All Doors Fail to Lock/Unlock From Any Switch

Test 1 - 3:

Test 4 - 9:

SYMPTOM
ALL DOORS FAIL TO LOCK/UNLOCK FROM ANY SWITCH

POSSIBLE CAUSES
- CTM - B+ short to ground
- Fused B(+) circuit open
- Door lock driver circuit open
- Door unlock driver circuit open
- CTM main ground circuit open
- CTM logic ground circuit open
- Fused B(+) CKT short to ground
- Central timer module (CTM)