That could be the cause, or it could be :
2. Function Selector
3. 4WD mode switch ( if 4x4 )
4. Ashtray illumination
5. steering column illumination
6. Circuit to / or instrument cluster illumination
7. Any of the power window / power door lock switches or the wiring for this to the doors
8. overhead console
9. adjustable pedal switch or rear sliding window switches ( if equiped ).
You can leave the dimmer switch connector C 245 unplugged ( 6 pin connector, all in 1 row ) and jumper the power in to the power out, and see if you blow a fuse.
Think the connector is 1/8" spade terminals. Should be able to make a jumper, and place it in the connector that is unplugged, by passing the dimmer switch all together.
The connector orientation should be with the tab to the right, pin #1 is on the top, Pin #6 is on the bottom.
Jumper pin #1 to pin #6 ( this should be Dark Blue w/ White stripe wire to light blue w/ red stripe wire ).
The panel illumination should be at full brightness ( just before the detent for the interior lamps ). I have not tried this myself, but the test for that section of the panel illumination is to test the switch with an ohm meter from pin #1 to pin #6, and as the dial is rotated from high to low ( brightness ) the resistance should go from low to high.
If the Resistance is removed, there is not a voltage drop in the circuit, lamps should be full bright.
This should be an easy test, next step is removing illumination via connectors ( need to remove the pin from the connector with the molex tool ) to see which branch is causing the problem if the fuse still blows.