hi friends!!!
a few days ago i was driving my beloved 4runner and i get stucked in a trail so i decide to use the 4wd , yuuuuhuuuu time to make some mud diggin,but for a reason my 4wd indicator doesnt light up!!!! so i move to 4h then 4lo and move it a little forward and then 2h and it seems the 4wd was working.anyway i managed to get out of the trail with no problems and keep driving on road to my house wile parked in my garage i tried again the 4wd system and the light turn on for a few seconds,!!!!! uuhhhhhmm something is wrong i said!!! so i take the service manual and start to check avery external component of the 4wd everything was ok and the light was not working so i take off the gauges and check all the instrument panel lights,only one blown the seatbelt reminder.routing the indicator light i see a little plug near the exhaust manifold the left one and it ends in the 4wd indicator switch so i remove the entire cable and it was dirty at both ends filled with dirt and grease ,i clenaed the plug s but whena i was going to reattach the plug in the engine bay i discovered that the male plug doesnt activate the locking pin,it was broken!!!!!! thats the reason why my 4wd indicator light was intermitent!!!!! sooooo i make a new plug with few spare ones and now is working like new again.
possible cause
brittle plastic plug
broken by previous owner
location it was near the exhaust manifold

so friends check yours!!!

 

interesting, my prev 22r 4x4 had a failed indicator, but my new(er) 3.0 is working fine...

nice to know how to fix stuff.
what engine do you have ??