No Response From Antilock Brake Module

Test 1 - 3:

Test 4 - 5:

SYMPTOM:
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE

POSSIBLE CAUSES:
- NO RESPONSE FROM CAB
- GROUND CIRCUIT OPEN
- OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
- OPEN PCI BUS CIRCUIT
- CONTROLLER ANTILOCK BRAKE