Pinpoint Test Ah: DTC U0164 Or DTC U0164:00

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

AH1 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs from all modules.
- Is DTC U0164 or DTC U0164:00 set in any audio system module?
- Yes : GO to AH2.
- No : The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
AH2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
  - ACM
  - FCIM
  - FDIM
  - HVAC module
- Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?
- Yes : For an audio system module, REFER to DTC CHARTS in this service information.
  For the HVAC module, REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION & DIAGNOSTICS -- FUSION, MILAN & MKZ (EXCEPT HYBRID) article or CLIMATE CONTROL SYSTEM - GENERAL INFORMATION & DIAGNOSTICS -- FUSION, MILAN & MKZ (HYBRID) article.
- No : GO to AH3.
AH3 CHECK FOR DTC U0164 OR DTC U0164:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
- Is DTC U0164 or DTC U0164:00 set in more than one audio system module?
- Yes : GO to AH4.
- No : If there is an observable symptom, GO to SYMPTOM CHART - GENERAL AUDIO SYSTEM to diagnose the observed symptom.
  If there is no observable symptom, CHECK the MS-CAN wiring between the HVAC module and the module in question for an intermittent fault.
AH4 CHECK FOR CORRECT HVAC MODULE OPERATION
- Disconnect all the HVAC module connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the HVAC module connectors and make sure they seat correctly.
- Is the concern still present?
- Yes : INSTALL a new HVAC module. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ article. CLEAR all continuous DTCs. TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the self-test for the module(s) that set DTC U0164 or DTC U0164:00.