Bus (-) Open

Test 1 - 3:

Test 4 - 8:

Test 9 - 11:

SYMPTOM
BUS (-) OPEN

TEST NOTE
This symptom is diagnosed using the test BUS (+) & (-) OPEN.

POSSIBLE CAUSES
- Defective DRB/bias out of range
- CCD fused B(+) circuit voltage > 10
- CCD bus (+) circuit open
- CCD bus (-) circuit open
- CCD fused ignition output circuit voltage > 10
- CCD ignition OFF
- Open ground CKT/ no bus bias
- CCD BCM bias out of range
- Defective BCM- no bus bias
- Defective BCM-bus(+)(-) open