Pinpoint Test B: No Power In ACC

Steering Column Switches

Pinpoint Tests

Pinpoint Test B: No Power in ACC

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

Normal Operation

The ignition switch ACC circuit provides fused ignition voltage, along circuit CDC33 (VT/GN) to the Smart Junction Box (SJB), when the key is in the ACC position.

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



PINPOINT TEST B: NO POWER IN ACC

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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B1 CHECK CIRCUIT CDC33 (VT/GN) FOR VOLTAGE


- Ignition OFF.
- Disconnect: SJB C2280b.
- Ignition In ACC.
- Measure the voltage between SJB C2280b-4, circuit CDC33 (VT/GN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to B3.

No
GO to B2.

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B2 CHECK CIRCUIT CDC33 (VT/GN) FOR AN OPEN OR SHORT TO GROUND


- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Measure the resistance between:
- ignition switch C250-6, circuit CDC33 (VT/GN), harness side and SJB C2280b-4, circuit CDC33 (VT/GN), harness side.
- ignition switch C250-6, circuit CDC33 (VT/GN), harness side and ground.




- Are the resistances less than 5 ohms between the components and greater than 10,000 ohms to ground?

Yes
GO to B4.

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

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B3 CHECK THE IGNITION SWITCH


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

- Is the ignition switch OK?

Yes
GO to B4.

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

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B4 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. TEST the system for normal operation.

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