Door ajar light is supplied 12v constantly, It grounds through with door ajar switch which are the switches in the rear of the jamb, similar to the normal pin switches used for dome light but because it's in the rear jamb it's much more sensitive.... If the light is on all the time try unplugging both switches.. Then plug them in one at a time, with the door fully closed the light should go out immediately...
Seat belt is fed from the time delay It doesn't know whether you've buckled up or not just turns the light on for a short time to remind you.... If the light stays on either the timer has failed on or the yellow trigger wire is receiving a ground either through the dome light switch, the headlight switch or a bare wire....