Speedo & RPM not working sc400 - Club Lexus Forums


Speedo & RPM not working sc400

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Old 09-11-11, 06:59 PM   #1
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Default Speedo & RPM not working sc400

So a few days ago the speedo and RPM meter stopped working. Everything else works fine and the dash still lights up, but the two just doesn't move.

Someone had told me it was the ignitor

looks like this



but im kinda doubting it... Ive searched around and there hasn't been a lot of answer to this. Anyone have any clue?
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Old 09-11-11, 07:32 PM   #2
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Try slapping the dash above the cluster. My 92 sc400 does the same thing and slapping the dash does the trick.
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Old 09-11-11, 08:22 PM   #3
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The speedo and tach needles have capacitors on the back of the cluster that help to power them. Pull your cluster and if the needles are good have all of the capacitors on each needle replaced at a local electronics repair shop. You could also DIY it if you are handy with a soldering iron.
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Old 09-12-11, 01:39 AM   #4
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well the rest of the capacitors look fine but im going to take it to work and look at it under the scope





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Old 09-12-11, 02:30 AM   #5
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Quote:
Originally Posted by Arkansas View Post
Try slapping the dash above the cluster. My 92 sc400 does the same thing and slapping the dash does the trick.
i do that daily
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Old 09-12-11, 12:31 PM   #6
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slapping the dash didn't work for me btw, before I take out the capacitors I'm gonna try a new ignitor to see if that works.
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Old 09-12-11, 03:08 PM   #7
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Quote:
Originally Posted by Arkansas View Post
Try slapping the dash above the cluster. My 92 sc400 does the same thing and slapping the dash does the trick.
nothing a quick slap couldnt fix! my speedo and tach stick on occasion... slap and fixed! lol
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Old 09-14-11, 07:15 PM   #8
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so it wasn't the capacitors, they were replaced anyways though with more efficient ones. Module should be in by Friday, ill keep updated
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Old 09-16-11, 12:19 AM   #9
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Slappa da dash!
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Old 09-16-11, 09:44 PM   #10
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bump need some help, all the caps are good circuit is good.
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Old 09-17-11, 04:16 AM   #11
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x2

I have the same problem and I even switched the cluster to a better condition one. It worked for like 1 week or so and ended up with the same problem.
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Old 09-17-11, 09:38 AM   #12
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Quote:
Originally Posted by FatBrian81 View Post
The speedo and tach needles have capacitors on the back of the cluster that help to power them.
I don't know why people still quote the lighting fix for a digital australian soarer backlight (or occasionally some LS cathode needles), it's been 8 years since anyone posted it. (PS no they don't).

Quote:
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Pull your cluster and if the needles are good have all of the capacitors on each needle replaced at a local electronics repair shop.
No such thing.

Speedo is controlled by the main chip, that's why there is no fix posted.
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Old 09-17-11, 10:27 AM   #13
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Quote:
Originally Posted by O. L. T. View Post
I don't know why people still quote the lighting fix for a digital australian soarer backlight (or occasionally some LS cathode needles), it's been 8 years since anyone posted it. (PS no they don't).

No such thing.

Speedo is controlled by the main chip, that's why there is no fix posted.
I had posted about this problem a while back and that was the fix that was given to me, I haven't got a chance to tear everything down yet to do something about it.
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Old 09-17-11, 10:28 AM   #14
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You'd be sadly dissapointed if you did.
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Old 09-18-11, 11:32 PM   #15
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speedo has been fixed, RPM still isn't working.

some how both VSS #1 and #2 are both bad. I really don't know how both went bad at the same time, but I'm glad I got the speedo fixed. Now to figure out why the RPM isn't working.
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