For your water leak, see your other post.
For the backlighting of the steering wheel controls, do this:
1. Disconnect the battery.
2. Remove the Hushpanel cover above the driver'* feet (below the column). Plastic panel with insulation on the back side.
3. Remove the airbag fuse.
4. Disconnect the yellow wire harness above the hushpanel, below the column.
5. Using a torx driver, remove the 4 screws on the BACK side of the airbag/steering wheel center portion.
6. Remove the airbag assembly, disconnecting harnesses as you go. Gently. Now remove the steering control modules, and check the circuits/lamps.