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[TheBoy]

side lights and headlights off and Ign on = MID, Climate displays and amber LED on the gear selector = lights on as normal

Turn headlight switch to side lights and dipped = MID and vent illumination on as normal, no switch lights on the climate panel, no instrument panel lights, and the amber LED on the gear selector goes out but the back light does not come on.

The dimmer has no effect at all during any of this.

edit: the climate displays are on with the headlight switch on as normal

Sorry for the constant queries to clarify, just trying to get straight in my head.

So are we saying that:

Climate remains identical whether lights on or off
Radio remains identical, lights on or off
Instrument remains identical, lights on of off

ie, its as if the lights are never on?

[Ratty]

yep, I think that's about right, it's as though nothing controlled by the dimmer is working, although saying that someone said earlier that their MID and climate displays dimmed with the dimmer, which if that's correct then it confuses matters even more.

[Dave DND]

Could it be that by fitting an incorrect switch that you have blown a track somewhere on the dash lighting circuit?

Not sure how sensitive Omegas are to this, but I see a lot of VAG dash`s after botched attempts at radio installs with similar fault conditions?

 :-/

[Ratty]

this is where I get confused, because Vauxhall say it must be the same Ident number but other users say they have swapped switches and so long as they have the correct switches (fogs, leveller etc) then it should work, I do know that the dimmer is electronically controlled and not just a plain rheostat.

[TheBoy]

yep, I think that's about right, it's as though nothing controlled by the dimmer is working, although saying that someone said earlier that their MID and climate displays dimmed with the dimmer, which if that's correct then it confuses matters even more.

OK, gone through the wiring diag. Can you go through following answers with Yes/No?

1) Are you saying the only change (with engine running) between lights on and lights off is the gearbox indicator (the led, not the backlights) dims?

2) Can you check that none of the backlights for the switches below climate panel come on (may need to wait for nighttime, as wont see in daylight)

3) Cigarette lighter surround, is that on with lights

4) rear lectric window switches, do they come on with lights


Sadly, I think I know where we are heading with this 

[TheBoy]

this is where I get confused, because Vauxhall say it must be the same Ident number but other users say they have swapped switches and so long as they have the correct switches (fogs, leveller etc) then it should work, I do know that the dimmer is electronically controlled and not just a plain rheostat.

Correct, the dimmer is IC controlled. However, I think your dealers are simply reading off EPC and, unstandably, not using any common sense.

[Ratty]

yep, I think that's about right, it's as though nothing controlled by the dimmer is working, although saying that someone said earlier that their MID and climate displays dimmed with the dimmer, which if that's correct then it confuses matters even more.

OK, gone through the wiring diag. Can you go through following answers with Yes/No?

1) Are you saying the only change (with engine running) between lights on and lights off is the gearbox indicator (the led, not the backlights) dims?

2) Can you check that none of the backlights for the switches below climate panel come on (may need to wait for nighttime, as wont see in daylight)

3) Cigarette lighter surround, is that on with lights

4) rear lectric window switches, do they come on with lights


Sadly, I think I know where we are heading with this 

1) LED on but no dimming

2) No only lighting on the climate switches is bleed from the display bulbs

3) no

4) No

[TheBoy]

yep, I think that's about right, it's as though nothing controlled by the dimmer is working, although saying that someone said earlier that their MID and climate displays dimmed with the dimmer, which if that's correct then it confuses matters even more.

OK, gone through the wiring diag. Can you go through following answers with Yes/No?

1) Are you saying the only change (with engine running) between lights on and lights off is the gearbox indicator (the led, not the backlights) dims?

2) Can you check that none of the backlights for the switches below climate panel come on (may need to wait for nighttime, as wont see in daylight)

3) Cigarette lighter surround, is that on with lights

4) rear lectric window switches, do they come on with lights


Sadly, I think I know where we are heading with this 

1) LED on but no dimming

2) No only lighting on the climate switches is bleed from the display bulbs

3) no

4) No

1) The LED should always be one, had a feeling it dimmed to a set (unrelated to dimmer setting) level with lights on. back lighting around the panels each side of gearstick is controlled by dimmer.

[Ratty]

1) the LED is on with engine running until I turn the lights on then it goes out, I thought it would have - as you say - dimmed to a certain point to blend in with the back-lighting

[Dave DND]

Is there anywhere that you could inject a 12 Volt feed to test the lighting circuit ? Ciggy lighter maybe?

[Ratty]

tried that earlier, was told that pin 58d was the dimmer control circuit put a 12v feed to that and the bridge wire started to get warm so disconnected it before any damage was done

[Dave DND]

tried that earlier, was told that pin 58d was the dimmer control circuit put a 12v feed to that and the bridge wire started to get warm so disconnected it before any damage was done

I was thinking more along the lines of connecting directly to a bulb, so that you could eliminate any control circuitry in the test and to make sure that the circuit itself was free from shorts and illuminated.

At least that way you could track backwards to see at which point you are losing the supply voltage

 :-/

[TheBoy]

One last little test. Do the rear fog lights work (engine running, lights on, rear fogs on)

[TheBoy]

One last little test. Do the rear fog lights work (engine running, lights on, rear fogs on)

Or the front fogs as well

[Ratty]

One last little test. Do the rear fog lights work (engine running, lights on, rear fogs on)

yes, they work as do the fronts