How do you read codes on a 94 Geo Tracker?

Answer 1

There is a four pin diagnostic port under your hood in front of the battery with a black cover over it. Remove black rubber cover and take a paper clip or wire and jump the pin with the black wire to the pin with the blue/yellow wire. with the port "jumped" turn key into the on position. Codes should then read, if not, then locate a small switch located behind the cover where your drivers side front speaker is, remove cover and flip the switch and light should go out as this is a maintenance reset switch put in place at the factory. May have to remove speaker to locate switch.