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COMMUNICATION
Symptom:
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE
NO RESPONSE FROM CAB
GROUND CIRCUIT OPEN
OPEN FUSED RUN RELAY OUTPUT CIRCUIT/FUSED B(+) (VALVE) 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.
With the DRB, attempt to communicate with the Body Control Module (BCM).
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 harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for each circuit?
Yes → Go To 3
→ Repair the ground circuit(s) for an open.
No
3
Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Run Relay Output
circuit and Fused B(+) (Valve) circuit.
Is the test light illuminated?
Yes → Go To 4
→ Repair the Fused Run Relay Output circuit or Fused B(+) (Valve)
No
POSSIBLE CAUSES
ACTION
PCI Bus Communication Failure.
Perform ABS VERIFICATION TEST - VER 1.
Perform ABS VERIFICATION TEST - VER 1.
circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
338
APPLICABILITY
All
All
All
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