All Doors Fail to Lock From Any Switch

Test 1 - 4:

Test 5 - 6:

SYMPTOM
ALL DOORS FAIL TO LOCK FROM ANY SWITCH

POSSIBLE CAUSES
- Door Lock Relay Output Circuit Short To Ground
- Key-in Ignition Switch Shorted
- Key-in Ignition Switch Sense Circuit Short To Ground
- Central Timer Module - Door Lock Open
- Central Timer Module - Key-in Ignition Switch Shorted