Pinpoint Test AZ: DTC U2472
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AZ: DTC U2472
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number
Normal Operation
The Instrument Cluster (IC) receives both the RUN/START and keep alive voltage from the Smart Junction Box (SJB). The IC is grounded through a single hardwired ground.
- DTC U2472 (Unexpected Ignition State) - sets in continuous memory when the IC detects a discrepancy between the hardwired voltage input and the messaged ignition state inputs from the SJB for greater than 5 seconds when the ignition switch is in the RUN position.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- SJB
- IC
PINPOINT TEST AZ: 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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AZ1 CHECK THE IC RUN/START VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: IC C220 .
- Measure the voltage between the IC C220-21, circuit SBP26 (YE/RD), harness side and ground.
- Ignition ON.
- Measure the voltage between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to AZ2.
No
VERIFY the SJB fuses 26 (10A) and 29 (5A) are OK. If OK, REPAIR circuit CBP29 (WH/VT) for an open. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number
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AZ2 CHECK THE SJB INPUT PIDs FROM THE IGNITION SWITCH
- Enter the following diagnostic mode on the scan tool: SJB DataLogger .
- Select the ignition switch ACC (IGN_A_ECU), ignition switch OFF (IGN_O_ECU), ignition switch RUN (IGN_R_ECU), and ignition switch START (IGN_S_ECU) PIDs. Monitor the ignition switch PIDs while cycling the ignition switch from ACC, OFF, RUN and START.
- Do the SJB PIDs match the ignition switch position?
Yes
GO to AZ3.
No
REFER to Steering Column Switches Testing and Inspection to diagnose the ignition switch inputs to the SJB.
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AZ3 CHECK THE IC DTCs
- Enter the following diagnostic mode on the scan tool: IC Self-Test .
- Clear the DTCs. Repeat the IC self-test.
- Is DTC U2472 still present?
Yes
GO to AZ4.
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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AZ4 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. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.
If the concern remains, REINSTALL the original SJB and GO to AZ5.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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AZ5 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.
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