Pinpoint Tests CD: DTC U0155

Seats

Pinpoint Test CD: DTC U0155

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 123, Memory Seats for schematic and connector information. Diagrams By Number

Normal Operation

The Driver Seat Module (DSM) and the Instrument Cluster (IC) communicate using the Medium Speed Controller Area Network (MS-CAN). Messages are exchanged between the modules on the MS-CAN for the purposes of determining what functions are being carried out.

- DTC U0155 (Lost Communication with Instrument Panel Cluster (IC) Control Module) - set by the Driver Seat Module (DSM) if ignition status message is present, and if messages are missing for 15 seconds or longer from the Instrument Panel Cluster (IPC) over the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following:

- Module communication
- DSM
- IPC

PINPOINT TEST CD: DTC U0155

-------------------------------------------------
CD1 VERIFY CUSTOMER CONCERN

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

Yes
GO to CD2.

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

-------------------------------------------------
CD2 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 CD3.

No
REFER to Module Communications Network Testing and Inspection.

-------------------------------------------------
CD3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST

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

Yes
For DTC B1317, GO to Pinpoint Test CE. Pinpoint Tests CE: DTC B1317

For DTC B1318, GO to Pinpoint Test CA. Pinpoint Tests CA: DTC B1318

No
GO to I4. Pinpoint Test I: A Single Climate Controlled Seat Is Inoperative - Front

-------------------------------------------------
CD4 RECHECK THE DSM 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 DSM self-test.
- Is DTC U0155 still present?

Yes
GO to CD5.

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

-------------------------------------------------
CD5 CHECK FOR DTC U0155/U0155:00 IN OTHER MODULES

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during PMI or the PMI may not have been carried out.

- 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/U0155:00 set in other modules?

Yes
INSTALL a new IPC. REFER to Instrumentation, Message Center, and Warning Chimes Instrument Panel Cluster (IPC). TEST the system for normal operation.

No
INSTALL a new DSM. REFER to Driver Seat Module (DSM) Driver Seat Module (DSM). TEST the system for normal operation.

-------------------------------------------------