No 4-3 Downshift Using OD Off Button

Test 1 Through 4:

Test 5 Through 7:

Symptom:
* NO 4-3 DOWNSHIFT USING OD OFF BUTTON

POSSIBLE CAUSES
GROUND CIRCUIT OPEN
O/D OFF SWITCH STUCK OPEN
OVERDRIVE OFF SWITCH SENSE CIRCUIT OPEN
OVERDRIVE OFF SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
TCM (OD CIRCUIT)