If its a diesel, it has em. No light, just listen to the clicks. Turn key just before starter... you'll hear a loud "click". Wait for it... you'll hear another click, after 2-5 seconds. Now start it. If its cold, you may hear a series of "click-clicks" as the afterglow system continues to heat the plugs, for up to 30 seconds or so.

Winter time, this is obviously very power hungry, so make sure you have a good battery (or batteries) with lots of cold cranking amps.

HTH
Phil

1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/