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

The ignition switch RUN circuit provides fused ignition voltage, along circuit CDC34 (WH/OG) to the Smart Junction Box (SJB), when the key is in the RUN position.

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 CIRCUIT CDC34 (WH/OG) FOR VOLTAGE


- Ignition OFF.
- Disconnect: SJB C2280b.
- Ignition ON.
- Measure the voltage between SJB C2280b-29, circuit CDC34 (WH/OG), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to C3.

No
GO to C2.

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C2 CHECK CIRCUIT CDC34 (WH/OG) FOR AN OPEN OR SHORT TO GROUND


- Ignition OFF.
- Disconnect: SJB C2280b.
- Disconnect: Ignition Switch C250.
- Measure the resistance between:
- ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB C2280b-29, circuit CDC34 (WH/OG), harness side.
- ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.




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

Yes
GO to C3.

No
REPAIR the circuit. TEST the system for normal operation.

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C3 CHECK THE IGNITION SWITCH


- Disconnect: Ignition Switch C250.
- Carry out the Ignition Switch Component Test. Component Tests and General Diagnostics

- Is the ignition switch OK?

Yes
GO to C4.

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

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C4 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. REFER to Body Control Systems.

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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