Light Switch Turned On, the Cruise Control Combination Switch Illumination Does Not Come ON

Light switch turned on, the cruise control combination switch illumination does not come on

Check the No. 6 (7.5 A) fuse in the passenger's under-dash fuse/relay box.

Do the cruise control combination switch test Cruise Control Combination Switch Test/Replacement.

Also check for

Open circuit, loose or disconnected terminals:
GRY and RED wires