Pinpoint Tests BJ: DTC U0424:82

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test BJ: DTC U0424:82

Normal Operation

- DTC U0424:82 (Invalid Data Received from HVAC Control Module: Alive/Sequence Counter Incorrect/Not Updated) - sets in continuous memory in the Instrument Panel Cluster (IPC) if data messages received from the HVAC module through the BCM over the High Speed Controller Area Network (HS-CAN) are not updated for 5 seconds or longer. 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 BJ: DTC U0424:82

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BJ1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to BJ2.

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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BJ2 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 BJ3.

No
REFER to Module Communications Network Testing and Inspection.

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BJ3 RETRIEVE THE RECORDED DTCs FROM THE HVAC MODULE SELF-TEST

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

Yes
Climate Control System - General Information and Diagnostics Testing and Inspection.

No
GO to BJ4.

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BJ4 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
For DTC U3003:16, GO to Pinpoint Test BK. For DTC U3003:17, GO to Pinpoint Test BL. Pinpoint Tests BK: DTC U3003:16 Pinpoint Tests BL: DTC U3003:17

No
GO to BJ5.

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BJ5 RECHECK THE IPC DTCs

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the IPC self-test.
- Is DTC U0424:82 still present?

Yes
INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (HVAC) Module. CLEAR the DTCs. REPEAT the IPC self-test. If DTC U0424:82 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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