Pinpoint Test A: No Power In All Ignition Switch Positions

Steering Column Switches

Pinpoint Tests

Pinpoint Test A: No Power in All Ignition Switch Positions

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

Normal Operation

The ignition switch receives fused battery voltage along circuit SBP27 (BU/RD) from Smart Junction Box (SJB) fuse 27 (20A). The ignition switch then sends that voltage out to various systems depending on ignition switch position. The ignition switch has 4 possible states:

- OFF - No power on any circuits
- ACC - Power on circuit CDC33 (VT/GN)
- RUN - Power on circuit CDC34 (WH/OG)
- START - Power on circuit CDC35 (BU/WH)

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



PINPOINT TEST A: NO POWER IN ALL IGNITION SWITCH POSITIONS

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

NOTE: Verify that battery voltage is 10 volts or greater.

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A1 CHECK FOR VOLTAGE AT SJB FUSE 27 (20A)


- Ignition OFF.
- Disconnect: SJB Fuse 27 (20A).
- Measure the voltage between SJB fuse 27 (20A), input side and ground.
- Is the voltage greater than 10 volts?

Yes
GO to A2.

No
GO to A3.

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A2 CHECK FOR VOLTAGE ON CIRCUIT SBP27 (BU/RD)


- Connect: SJB Fuse 27 (20A).
- Disconnect: Ignition Switch C250.
- Measure the voltage between ignition switch C250-4, circuit SBP27 (BU/RD), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. TEST the system for normal operation.

No
VERIFY SJB fuse 27 (20A) is OK. If OK, REPAIR circuit SBP27 (BU/RD). If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
TEST the system for normal operation.

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A3 CHECK FOR CORRECT SJB OPERATION


- Disconnect: SJB C2280A.
- Disconnect: SJB C2280B.
- Check the SJB connectors for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: SJB C2280A.
- Connect: SJB C2280B.
- Make sure the connectors seat correctly, then 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. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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