No Response From Controller Antilock Brake

Test 1-3:

Test 4-8:

Test 9-12:

Symptom:
NO RESPONSE FROM CAB CONTROLLER

POSSIBLE CAUSES
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
GROUND CIRCUIT OPEN
CCD BUS W CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT INTERMITTENTLY SHORTED TO GROUND
FUSED IGNITION SWITCH OUTPUT CIRCUIT SHORTED TO GROUND
CAB DEFECTIVE - FUSED IGNITION SWITCH OUTPUT SHORTED TO GROUND
CAB DEFECTIVE - NO RESPONSE