Transmission Range (TR) Switch
WARNING: This page is about a different car, the 1995 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
TR switch (shift switch) delivers an input signal to TCM indicating shift lever position. Switch is located on side of transaxle, and prevents engine starting when transaxle is in any gear other than Park or Neutral. The back-up light circuit is completed when TR switch is in Reverse.