Bus (+/-) Signals Open From or Blank Screen on OTIS

Test 1 - 3:

Test 4 - 5:

SYMPTOM
BUS +/- SIGNALS OPEN FROM OR BLANK SCREEN ON OTIS

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- PCI bus circuit open (OTIS)
- Ground circuit open
- Attempt to communicate with another module
- Check the PCI bus circuit for voltage