Lloyd1136

I have a 1998 lexus ls400 and after 15 minutes driving and all the dash needles drop to 0 and don't come back. I feel it's a temperature thing because if I go shopping for 2 hours the dash works again for 15mins the they drop again.
has anybody got any fix for this or what is going wrong

paulo57509

When you say all the gauges, even the temp and fuel gauges?

Yamae

Sounds like the power supply circuit for gauges is dying.

Unfortunately it's beyond average DIYers to fix. It needs certain skills of electronics to fix it. The photo below is for a JDM 98 Celsior's power supply circuit for the cluster and as you see one of capacitors sleeve is shrunk due to the heat. As I fix clusters, I sometimes find failed parts around here. Some just a capacitor was dying, some regulator IC, ceramic resonator, and some metal coating resistor. Sometimes the regulator IC is oscillating. There are some companies in US to fix your type of problems. I'd fix it for free if you were living within a few miles.

Lloyd1136

yes everything goes to 0 almost like the power gone out and when it has a rest and you start again it all works but only 5 to 10min

paulo57509

If it was just the speedo or tach, I was thinking it was dried out instrument lube. If all of the gauges die, see Yamae's Post #3.