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

The ignition switch START circuit provides fused ignition voltage, along circuit CDC35 (BU/WH) to the Smart Junction Box (SJB), when the key is in the START position.

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 CIRCUIT CDC35 (BU/WH) FOR VOLTAGE


- Ignition OFF.
- Disconnect: SJB C2280b.
- With the ignition key in the START position, measure the voltage between SJB C2280b-30, circuit CDC35 (BU/WH), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to D3.

No
GO to D2.

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D2 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN OR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Measure the resistance between:
- ignition switch C250-7, circuit CDC35 (BU/WH), harness side and SJB C2280b-30, circuit CDC35 (BU/WH), harness side.
- SJB C2280b-30, circuit CDC35 (BU/WH), 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 SJB and ground?

Yes
GO to D3.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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D3 CHECK FOR CORRECT SJB OPERATION


- Inspect 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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