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Instrument cluster gauge illumination issue 900

posted by  Keswick7 on  Fri Nov 10 22:41 CST 2023
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Wondering if anyone here might have further insight regarding what was described on a electrical diagram for the cluster as simply " solid state '. It is a square module under a metal cover on the left side, mounted with four small phillips screws and it apparently is part of the circuit that supplies voltage to the main bulbs for the speedo, tach, climate control, shift console etc.

I do get voltage at one screw where the trace leads to the bulbs but notice there is also voltage present on both sides of where the bulb holder makes contact. I gather one side should be ground.The bulbs all function but nothing at this point when secured to the circuit board.


There is a small IC on the board for the module, the cluster is a Yakuzi and I understand the earlier VDO clusters had something similar but with a fusible link.


Also have intermittent issues with the speedometer but have a feeling it is related to either the connector or wires at the speed sensor. Vehicle is a 1994 945T






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