No Response From Controller Antilock Brake - Dodge Ram 2004 Service Manual

COMMUNICATION
Symptom:

*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE

NO RESPONSE FROM CAB
GROUND CIRCUIT OPEN
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
OPEN PCI BUS CIRCUIT
CONTROLLER ANTILOCK BRAKE
TEST
1 Turn the ignition on.
Note: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, attempt to communicate with the Airbag Control Module (ACM).
With the DRB, attempt to communicate with the Instrument Cluster.
Was the DRB able to I/D or establish communications with either of the modules?
Yes → Go To 2
→ Refer to the Communications category and perform the symptom
No
2 Turn the ignition off.
Disconnect the CAB C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for both circuits?
Yes → Go To 3
→ Repair the ground circuit(s) for an open.
No
3 Turn the ignition off.
Disconnect the CAB C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?
Yes → Go To 4
→ Check IPM fuse #35 for an open. If OK, repair the Fused Ignition
No
POSSIBLE CAUSES
ACTION
PCI Bus Communication Failure.
Perform ABS VERIFICATION TEST - VER 1.
Perform ABS VERIFICATION TEST - VER 1.
Switch Output circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
268
APPLICABILITY
All
All
All