Pinpoint Test C: No Power in RUN

Steering Column Switches

Pinpoint Tests

Pinpoint Test C: No Power in RUN

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

Normal Operation

When the ignition switch is turned to the RUN position, fused battery voltage is sent to the Smart Junction Box (SJB) along circuit 1044 (WH/YE).

- DTC B1356 Ignition RUN Circuit Open - If during the on-demand self test the SJB does not receive the RUN input from the ignition switch or if the ignition switch position cannot be determined, DTC B1356 will be set.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ignition switch
- SJB



PINPOINT TEST C: NO POWER IN RUN

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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C1 CHECK THE IGNITION SWITCH


- Carry out the Ignition Switch Component Test.

- Is the ignition switch OK?

Yes
GO to C2.

No
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. TEST the system for normal operation.

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C2 CHECK FOR VOLTAGE AT THE SJB


- Ignition OFF.
- Disconnect: SJB C2280a.
- Ignition ON.
- Measure the voltage between SJB C2280a-36, circuit 1044 (WH/YE), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to C4.

No
GO to C3.

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C3 CHECK CIRCUIT 1044 (WH/YE) FOR AN OPEN OR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Measure the resistance between:
- SJB C2280a-36, circuit 1044 (WH/YE), harness side and ignition switch C250-1, circuit 1044 (WH/YE), harness side.
- SJB C2280a-36, circuit 1044 (WH/YE), harness side, and ground.




- Are the resistances less than 5 ohms between the SJB and the ignition switch, and greater than 10,000 ohms between the SJB and ground?

Yes
GO to C4.

No
REPAIR circuit 1044 (WH/YE). TEST the system for normal operation.

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C4 CHECK FOR CORRECT SJB OPERATION


- Ignition OFF.
- Check SJB C2280a for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: SJB C2280a.
- Make sure the connector seats correctly, then operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. REPEAT the self-test.

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

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