Pinpoint Test D: DTC U0155

Smart Junction Box (SJB)

Pinpoint Tests

Pinpoint Test D: DTC U0155

Normal Operation
- DTC U0155 (Lost Communication with Instrument Panel Cluster (IC) Control Module) - set by the Smart Junction Box (SJB) if IGN status message is present, and if messages are missing for 15 seconds or longer from the Instrument Cluster (IC) over the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following:

- Module communication
- SJB



PINPOINT TEST D: DTC U0155

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D1 VERIFY CUSTOMER CONCERN


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

Yes
GO to D2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or intermittent fault condition.

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D2 CHECK THE COMMUNICATION NETWORK


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the SJB pass the network test?

Yes
GO to D3.

No
REFER to Information Bus.

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D3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST


- Check for recorded SJB DTCs from the self-test.
- Is DTC B1317 or B1318 recorded?

Yes
For DTC B1317, Go To Pinpoint Test b. Pinpoint Test B: DTC B1317

For DTC B1318, Go To Pinpoint Test c. Pinpoint Test C: DTC B1318

No
GO to D4.

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D4 RECHECK THE SJB 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 SJB self-test.
- Is DTC U0155 still present?

Yes
INSTALL a new SJB. REFER to Smart Junction Box (SJB) Service and Repair. TEST the system for normal operation. REPEAT the SJB self-test.

If DTC U0155 is still present, INSTALL a new IC.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or intermittent fault condition.

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