Power to unit is through ignition circuit via
Gauges and Cig/Radio fuses.
The connection to the ECM-B fuse is for back up power to remember trouble codes so probably not problem.
A/C power transistor is for controlling and monitoring blower motor, but has nothing to do with simple display.
Don't know if you could have melted/shorted it somewhere in the connector without blowing a fuse first.
Happy hunting, grab some extras of those pesky display light bulbs from any broken A/C control units you find(the ones that Lexus wanted $10 a piece for when I first bought the rig (and the yard let's me have em for free)
Wednesday, April 4th, 2012 AT 4:05 AM