No Response From Transfer Case Control Module - Dodge Ram 2004 Service Manual

COMMUNICATION
Symptom:

*NO RESPONSE FROM TRANSFER CASE CONTROL MODULE

NO RESPONSE FROM TRANSFER CASE CONTROL MODULE
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
TRANSFER CASE CONTROL MODULE
TEST
1 Turn the ignition on.
NOTE: As soon as one or more module communicates with the DRBIII ,
answer the question.
With the DRBIII , attempt to communicate with the Airbag Control Module.
With the DRBIII , attempt to communicate with the Front Control Module.
Was the DRBIII 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 to the lock position.
Disconnect the TCCM harness connectors.
Using a 12-volt test light connected to ground, check the Fused B(+) circuit in the
TCCM harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes → Go To 3
→ Repair the Fused B(+) circuit for an open. If the fuse is open make
No
3 Turn the ignition off to the lock position.
Disconnect the TCCM harness connectors.
Using a 12-volt test light connected to 12-volts, check each ground circuit in the
TCCM harness connectors.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly for each Ground circuit?
Yes → Go To 4
→ Repair the Ground circuit for an open. Refer to the wiring
No
POSSIBLE CAUSES
ACTION
PCI Bus Communication Failure.
Perform TRANSFER CASE VERIFICATION TEST.
sure to check for a short to ground. Refer to the wiring diagrams
located in the Service Information.
Perform TRANSFER CASE VERIFICATION TEST.
diagrams located in the Service Information.
Perform TRANSFER CASE VERIFICATION TEST.
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APPLICABILITY
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