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PostPosted: Sun Jun 09, 2013 8:48 pm 
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Joined: Sun Feb 10, 2013 12:53 pm
Posts: 56
Car Model: Saab 9-3 TTid Aero
I have recently fitted a Pioneer double Din head unit.
The problem is the dimmer function that operates when the lights are switched on doesn't always seem to work properly.

There is an icon in the head units menu that has either a moon or sun depending on whether you have the lights on at night (Moon with lights on, sun with lights off), and while parked the icon changes straight away if I turn the lights on and off.

However, in the daytime the head unit ALWAYS displays the moon icon and turning the lights on or off does nothing. This means I always have to manually adjust the dimmer on the headunit at night.

Is there something in the electrics that would stop the head unit from detecting that the lights are turned off during the day.
The headlights are Xenon's if that makes any difference

I just can't understand exactly what is happening.

Skiddins


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PostPosted: Sun Jun 09, 2013 9:16 pm 
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Joined: Tue May 15, 2012 7:07 pm
Posts: 1463
Location: Norfolk
Car Model: 08 93 TiD 150 Vector Sprt Vert
Has the HU got a parking brake sensor and is this bypassed or wired in?

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PostPosted: Sun Jun 09, 2013 10:10 pm 
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Car Model: Saab 9-3 TTid Aero
400ixl wrote:
Has the HU got a parking brake sensor and is this bypassed or wired in?


Yes and bypassed, I' wired it straight to ground so I could adjust display properties without the handbrake being on.

Skiddins


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PostPosted: Mon Jun 10, 2013 7:02 am 
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Joined: Mon Feb 19, 2007 4:12 pm
Posts: 6792
Location: Portsmouth
Car Model: 96 V4 & 9-3 Turbo-X
Is the feed for the lights connected to the instruments or the headlamps?

Do either of these come on during the daytime? Day running lights for example? Are the dash lights on all the time (even just dimmed during daylight to the point you can't see them would be enough to give the HU a signal).

If so, then it will always think it's night (lights on) and dim the screen.

Sounds like there is a problem with the signals the HU is receiving from the car, and that the signals change when the handbrake is on vs off. Does this affect the DRLs?

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'02 9-3 Convertible (Dead)
'75 96 V4 Anniversary Restoration Project
'09 9-3 Turbo-X Wagon No. 38


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PostPosted: Wed Jun 26, 2013 3:39 pm 
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Joined: Fri Mar 15, 2013 6:50 pm
Posts: 40
Location: Burton on Trent
Car Model: 2011 Aero TTID Auto
Skiddins wrote:
I have recently fitted a Pioneer double Din head unit.
The problem is the dimmer function that operates when the lights are switched on doesn't always seem to work properly.

There is an icon in the head units menu that has either a moon or sun depending on whether you have the lights on at night (Moon with lights on, sun with lights off), and while parked the icon changes straight away if I turn the lights on and off.

However, in the daytime the head unit ALWAYS displays the moon icon and turning the lights on or off does nothing. This means I always have to manually adjust the dimmer on the headunit at night.

Is there something in the electrics that would stop the head unit from detecting that the lights are turned off during the day.
The headlights are Xenon's if that makes any difference

I just can't understand exactly what is happening.

Skiddins



I had the same, take the orange dimmer wire from the head unit and wire this to the cig lighter illumination wire, will dim off and on with lights. For some reason the car loom to orange dimmer is permanently live so the dimmer function does not work on after market unit.

Pull the ashtray out (clip on left to release) and feed the wire around the back to the head unit, 5 minute job


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PostPosted: Wed Jul 10, 2013 4:47 pm 
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Joined: Sun Feb 10, 2013 12:53 pm
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Car Model: Saab 9-3 TTid Aero
masonic wrote:
I had the same, take the orange dimmer wire from the head unit and wire this to the cig lighter illumination wire, will dim off and on with lights. For some reason the car loom to orange dimmer is permanently live so the dimmer function does not work on after market unit.

Pull the ashtray out (clip on left to release) and feed the wire around the back to the head unit, 5 minute job


Is there a way of wiring it so it's only triggered as 'lights on' when the main lights are turned on, not just the side lights as well?

Skiddins


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PostPosted: Wed Jul 10, 2013 7:07 pm 
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Joined: Mon Feb 19, 2007 4:12 pm
Posts: 6792
Location: Portsmouth
Car Model: 96 V4 & 9-3 Turbo-X
No, as the dash illumination is turned on with the side lights.

Unless you ran a wire from the main headlamps.

_________________
'02 9-3 Convertible (Dead)
'75 96 V4 Anniversary Restoration Project
'09 9-3 Turbo-X Wagon No. 38


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PostPosted: Wed Mar 16, 2016 10:08 am 
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Joined: Wed Mar 16, 2016 10:04 am
Posts: 1
Car Model: 9-3 Cab 2009
I'm staggered someone else has had the same problem.

I've been racking my brain for weeks.

The dim / no dim works in the evening(i.e. will dim when lights are one, but wont when they are off), but wont work during the day. It defaults to a dimmed state with a little moon on the settings. I wondered if there was some sort of internal clock in the car that was telling it it was nighttime when it wasnt.

Anyway, I will try connecting the orange to the cigarette lighter power at the weekend.

Does anyone know which is the live on the cigarette lighter?


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PostPosted: Sun Jan 08, 2017 1:33 pm 
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Joined: Sun Sep 25, 2016 5:47 pm
Posts: 157
Car Model: 9-3 Aero TTiD convertible auto
Just wanted to say thanks for this.

I also had the same problem with my AVIC F77DAB.

Connected the orange/white wire to the live feed for the cigarette lighter illumination.

It's the little single connection that goes to the bulb. Very easy to spot.

My dimming now works properly!


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