Chrysler 2005 Crossfire SRT6 Service Manual page 4187

24 - 58 HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
NO COMMUNICATION TO INSTRUMENT CLUSTER (CONTINUED)
When Monitored and Set Condition
• When Monitored: With the ignition on.
• Set Condition: Serial Communication K2 failure between the A/C Heater Control Module and the Instrument
Cluster.
SERIAL COMMUNICATION K2 CIRCUIT OPEN
INSTRUMENT CLUSTER
A/C HEATER CONTROL MODULE
For a complete HVAC Circuit Diagram, (Refer to 24 - HEATING & AIR CONDITIONING - SCHEMATICS AND DIA-
GRAMS).
Diagnostic Test
1.
MEASURE THE RESISTANCE OF THE SERIAL COMMUNICATION K2 CIRCUIT
Turn the ignition off.
Disconnect the Instrument Cluster harness connector.
Note: Check connector - Clean/repair as necessary.
Disconnect the A/C Heater Control Module harness connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Serial Communication K2 circuit from
the Instrument Cluster harness connector to the A/C Heater Control
Module harness connector.
Is the resistance below 5.0 ohms?
Yes >> Replace the A/C Heater Control Module. (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS/HEATER
CONTROL - REMOVAL).
Perform BODY VERIFICATION TEST.
No >> Repair the Serial Communication K2 circuit for an open.
Perform BODY VERIFICATION TEST.
POSSIBLE CAUSES
ZH