Pinpoint Test A: No Power in All Ignition Switch Positions

Steering Column Switches

Pinpoint Test A: No Power in All Ignition Switch Positions

Refer to Wiring Diagrams Set 13, Power Distribution for schematic and connector information. Electrical Diagrams

Normal Operation

The ignition switch receives fused battery voltage from Battery Junction Box (BJB) fuse 7 (20A). The ignition switch then sends that voltage out to the Central Junction Box (CJB) and the BJB (Battery Junction Box) depending on ignition switch position. 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

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.

A1 CHECK THE VOLTAGE TO THE IGNITION SWITCH

- Disconnect: Ignition Switch C250.

- Measure the voltage between the ignition switch C250-4, circuit 30-BB9 (RD), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to A2.

No
VERIFY BJB (Battery Junction Box) fuse 7 (20A) is OK. If OK, REPAIR circuit 30-BB9 (RD). If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Electrical Diagrams

A2 CHECK THE IGNITION SWITCH

- Carry out the Ignition Switch component test.

Did the ignition switch pass the component test?

Yes
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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