U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.

Battery voltage between 10 and 16 volts.

IOD fuse installed.

TIPM is configured correctly.
Set Condition:
Bus messages not received from the A/C Heater Control (HVAC) for approximately 2 to 5 seconds.

Possible Causes

CAN C INTERIOR BUS (125K) CIRCUITS OPEN OR SHORTED

DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES

TIPM NOT CONFIGURED CORRECTLY

A/C HEATER CONTROL POWER AND GROUND

A/C HEATER CONTROL

MODULE THAT SET THIS DTC

Diagnostic Test

1. VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Is this DTC active?

Yes

Go To 2

No

Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS

With the scan tool, read active DTCs from all modules.

NOTE: Check for TIPM configuration, CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

Diagnose and repair the DTC. Refer to the Index for a complete list of the symptoms.

No

Go To 3

3. VERIFY THAT THE HVAC IS ACTIVE ON THE BUS

Turn the ignition on.
With the scan tool, select Network View and select Advanced.
Verify that the HVAC is active on the bus.

Is the HVAC active on the bus?

Yes

Go To 4

No

Refer to the No Response test procedure. Refer to the table of contents in this section.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS

With the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs “Logged Against” the HVAC?

Yes

Replace/update the A/C Heater Control in accordance with the service information.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

No

Replace/update the module that set the DTC in accordance with the service information
Perform the appropriate VERIFICATION TEST.