All Doors Fail to Lock/Unlock From Both Cylinder Lock Switches

Tests 1 - 4:

SYMPTOM
ALL DOORS FAIL TO LOCK AND UNLOCK FROM BOTH CYLINDER LOCK SWITCHES

POSSIBLE CAUSES
- DTC present
- Cylinder lock switch MUX circuit open
- Cylinder lock switch MUX circuit short to voltage
- Central timer module - cylinder lock switch MUX circuit open