like this quick fix, doesn't seem right. Xenons are also not moving up/down when you put light on.

PLEASE Any other ideas??

best regards, // Adrian


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PostPosted: Tue Sep 22, 2020 1:28 pm 
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Joined: Wed Sep 16, 2020 7:35 pm
Posts: 6
Car Models: Saab 9-5 2.0t biopower
Dear Saab Folk. :mrgreen:

So still haven't solved the problem with flickering parking/side lights.

I've spent some time looking thro Swedish forum pages.

There I found info from WIS.

If you change the xenon levelling sensors, there is no need to have any calibration performed.

However, if you have changed the xenon control units/balast box on side of lamps; they need to be calibrated.

I have a icarsoft pro reader, but cannot perform this task.

It has to be done using a TECH2 reader.

Not having access to a TECH2, I've had to book the car into a local workshop.

br // Adrian.


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PostPosted: Wed Sep 23, 2020 11:59 am 
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Light Pressure Turbo
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Joined: Tue Jan 15, 2013 7:20 pm
Posts: 586
Car Models: 2006 9-5 2.3 HOT Aero Estate
Adrian, have your tried looking for a TechII owning forum member near you? I'm in Herefordshire with one if it's any help, but there are plenty dotted about the country.


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