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Discussion Starter · #1 ·
Does anyone have access to speedo loom diagram? Need to find out which wire is the illumination wire for the speedo?

Any help greatly appreciated
Ed
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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That wire is the illumination for interior switches etc, controlled by the instrument cluster.

It goes live when the lights are switched on.
 

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Discussion Starter · #4 ·
Do you know which wire is the signal for the illumination of the speedo only? Do I need to program via tech2 so ignition doesn't illuminate speedo or is it all off one wire?
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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Do you know which wire is the signal for the illumination of the speedo only? Do I need to program via tech2 so ignition doesn't illuminate speedo or is it all off one wire?
As far as I know, there isn't one. It is controlled internally by the instrument cluster.

The signal from the light switch goes to the cluster to tell it the lights have been switched on. The cluster then decides for itself whether it should illuminate or not, depending on the state of the ignition switch, door switches etc.
 

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Discussion Starter · #6 ·
As far as I know, there isn't one. It is controlled internally by the instrument cluster.

The signal from the light switch goes to the cluster to tell it the lights have been switched on. The cluster then decides for itself whether it should illuminate or not, depending on the state of the ignition switch, door switches etc.
By instrument cluster do you refer to the speedo unit itself? Or Is there another circuit board somewhere?
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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By instrument cluster do you refer to the speedo unit itself? Or Is there another circuit board somewhere?
Yes. The instrument panel controls the gauges and warning lights, as well as acting as inputs and outputs for data from the CAN bus.
 

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Discussion Starter · #8 ·
Yes. The instrument panel controls the gauges and warning lights, as well as acting as inputs and outputs for data from the CAN bus.
So the instrument panel controls the illumination lighting on all parts of the dash, not the dimmer switch? Can you program it with tech2 so the instrument panel won't illuminate from ignition and will only illuminate from lights on?
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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So the instrument panel controls the illumination lighting on all parts of the dash, not the dimmer switch? Can you program it with tech2 so the instrument panel won't illuminate from ignition and will only illuminate from lights on?
Yes - the dimmer switch just tells the instrument panel to increase or decrease the brightness of the illumination.

I seem to remember that there could be an option in TECH2 to change how the illumination behaves when the ignition is switched on. Could be wrong though...
 

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Discussion Starter · #10 ·
Yes - the dimmer switch just tells the instrument panel to increase or decrease the brightness of the illumination.

I seem to remember that there could be an option in TECH2 to change how the illumination behaves when the ignition is switched on. Could be wrong though...
Do you know of any tech2 guys out suffolk way? I have got a project going on but seem to have hit a brick wall and need some info. Need to see how tech2 can alter the illumination.
 
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