Normal Operation
WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition key is turned to the RUN or START position, the ignition switch supplies voltage to the PCM and BCM . The BCM then grounds the BJB RUN/START relay control circuit to activate the RUN/START relay. When the relay contacts close voltage is supplied to the PCM through Battery Junction Box (BJB) fuse 53 (5A).
- DTC P2532 (Ignition Switch Run Position Circuit High) -- sets when the PCM detects a voltage from the ACC/RUN bus when the ignition key is not in the START or RUN position.
- DTC P2535 (Ignition Switch Run/Start Position Circuit High) -- sets when the PCM detects a voltage from the RUN/START bus when the ignition key is not in the START or RUN position.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Starter relay
- BJB
- BCM
- PCM