Backup Lamps Come On While Shifter Is Not In Reverse

Test 1 Through 4:

Test 5:

SYMPTOM:
*BACKUP LAMPS COME ON WHILE SHIFTER IS NOT IN REVERSE POSITION

POSSIBLE CAUSES
BACK-UP LAMP SUPPLY CIRCUIT SHORT TO VOLTAGE
DEFECTIVE TRANSMISSION RANGE SENSOR
TRANSMISSION RANGE SENSOR (BACKUP LIGHTS ALWAYS ON)