Help - weird dash light behaviour

[Davep24]

hi, been having some problems with my backlights on the dashboard, basically when the headlights are off, the backlights for the dash, A/C buttons and the stereo buttons are illuminated. When i turn the lights on all these lamps go out.

the dimming controls has no effect

The green displays are all lit but the the only one that dims is the stereo.

Could this be symptoms of the BCM dying?

Any help would be greatly appreciated

[ARAF]

Could be the battery dying. Disconnect and leave for 10 minutes before reconnecting, and it should reset.

[Davep24]

thanks for quick response, battery is good (12.5V) and already had it disconnected for 20 minutes. Problem is still there

[ARAF]

Davep24 said:

thanks for quick response, battery is good (12.5V) and already had it disconnected for 20 minutes. Problem is still there

12.5V Is that nominal, or while charging?

[MadMaxHSV]

Battery.
Dash does all sorts of weird st when the voltage is only a little bit low.

[Davep24]

nominal, its over 14 when charging

[ARAF]

Davep24 said:

nominal, its over 14 when charging

Then I agree, battery should be fine. Shame, as that would be an easy fix.

[MadMaxHSV]

Check all the fuses under the dash.
Failing that I'd still try another battery if you've one to try

[ARAF]

MadMaxHSV said:

Check all the fuses under the dash.
Failing that I'd still try another battery if you've one to try

Yeah, it was my first thought too, and probably what I would look at if the battery is more than 3 years old, or been left for long periods of time.

[Davep24]

just been doing some searching and it appears something similar has happened before

http://www.hsv.org.uk/topic.asp?p=1&f=69&t...

going to check he fuses tomorrow


MadmaxHSV you mentioned in this post that your light packed up to, probably while fitting a wideband, Guess what i have fitted recently! I took the power from a connector under the stereo. Did you have to replace the BCM?

PS, i have just turned the rheostat down and the stereo lights illuminate when the brightness is low

[Black VXR]

what car please?

[MadMaxHSV]

Davep24 said:

just been doing some searching and it appears something similar has happened before

http://www.hsv.org.uk/topic.asp?p=1&f=69&t...

going to check he fuses tomorrow


MadmaxHSV you mentioned in this post that your light packed up to, probably while fitting a wideband, Guess what i have fitted recently! I took the power from a connector under the stereo. Did you have to replace the BCM?

PS, i have just turned the rheostat down and the stereo lights illuminate when the brightness is low

Then you likely have the same problem I did. For me in the end it was a fuse that popped. Didn't make sense at the time because as you say the lights half work but that's all it was.

[ARAF]

Black VXR said:

what car please?

OP has a 2004 CV8