Pinpoint Test D: No Power in START

Steering Column Switches

Pinpoint Tests

Pinpoint Test D: No Power in START

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 START position, fused battery voltage is sent to the Smart Junction Box (SJB) along circuit 1522 (DG).

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



PINPOINT TEST D: NO POWER IN START

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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D1 CHECK THE IGNITION SWITCH


- Carry out the Ignition Switch Component Test.

- Is the ignition switch OK?

Yes
GO to D2.

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

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D2 CHECK FOR VOLTAGE AT THE SJB


- Ignition OFF.
- Disconnect: SJB C2280a.
- With the ignition key in the START position, measure the voltage between SJB C2280a-12, circuit 1522 (DG), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to D4.

No
GO to D3.

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D3 CHECK CIRCUIT 1522 (DG) FOR AN OPEN OR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Measure the resistance between:
- SJB C2280a-12, circuit 1522 (DG), harness side and ignition switch C250-7, circuit 1522 (DG), harness side.
- SJB C2280a-12, circuit 1522 (DG), harness side and ground.




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

Yes
GO to D4.

No
REPAIR circuit 1522 (DG). TEST the system for normal operation.

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D4 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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