Hi guys,

For some strange reason the time keeps changing on my clock on the dash. It's done it for a while, a few minutes out either way here and there. Today I noticed as I was driving it did it - it just started climbing through the numbers and ended about 30 mins out.

Any ideas? The battery is relatively new, good quality and never hesitates so I can't see it being that.

Cheers

Liam

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The Flux Capacitor's on it's way out. Replace and top up the Mr. Fusion power source with some fresh banana skins

^

Does it definitely go in both directions, gaining and losing time?

 

If it were always one way, I might have an explanation, but not if it is both.

Do you have an aftermarket stereo head unit? Maybe check the wiring out?

Does it definitely go in both directions, gaining and losing time?

If it were always one way, I might have an explanation, but not if it is both.

When I say it's going in both directions I mean I think the minutes is going forward but sometimes it appears like it's gone back because the minutes have gone past the hour but the hour hasn't increased by one. It's very bizarre.

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Do you have an aftermarket stereo head unit? Maybe check the wiring out?

Everything is as standard mate. It's the SE VRS (07) just in case that somehow sheds some light haha.

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When I say it's going in both directions I mean I think the minutes is going forward but sometimes it appears like it's gone back because the minutes have gone past the hour but the hour hasn't increased by one. It's very bizarre.

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So it's as if you're twisting the adjuster peg clockwise when you're not?

 

There are a couple of little click-switches on the instruments PCB that get operated by twisting that peg, one for clockwise, the other for anticlockwise.  A common circuit arrangement for such a switch to act as a digital input to a microcontroller circuit looks like this; where the input pin is normally 'pulled-up' to a supply voltage level, but forced down to 0V when the switch is pressed.  If that pull-up resistor had a failing solder joint at one end or other, it might sometimes behave as if it isn't there at all. This would let the voltage level on the input pin of the micro wander around uncontrolled, sometimes triggering a 'minutes adjust' sometimes not. I'll have a look at some clocks I've got in bits later, and see if I can find the relevant resistor.

The little click-switch might also be the problem, but I'd think it's more likely that would fail in a way that meant it never worked, rather than worked on its own.

#8 makes sense to me too. In particular the point about it only affecting the minutes, since the design behaviour of the control is twist right for minutes increment, twist left for hours increment. 

 

I'd also wondered if the switch was possibly sticking slightly right of centre, and vibration causing it to activate.

I forgot to take the dis-assembled clocks home with me last night so couldn't look into this any further.  As far as I know my lunch-hour today is available though.