Pinpoint Test BF: DTC U2472

Instrumentation, Message Center and Warning Chimes

Pinpoint Test BF: DTC U2472

Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information Electrical Diagrams.

Normal Operation

The Instrument Cluster (IC) receives both the RUN/START and keep alive voltage inputs from the Smart Junction Box (SJB). The IC (Instrument Cluster) is grounded through a single hardwired ground.

- DTC U2472 (Unexpected Ignition State)- sets when the IC (Instrument Cluster) detects a discrepancy between the hardwired voltage input and the messaged ignition state inputs from the SJB (Smart Junction Box).

This pinpoint test is intended to diagnose the following:

- Fuse(s)

- Wiring, terminals or connectors

- SJB (Smart Junction Box)

PINPOINT TEST BF : DTC U2472

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

BF1 CHECK THE IC (Instrument Cluster) RUN/START VOLTAGE SUPPLY

- Ignition OFF.

- Disconnect: IC (Instrument Cluster) C220.

- Measure the voltage between the IC (Instrument Cluster) C220-14, circuit CBP29 (WH/VT), harness side and ground.





- Ignition ON.

- Measure the voltage between the IC (Instrument Cluster) C220-14, circuit CBP29 (WH/VT), harness side and ground.





- Place the ignition in the START position.

- Measure the voltage between the IC (Instrument Cluster) C220-14, circuit CBP29 (WH/VT), harness side and ground.





Is the voltage 0 volts in the OFF position and greater than 10 volts in the RUN and START positions?

Yes
GO to BF2.

No
VERIFY the SJB (Smart Junction Box) fuse 29 (5A) is OK. If OK, REPAIR the circuit for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short Electrical Diagrams.

BF2 CHECK THE IC (Instrument Cluster) DTCs

- Repeat the IC (Instrument Cluster) self-test.

- Clear the DTCs.

Is DTC U2472 still present?

Yes
GO to BF3.

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

BF3 CHECK the SJB (Smart Junction Box) INPUT PIDs FROM THE IGNITION SWITCH

- Enter the following diagnostic mode on the scan tool: SJB (Smart Junction Box) DataLogger.

- Select and monitor the SJB (Smart Junction Box) PIDs ignition switch ACC (IGN_A_ECU), OFF (IGN_O_ECU), RUN (IGN_R_ECU) and START (IGN_S_ECU) PIDs while cycling the ignition switch from ACC, OFF, RUN and START.

Do the SJB (Smart Junction Box) PIDs match the ignition switch positions?

Yes
GO to BF4.

No
REFER to Steering Column to diagnose the ignition switch outputs to the SJB (Smart Junction Box).

BF4 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) connectors and make sure they seat correctly.

- Operate the system and verify that the concern is still present.

Is the concern still present?

Yes
INSTALL a new SJB (Smart Junction Box). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.