cluster gauge shift indicator light not working

"Hi,

Have you checked that the lamp itself in the shift assembly is OK, you didn’t say?

Here’s an image taken from the 2006 Jeep Liberty repair manual wiring section

It shows that power for the shift assembly lamp is the same power that supplies the instrument cluster panel lamps.

If the instrument panel lights are working then you need to check if there is power coming from terminal 21 of the junction terminal block ( see p.8W12-2 & 8W12-3 in the manual, orange / brown wire) or if it is getting to terminal 1 of the shift lever assembly block.

If the power is OK at the shift lever assembly block and the lamp is OK check that there is an earth at terminal 2 of the shift lever assembly block.

(click on image to enlarge for better viewing)"