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 in the RUN position, voltage is provided to Battery Junction Box (BJB) fuses 38 (10A) and 39 (10A) along circuit CDC34 (WH/OG). Voltage is also sent to the Smart Junction Box (SJB) microprocessor and the SJB run/start bus along circuit CDC34 (WH/OG).

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 FOR VOLTAGE TO THE SJB


- Ignition OFF.
- Disconnect: SJB C2280b.
- Disconnect: SJB C2280e.
- Disconnect: BJB Fuse 38 (10A).
- Disconnect: BJB Fuse 39 (10A).
- Ignition ON.
- Measure the voltage between ground and:
- SJB C2280b-45, circuit CDC34 (WH/OG), harness side.
- SJB C2280e-1, circuit CDC34 (WH/OG), harness side.
- BJB fuse 38 (10A), circuit CDC34 (WH/OG), input side.
- BJB fuse 39 (10A), circuit CDC34 (WH/OG), input side.




- Are the voltages greater than 10 volts?

Yes
GO to C5.

No
GO to C2.

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C2 CHECK CIRCUIT CDC34 (WH/OG) FOR AN OPEN


- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and:
- SJB C2280b-45, circuit CDC34 (WH/OG), harness side.
- SJB C2280e-1, circuit CDC34 (WH/OG), harness side.
- BJB fuse 38 (10A), circuit CDC34 (WH/OG), input side.
- BJB fuse 39 (10A), circuit CDC34 (WH/OG), input side.




- Are the resistances less than 5 ohms?

Yes
GO to C3.

No
REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.

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C3 CHECK CIRCUIT CDC34 (WH/OG) FOR A SHORT TO GROUND


- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to C4.

No
REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.

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C4 ISOLATE THE IGNITION SWITCH


- Ignition ON.
- Measure the resistance between ignition switch C250 pin-4, component side and ignition switch C250 pin-1, component side.
- Is the resistance less than 5 ohms?

Yes
GO to C5.

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

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C5 CHECK FOR CORRECT SJB OPERATION


- Check SJB C2280b and C2280e for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect the SJB connectors and make sure they are seated correctly.
- 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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