Pinpoint Tests BD: DTC U2472
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test BD: DTC U2472
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number
Normal Operation
- DTC U2472 (Unexpected Ignition State) - a continuous memory DTC that sets in the Instrument Cluster (IC) when it detects a discrepancy between the hardwired voltage input and the messaged ignition state inputs from the Smart Junction Box (SJB) for greater than 5 seconds when the ignition switch is in the RUN position.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- SJB
- IC
PINPOINT TEST BD: DTC U2472
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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BD1 CHECK CIRCUIT CBP29 (WH/VT) FOR VOLTAGE WITH THE IGNITION SWITCH IN THE OFF POSITION
- Ignition OFF.
- Disconnect: IC C220.
- Measure the voltage between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground with the ignition switch in the OFF position.
- Is any voltage present?
Yes
GO to BD2.
No
GO to BD3.
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BD2 CHECK CIRCUIT CBP29 (WH/VT) FOR A SHORT TO VOLTAGE
- Disconnect: Ignition Switch C250.
- Measure the voltage between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
No
REFER to Steering Column to diagnose the ignition switch. Testing and Inspection
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BD3 CHECK CIRCUIT CBP29 (WH/VT) FOR VOLTAGE WITH THE IGNITION SWITCH IN THE ACC POSITION
- Ignition In ACC.
- Measure the voltage between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground with the ignition switch in the ACC position.
- Is any voltage present?
Yes
REFER to Steering Column to diagnose the ignition switch. Testing and Inspection
No
GO to BD4.
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BD4 CHECK THE IC VOLTAGE INPUT WITH THE IGNITION SWITCH IN THE ON POSITION
- Ignition ON.
- Measure the voltage between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground with the ignition switch in the ON position.
- Is the voltage greater than 10 volts?
Yes
GO to BD5.
No
REFER to Steering Column to diagnose the ignition switch. Testing and Inspection
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BD5 CHECK THE SJB INPUT PIDs FROM THE IGNITION SWITCH
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB ignition switch accessory (IGN_A_ECU), off (IGN_O_ECU), run (IGN_R_ECU), and start (IGN_S_ECU) while cycling the ignition switch from ACC to OFF, RUN and START.
- Do the SJB PIDs match the ignition switch position?
Yes
GO to BD6.
No
REFER to Steering Column to diagnose the ignition switch outputs to the SJB. Testing and Inspection
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BD6 RECHECK THE IC DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC Self-Test.
- Clear all DTCs. Repeat the IC self-test.
- Is DTC U2472 still present?
Yes
GO to AAD7.
No
GO to AAD8.
BD7 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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. 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. CLEAR the DTCs. REPEAT the self-test.
BD8 CHECK FOR CORRECT IC OPERATION
- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). 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. CLEAR the DTCs. REPEAT the self-test.
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