IC/HVAC CAN Message Missing

P0600 - IC/HVAC CAN MESSAGE MISSING





When Monitored and Set Condition

- When Monitored: IC CAN-ID received at least once and CAN BUS Circuit DTC is not active.
- Set Condition: CAN message received from the Instrument Cluster is missing or the IC reports over the CAN C BUS an SCI BUS message missing from the A/C Heater Control Module.





For a complete Transmission Control Module Circuit Diagram, [1][2]Automatic Transmission/Transaxle.

For a complete CAN BUS Circuit Diagram, Communications.

Diagnostic Test

1. PRE-DIAGNOSTIC CHECK OUT
NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low, locate and repair the leak, then check and adjust the fluid level.

NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.

With the scan tool, read Engine DTCs. Check and repair all engine DTCs prior to performing transmission symptom diagnostics.
With the scan tool, read and record all Transmission DTCs.

NOTE: Check connectors - Clean/Repair as necessary. Poor pin to terminal connections can set DTCs.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Most DTCs set on startup but some must be set by driving the vehicle such that all diagnostic monitors have run.

NOTE: Check for any Technical Service Bulletins that may apply.

Perform this procedure prior to Symptom diagnosis.

Continue

- Go To 2

2. CHECK TO SEE IF (P0720) CAN BUS CIRCUIT DTC PRESENT
Turn the ignition on.
With the scan tool, read Transmission DTCs.

NOTE: If DTC (P0720) CAN BUS CIRCUIT is present, perform diagnostics on that symptom first.

Is DTC (P0720) CAN BUS CIRCUIT present?

Yes

- Diagnose and repair the DTC(s).

No

- Go To 3

3. CHECK TO SEE IF INSTRUMENT CLUSTER DTC PRESENT
With the ignition on.
With the scan tool, read Instrument Cluster DTCs.
Are any Instrument Cluster DTCs present?

Yes

- Diagnose and repair the DTC(s).

No

- Go To 4

4. CHECK TO SEE IF A/C HEATER CONTROL MODULE DTC PRESENT
With the ignition on.
With the scan tool, read A/C Heater Control Module DTCs.
Are any A/C Heater Control Module DTCs present?

Yes

- Diagnose and repair the DTC(s).

No

- Go To 5

5. CAN C BUS (+) OR (-) CIRCUIT(S) OPEN




Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between the CAN C BUS (+) circuit and the CAN C BUS (-) circuit in the Instrument Cluster C1 harness connector.
Is the resistance 60 ohms ± 3.0 ohms?

Yes

- Go To 6

No

- Repair the faulty CAN C BUS circuit for an open.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

6. SERIAL COMMUNICATION K1 OR K2 CIRCUIT OPEN




With the ignition off.
Disconnect the A/C Heater Control Module harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Serial Communication K1 and K2 circuits from the Instrument Cluster C1 harness connector to the A/C Heater Control Module harness connector.
Is the resistance below 5 ohms for both circuits?

Yes

- Go To 7

No

- Repair the Serial Communication circuit(s) for an open.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

7. MODULE REPLACEMENT
Replace the A/C Heater Control Module. Removal.
Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test
Turn the ignition on.
With the scan tool, read Transmission DTCs.
Did this DTC set again?

Yes

- Replace the Instrument Cluster. Instrument Cluster - Removal.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

No

- Test Complete.