7000 - 7999: 7230

7230-LOST COMMUNICATION WITH CLUSTER/CCN

For a complete wiring diagram Consult Diagrams/Electrical

Theory of Operation

The Anti-Lock Brake System receives information from the Engine, Transmission Control Module, and the Electronic Gear Shift control modules over the CAN C bus. The CAN C bus is a high speed communication bus that allows real time control capability between various controllers. Most messages are sent every 20 mSec, this means critical information can be shared between multiple controllers almost instantaneously. The CAN C bus is a two wire bus with a CAN (+) and a CAN (-) circuit. To reduce the potential of radio and other electrical noise interference, the CAN Bus circuit wiring is manufactured using a twisted pair configuration within the electrical wiring harness.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The DTC will set if a valid CAN ID was not received in the required time from the Cluster/CCN.





Diagnostic Test

1. CHECK THE BCM FOR CAN C BUS COMMUNICATION DTCS
With the scan tool, check for BCM DTCs.
Does the BCM report CAN C BUS DTC LOST COMMUNICATION WITH CLUSTER/CCN?

Yes

- Refer to the No Response tests Communications - Verbose Codes category and perform the appropriate procedure(s). Perform the diagnostic procedure for U0001-CAN C BUS first if it is present.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Go To 2

2. CHECK IF THE DTC IS CURRENT
Ignition on, engine not running.
With the scan tool, erase ABM/BCM DTC's.
Using the Environmental Data recorded earlier, try to duplicate the conditions in which the DTC originally set. It may be necessary to test drive the vehicle.
With the scan tool, read ABM/BCM DTC's.
Did the DTC 7230-LOST COMMUNICATION WITH CLUSTER/CCN reset?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Go To 3

3. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Were there any problems found?

Yes

- Repair as necessary.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Test Complete.