The 2006 Honda Ridgeline radio lights are not working. It looks like its part of the factory radio,I lifted of the dash panel to inspect, but the radio area is sealed so bulb relacement seem dificult.

Owner's Manual ' 2006 Honda Ridgeline

https://owners.honda.com > 2006 > Ridgeline > manuals
View and print online owner's manuals for your 2006 Honda Ridgeline, ... If your vehicle is equipped with a navigation system, a navigation manual with ...

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  2006 Ridgeline Online Reference Owner's Manual - Honda ...

  http://techinfo.honda.com > rjanisis > pubs > enu
  PDF
  Your selection of a 2006 Honda Ridgeline was a wise investment. ... Only on vehicles equipped with navigation system. Refer to the navigation system manual.

2006 Honda Ridgeline - Navigation Manual (3 pages)

https://carmanuals2.com > honda > ridgeline-2006-navi...
Sept 24, 2014 - 2006 Honda Ridgeline - Navigation Manual (3 pages) ... Other 2006 Honda Ridgeline Manuals: ... Use these links (and links throughout this manual) to ...

1. Pull the plastic panels off under the seat. pull them straight forward to remove them.
2. Remove the six bolts (14mm) holding the seat and center seatbelt in place.
3. Pop the two small plastic covers at the top and behind the seat using a trim removal tool or screwdriver. Cover the screwdriver with something so you don't damage anything.
4. Lift the seat straight upward and take it out

Hold preset buttons #1 & #6 down, turn on radio. Keep holding down buttons, record 1st 4, then 2nd 4, of radio serial number. Either register your car on-line with Honda to get the code or go to a Honda dealer.

there are many lights, name one.
there are back lamps. and the park/dimmer lamp. and the LCD lamp
and or ? other ;lamps
name just one.
radios have 3 power sources (and 4th is ground)(
1: power. (makes the whole radio and all audio work)
2: park/dim (back ground lamps) turn up the dimmer knob.
3: memory. (stores station you like)

if all other inside park./dim lamps work (can be over 20)
and the radio lamps are dead, then they are burned out.
that requires, removal and repairs.

From Owner's Link:

Maintenance Minder B Scheduled Maintenance
Recommended service for your 2006 Honda Ridgeline:

Replace engine oil and oil filter
Rotate tires
Inspect front and rear brakes
Check parking brake adjustment
Inspect tie rod ends, steering gear box, and boots
Inspect suspension components
Inspect driveshaft boots
Inspect brake hoses and lines (including ABS)
Inspect all fluid levels and condition of fluids
Inspect exhaust system#
Inspect fuel lines and connections#

Adjust the valves during services A, B, 1, 2, or 3 if they are noisy.

Maintenance Minder 6 Scheduled Maintenance
Recommended service for your 2006 Honda Ridgeline:

Replace VTM-4 rear differential fluid: Driving in mountainous areas at very low vehicle speeds or trailer towing results in higher level of mechanical (shear) stress to fluid or frequently fully loaded. This requires differential fluid changes more frequently than recommended by the Maintenance Minder. If you regularly drive your vehicle under these conditions, have the differential fluid changed at 7,500 miles (12,000 km), then every 15,000 miles (24,000 km).

under the hood check fuse #4-small lights, it may be going or gone. worked for me!!!!

it might be a check engien light warning

Hi,
I bought a 2007 Honda Ridgeline. The radio is locked. Kindly help me with the code. These numbers are on the radio which is a 6 CD loader which i think is pioneer.

the tire pressure is low, and after driving a few miles it warms up, the air expands and the light goes off, when tires are cool, check and set all of your tire pressures to what is listed on the door decal. if the tire are hot take the decal and add 4psi

If the code is not written on the radio casing or inside the glove compartment (or similar place inside your car ) then the majority of HONDA codes are only available from here 

https://radio-navicode.honda.com 

You will require the car VIN number and Radio serial Number 

If they cannot provide your code then you will have to try your HONDA Main Dealer .....or a Decode Service who will plug in a laptop to read/recode the memory chip (EEPROM)