I was messing around the other day on a dirt road and decided to put the 4runner in 4WD. I did and the light did not turn on. I sat at idle for about 30 seconds, went forward and backward and nothing. I then shifted into 4lo and it went in but still no light. Honestly it's been 3-4 months since I last took it out of 2wd but I can't think of anything that could have messed it up. I also am not sure it's just a bulb as the light worked last time and it doesn't get much use.
Is there anything else I could check before I break open the dash? I don't think there is any harm in driving it with a bad bulb, right? Other than accidentially DD in 4wd. The system doesn't require the bulb to be lit, right?