DTC U0164: Lost Communication With HVAC Control Module: Notes

Fig 1: Communication Circuit Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

For a complete wiring diagram Refer to SYSTEM WIRING DIAGRAMS .

• When Monitored: 
  • With the ignition on 
  • Battery voltage between 10 and 16 volts 
  • IOD fuse installed 
  • FCM 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 B BUS CIRCUITS OPEN OR SHORTED

DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES

FCM NOT CONFIGURED CORRECTLY

A/C HEATER CONTROL POWER AND GROUND

A/C HEATER CONTROL

MODULE THAT SET THIS DTC