Speedo reverting to mph

flower tattoo · 31-12-2010 3:16pm #1

So, I've got a digital display on a 04 Suzuki liana. I've had it 4 years but noticed this January that if the night time temperature goes below about -8 the speedo in the morning will have changed from kph to mph. I can change it back and it will hold until the next very cold night. It happened there again in December every morning for a few weeks, now temps have risen it's back holding kph again.
Car is running fine and it's not a major issue but I just wondered why

shamwari · 31-12-2010 4:12pm

Is the battery in your car ok? If it's weak, the effort taken to crank the car at those low temps might cause the power to drop low enough to cause your dash to forget its settings and revert to their defaults.

bmw535d · 31-12-2010 4:13pm

ill take a stab at this, could it be the frost effecting your battery, which would lower the voltage's making your car think the battery was removed or gone flat, so it reset's itself to factory settings? did you have to reset the time on the car aswell? if it has a clock?

bmw535d · 31-12-2010 4:16pm

dammit, beaten to it, i envy your ninja posting skills...

flower tattoo · 31-12-2010 4:27pm

Clock is fine and car started easily throughout cold mornings. It was changed before the engine turned over- just as I'd turned the key but before the engine fired. It first happened at the start of the year so if it was the battery is it likely I'd have got to the end of the year with it??

bmw535d · 31-12-2010 4:46pm

flower tattoo wrote: »

Clock is fine and car started easily throughout cold mornings. It was changed before the engine turned over- just as I'd turned the key but before the engine fired. It first happened at the start of the year so if it was the battery is it likely I'd have got to the end of the year with it??

yea id say there is a tiny blip in the power supply as all the unnecessary power draws are cut off to get the first crank of the engine over.

Speedo reverting to mph

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