Normal Operation

The ignition switch receives fused battery voltage from Body Control Module (BCM) fuse 28 (15A). In the ACC or ON position, this voltage is sent to the BCM  . In the START position, this voltage is sent to both the BCM  and the PCM.

When the ignition switch is cycled to the OFF/LOCK position from any other position the BCM  begins a monitoring cycle. The monitoring cycle checks that the voltage supplied to the BCM  from the ignition switch through the RUN/ACC, RUN/START and START circuits is delivered correctly for each ignition switch position.

• DTC U300A:01 (Ignition Switch: General Electric Failure) - The BCM  continuously monitors the ignition switch position. This DTC sets if the voltage inputs to the BCM  do not match the pre defined configurations for each ignition switch position.

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• Ignition switch