Symptom:
*NO RESPONSE FROM TRANSFER CASE CONTROL MODULE
POSSIBLE CAUSES
NO RESPONSE FROM TRANSFER CASE CONTROL MODULE
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
TRANSFER CASE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
NOTE: As soon as one or more module communicates with the DRBIIIt,
answer the question.
With the DRBIIIt, attempt to communicate with the Airbag Control Module.
With the DRBIIIt, attempt to communicate with the Front Control Module.
Was the DRBIIIt able to I/D or establish communicationswith either of the modules?
All
Yes → Go To 2
No → Refer to the Communications category and perform the symptom
PCI Bus Communication Failure.
Perform TRANSFER CASE VERIFICATION TEST.
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?
All
Yes → Go To 3
No → Repair the Fused B(+) circuit for an open. If the fuse is open make
sure to check for a short to ground. Refer to the wiring diagrams
located in the Service Information.
Perform TRANSFER CASE VERIFICATION TEST.
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?
All
Yes → Go To 4
No → Repair the Ground circuit for an open. Refer to the wiring
diagrams located in the Service Information.
Perform TRANSFER CASE VERIFICATION TEST.
294
COMMUNICATION
To Next Page
Loading...
