Symptom:
*NO RESPONSE FROM HVAC
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH ANOTHER MODULE
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
OPEN GROUND CIRCUIT
OPEN PCI BUS CIRCUIT
A/C HEATER CONTROL
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the Airbag Control Module.
With the DRB, attempt to communicate with the Instrument Cluster.
Was the DRB able to I/D or communicate with both modules?
All
Yes → Go To 2
No → Refer to symptom list for problems related to the PCI Bus
Communication Failure.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the A/C Heater Control C2 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?
All
Yes → Go To 3
No → Repair the Fused Ignition Switch Output circuit for an open or
short. Refer to the wiring diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Using a 12-volt test light connected to 12-volts, probe the Ground circuit.
Is the test light illuminated?
All
Yes → Go To 4
No → Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
160
COMMUNICATION
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