Pinpoint Tests AS: DTC B1363

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AS: DTC B1363

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number

Normal Operation
- DTC B1363 (Ignition Start Circuit Failure) - a continuous memory DTC that sets in the Instrument Cluster (IC) if the IC receives an ignition START message for more than 15 seconds from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Ignition switch
- SJB



PINPOINT TEST AS: DTC B1363

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AS1 CARRY OUT THE IC SELF-TEST


- Enter the following diagnostic mode on the scan tool: IC Self-Test.
- Clear the DTCs. Repeat the IC self-test.
- Is DTC B1363 still present?

Yes
GO to AS2.

No
The system is operating normally at this time. The concern may have resulted from an intermittent network concern.

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AS2 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST


- Check for recorded SJB DTCs from the self-test.
- Are any SJB DTCs recorded?

Yes
REFER to Body Control Systems.

No
GO to AS3.

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AS3 CHECK THE SJB IGNITION SWITCH PID


- Disconnect: Starter Relay.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB ignition switch (IGN_S_ECU) PID with the ignition switch in the START position then in the RUN position.
- Does the PID indicate YES with the ignition in the START position and NO in the RUN position?

Yes
GO to AS6.

No
GO to AS4.

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AS4 CHECK THE IGNITION SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: SJB C2280b.
- Disconnect: Ignition Switch C250.
- Ignition ON.
- Measure the voltage between the ignition switch C250-7, circuit CDC35 (BU/WH), harness side and ground.




- Is any voltage present?

Yes
REPAIR circuit CDC35 (BU/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

No
GO to AS5.

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AS5 CHECK THE IGNITION SWITCH OPERATION


- Ignition OFF.
- Connect: Ignition Switch C250.
- Place the key in the START position.
- Measure the voltage between the SJB C2280b-32, circuit CDC35 (BU/WH), harness side and ground.




- Ignition ON.
- Measure the voltage between the SJB C2280b-32, circuit CDC35 (BU/WH), harness side and ground.




- Is the voltage greater than 10 volts with the ignition switch in the START position then drop to 0 volts with the ignition switch in the RUN position?

Yes
GO to AS6.

No
INSTALL a new ignition switch. REFER to Steering Column. CLEAR the DTCs. REPEAT the self-test.

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AS6 CHECK FOR CORRECT SJB MODULE 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 Body Control Systems. 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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