Pinpoint Test BA: DTC U0164 Or DTC U0164:00
Information and Entertainment System
Pinpoint Tests
Pinpoint Test BA: DTC U0164 Or DTC U0164:00
- DTC U0164 (Lost Communication With HVAC Control Module ( EATC)) - set by the non-navigation Audio Control Module (ACM), the non-navigation Front Controls Interface Module (FCIM), or the Front Display Interface Module (FDIM) when network messages are missing from the HVAC module over the Medium Speed Controller Area Network (MS-CAN) for greater than 5 seconds with the ignition in the RUN position.
- DTC U0164:00 (Lost Communication With HVAC Control Module: No Sub Type Information) - set by the navigation ACM when network messages are missing from the HVAC module over the MS-CAN for greater than 5 seconds with the ignition in the RUN position.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- FCIM
- FDIM
- ACM
- APIM
PINPOINT TEST BA: DTC U0164 OR DTC U0164:00
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BA1 CHECK THE DTCs
NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during Programmable Module Installation (PMI) or the PMI may not have been carried out.
- Ignition ON.
- Clear the ACM (navigation only), FCIM (without navigation), and FDIM (without navigation) DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Repeat the ACM (navigation only), FCIM (without navigation), and FDIM (without navigation) self-tests.
- Is DTC U0164 or DTC U0164:00 still present?
Yes
GO to BA2.
No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
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BA2 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Operate the climate control system.
- Is an observable symptom present?
Yes
GO to BA3.
No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring. CHECK the MS-CAN wiring between the APIM and the module in question for an intermittent fault.
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BA3 CHECK THE COMMUNICATION NETWORK
- Carry out the network test using the scan tool.
- Does the HVAC module pass the network test?
Yes
GO to BA4.
No
REFER to The HVAC Module Does Not Respond To The Scan Tool in Module Communications Network Testing and Inspection.
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BA4 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM (with navigation)
- FCIM (without navigation)
- FDIM (without navigation)
- HVAC module
- Are any low or high voltage DTCs recorded in any module?
Yes
REFER to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
No
INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (HVAC) Module. CLEAR all continuous DTCs from all modules. REPEAT the ACM, FCIM, and FDIM self-tests.
If DTC U0164:00 is still present in the ACM, INSTALL a new ACM. REFER to Audio Control Module (ACM) Audio Control Module (ACM). TEST the system for normal operation.
If DTC U0164 is still present in the FCIM, INSTALL a new FCIM. REFER to Front Controls Interface Module (FCIM) Front Controls Interface Module (FCIM). TEST the system for normal operation.
If DTC U0164 is still present in the FDIM, INSTALL a new FDIM. REFER to Front Display Interface Module (FDIM) Front Display Interface Module (FDIM). TEST the system for normal operation.
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