U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Continuously when the ignition is on.

Battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fused installed.

Totally Integrated Power Module (TIPM) is configured correctly.
Set Condition:
Bus messages not received from the HVAC Control Module for approximately two to five seconds.

Possible Causes
CAN BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
HVAC CONTROL MODULE POWER AND GROUND
TIPM NOT CONFIGURED CORRECTLY
HVAC CONTROL MODULE
MODULE THAT SET THIS DTC

VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE

NOTE: Make sure the IOD fuse is installed and the battery is fully charged before proceeding.

1.	Turn the ignition on.

2.	With the scan tool, read active DTCs.

Is this DTC active?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing) and perform the U0164-Lost Communication with HVAC Control Module diagnostic procedure.

(Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the Stored Lost Communication DTCs diagnostic procedure.