U300A:62
Instrumentation, Message Center and Warning Chimes
Pinpoint Test BZ: DTC U300A:62 Or U300A:64
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. [1][2]Diagrams By Number
Normal Operation
With the ignition switch in the START or RUN position, the Instrument Panel Cluster (IPC) receives a RUN/START voltage input from the Smart Junction Box (SJB). The IPC (Instrument Panel Cluster) also receives a networked ignition status from the SJB (Smart Junction Box) over the Medium Speed Controller Area Network (MS-CAN) communication bus.
- DTC U300A:62 (Ignition Switch: Signal Compare Failure)- the IPC (Instrument Panel Cluster) compares the networked input with the hardwired input and sets DTC U300A:62 in continuous memory and on-demand if a discrepancy is detected.
- DTC U300A:64 (Ignition Switch: Signal Plausibility Failure)- the IPC (Instrument Panel Cluster) monitors the messaged START status and sets DTC U300A:64 in continuous memory and on-demand if the IPC (Instrument Panel Cluster) detects a START input for 15 seconds. Once the fault condition is detected, the IPC (Instrument Panel Cluster) retains limited functionality for 15 seconds then returns to full functionality.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- SJB (Smart Junction Box)
- IPC (Instrument Panel Cluster)
PINPOINT TEST BZ : DTC U300A:62 OR U300A:64
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
BZ1 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST
- Check for recorded DTCs from the IPC (Instrument Panel Cluster) self-test.
Is DTC U300A:62 recorded?
Yes
GO to BZ2.
No
GO to BZ3.
BZ2 CHECK THE IPC (Instrument Panel Cluster) VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: IPC (Instrument Panel Cluster) C220.
- Measure the voltage between the IPC (Instrument Panel Cluster) C220-20, circuit CBP29 (WH/VT), harness side and the IPC (Instrument Panel Cluster) C220-5, circuit GD116 (BK/VT), harness side.
- Ignition ON.
- Measure the voltage between the IPC (Instrument Panel Cluster) C220-20, circuit CBP29 (WH/VT), harness side and the IPC (Instrument Panel Cluster) C220-5, circuit GD116 (BK/VT), harness side.
- Place the ignition in the START position.
- Measure the voltage between the IPC (Instrument Panel Cluster) C220-20, circuit CBP29 (WH/VT), harness side and the IPC (Instrument Panel Cluster) C220-5, circuit GD116 (BK/VT), harness side.
Is the voltage 0 volts in the OFF position and greater than 10 volts in the RUN and START positions?
Yes
GO to BZ3.
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. [1][2]Diagrams By Number
BZ3 CHECK THE SJB (Smart Junction Box) INPUT PIDs FROM THE IGNITION SWITCH
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB (Smart Junction Box) DataLogger.
- Select the SJB (Smart Junction Box) PIDs ignition ACC (IGN_A_ECU), ignition OFF (IGN_O_ECU), ignition RUN (IGN_R_ECU), and ignition START (IGN_S_ECU). Monitor the ignition PIDs while switching the ignition from ACC, OFF, RUN and START.
Do the SJB (Smart Junction Box) PIDs match the ignition mode?
Yes
GO to BZ4.
No
REFER to Steering Column to diagnose the ignition outputs to the SJB (Smart Junction Box).
BZ4 CHECK THE IPC (Instrument Panel Cluster) DTCs
- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) Self-Test.
- Repeat the IPC (Instrument Panel Cluster) self-test. Clear the DTCs.
Is DTC U300A:62 or DTC U300A:64 still present?
Yes
INSTALL a new SJB (Smart Junction Box). CLEAR the DTCs. REPEAT the self-test.
If the DTC is still present, INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.
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.