Symptom:
*NO RESPONSE FROM THE 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 DRBIII
t,
answer the question.
With the DRBIII
t, attempt to communicate with the Airbag Control Module (ACM).
With the DRBIII
t, attempt to communicate with the Central Timer Module (CTM).
Was the DRBIII
t able to I/D or establish communications with 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, probe the Fused B(+) circuit.
Note: The light must illuminate brightly, if it does not light, or lights dimly,
the circuit must be repaired. If there is any doubt, compare the brightness
when testing the circuit, to the brightness when connected directly to the
battery positive post.
Is the test light illuminated?
All
Yes
→
Go To
3
No
→
Repair the Fused B(+) circuit for an open. 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, probe each ground circuit in the
TCCM connectors.
NOTE: The light must illuminate brightly, if it does not light, or lights dimly,
the circuit must be repaired. If there is any doubt, compare the brightness
when testing the circuit, to the brightness when connected directly to the
battery negative post.
Is the light illuminated brightly at 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.
153
COMMUNICATION