No Response From Controller Antilock Brake

Test 1 - 3:

Test 4 - 8:

Test 9 - 12:

SYMPTOM
NO RESPONSE FROM CAB

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- Ground circuit open
- CCD bus (+) 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