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 SJB whenever it receives a vehicle speed message from the Instrument Panel Cluster (IPC) and then no signal is received within 5 minutes.

This pinpoint test is intended to diagnose the following:


- Module communication
- SJB
- IPC



PINPOINT TEST D: DTC U0155

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D1 VERIFY CUSTOMER CONCERN


- Ignition ON.
- Verify 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 an 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 IPC 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
GO to D5.

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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D5 CHECK FOR DTC U0155 SET IN OTHER MODULES


- Clear all DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0155 set in the ACM, DSM, audio DSP module or PAM?

Yes
INSTALL a new IPC.

No
INSTALL a new SJB. REFER to Smart Junction Box (SJB) Service and Repair.

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