Pinpoint Tests BR: DTC U0164:00

Instrumentation, Message Center and Warning Chimes

Pinpoint Test BR: DTC U0164:00

Normal Operation
- DTC U0164:00 (Lost Communication With HVAC Control Module: No Sub-Type Information) - sets in the Instrument Panel Cluster (IPC) if data messages received from the HVAC module over the Medium Speed Controller Area Network (MS-CAN) are missing. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.

This pinpoint test is intended to diagnose the following:

- HVAC module
- IPC


PINPOINT TEST BR: DTC U0164:00

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BR1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to BR2.

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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BR2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.
- 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 BR3.

No
REFER to Module Communications Network Testing and Inspection.

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BR3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
GO to Pinpoint Test BX (U3003:16) or GO to Pinpoint Test BY (U3003:17). Pinpoint Tests BX: DTC U3003:16 Pinpoint Tests BY: DTC U3003:17

No
GO to BR4.

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BR4 RECHECK THE IPC DTCs

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI may not have been carried out.

- Clear the DTCs. Repeat the IPC self-test.
- Is DTC U0164:00 still present?

Yes
INSTALL a new HVAC module. CLEAR the DTCs. REPEAT the IPC self-test.

If DTC U0164:00 is still present, INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). 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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