Pinpoint Tests BA: DTC U0164
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test BA: DTC U0164
Normal Operation
- DTC U0164 (Lost Communication With HVAC Module) - sets in the Instrument Cluster (IC) if the data messages received from the HVAC module over the Medium Speed Controller Area Network (MS-CAN) are missing for 5 seconds or longer.
This pinpoint test is intended to diagnose the following:
- HVAC module
- IC
PINPOINT TEST BA: DTC U0164
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BA1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?
Yes
GO to BA2.
No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
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BA2 CHECK THE COMMUNICATION NETWORK
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the HVAC module pass the network test?
Yes
GO to BA3.
No
REFER to Information Bus.
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BA3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST
- Check for recorded IC DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?
Yes
For DTC B1317, GO to Pinpoint Test AQ. Pinpoint Tests AQ: DTC B1317
For DTC B1318, GO to Pinpoint Test AR. Pinpoint Tests AR: DTC B1318
No
GO to BA4.
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BA4 RECHECK THE IC 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.
- Clear the DTCs. Repeat the IC self-test.
- Is DTC U0164 still present?
Yes
INSTALL a new HVAC module. TEST the system for normal operation. REPEAT the IC self-test.
If DTC U0164 is still present, INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
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