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 from Battery Junction Box (BJB) fuse 14 (15A) along circuit SBB14 (BN/RD). The ignition switch has 4 possible states:

- OFF
- ACC
- RUN
- START

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



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.

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A1 CHECK FOR VOLTAGE AT THE IGNITION SWITCH


- Disconnect: Ignition Switch C250.
- Measure the voltage between ignition switch C250-4, circuit SBB14 (BN/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 that BJB fuse 14 (15A) is OK. If OK, GO to A2 .

If the fuse is not OK, REPAIR the BJB or circuit SBB14 (BN/RD) as necessary. INSTALL a new fuse. TEST the system for normal operation.

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A2 CHECK CIRCUIT SBB14 (BN/RD) FOR AN OPEN


- Disconnect: BJB Fuse 14 (15A).
- Measure the resistance between ignition switch C250-4, circuit SBB14 (BN/RD), harness side and BJB fuse 14 (15A), circuit SBB14 (BN/RD), output side.




- Is the resistance less than 5 ohms?

Yes
REPAIR or INSTALL a new BJB. TEST the system for normal operation.

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

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